1. home and garden
2. home improvement and repair
3. roofing

VOL 16.3 APRIL/MAY 2015 R38 incl. VAT
FOR The InFORMed ARchITecT
Roofing that
cuRves & cRanks easily
• Interiors enters green era • 15 ingenious ceilings
• Latest international tile trends & technologies
IN THIS ISSUE
journal 3 • april/may 2015
Regulars
features
trend hunter
tiles, adhesives &
6
Easy fix for mosaic
waterproofing
installations
14FEATURE: Tile fashion that
7
8
Zinc finishes for interior
inspire a trend update from
applications
Revestir & Cevisama
Fun, but technical mirror
24
installation
Bringing global tile décor
to SA
green design
sustainable cement &
12
The flying gardens of
concrete
Frankfurt
26
FEATURE:
A solid case for concrete
15 ideas in 2015
and cement in green
74
buildings
Ingenious ceilings
32Reusable concrete elements
technical solutions &
vital for sustainability
projects
88
Architecture as a living
green buildings
machine
36
FEATURE: Launching a new
era for interior architecture
industry update
93
Roadshow delights architects
94New store openings benefit
Roofing & ceilings
42FEATURE: Movable roof –
local communities
96
Architectural specifier joins
tile producer
a modern marvel
56 Zinc profile enables striking
roof designs
58 Why do roof trusses fail?
64 Multipurpose ceiling boards
in a size that makes sense
ed ’s note
Scan here to check out this
year’s architecturally
inspired films.
YOUR FREE GUIDE
TO ALL WALLING,
FLOORING & ROOFING
INFORMATION
Join our community NOW!
Marlene van Rooyen,
Editor
I n t e r i o r r at i n g to o l s e t
c h a n g e m at e r i a l s e l e c t i o n
to
The newly piloted Green Star SA Interiors rating tool,
launched in February, is set to establish a new benchmark
in the specification of interior products. According to some,
manufacturers will be challenged to provide benchmarking
of so-called “green” products through certification of their
products by third party certification systems. This will take a
lot of the guess work out of the product selection process.
The importance of this is growing: according to one specifier,
manufacturers that don’t have a green certification could
eventually be squeezed out of the market. We investigate the
changes in team dynamics and how improved air quality can
directly influence productivity. Everything you need to know,
you can read about from page 34.
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website www.wallsandroofs.co.za
w w w. w a l l s a n d ro of s . c o . z a TREND H UN T ER
publisher:
Editor:
'
8
Media in Africa (Pty) Ltd
Marlene van Rooyen
083 327 3746
[email protected]
excellence
15 years of
@marlene_rooyen
publishing Manager:
Liezel van der Merwe
o n t h e co v e r
@Liezel_vdm
Founder:
Schalk Burger (1943 – 2006)
Financial director:
Fanie Venter
Financial manager:
Gerda Cowley
Estate in Midrand features Global Roofing Solutions’ Klip-Tite
Zuerita Gouws
roofing profile, rolled in 0,58mm Chromadek Charcoal. The
[email protected]
surface area covered totalled 26 200m².
business unit coordinator:
8
advertising manager:
'
8
Designer:
8
Journalist:
The Cell C head office and warehouse in the Waterfall Business
One of the specific requirements, and challenges of the
Shayne Lessing
project, was the uniquely shaped, curved roof of the Cell C
082 945 5030
[email protected]
Ilze Pöhl
warehouse. In order to successfully create this remarkable
design, the roof sheeting had to be bull-nosed, cranked and
curved. This was done successfully without any resulting
[email protected]
Alet van der Merwe
failures or leaks.
The warehouse was designed by Empowered Spaces
proofreader:
Elizabeth Botha
Architects and the roofing contractor was Tate & Nicholson,
reception:
Lizzy Mathibela
part of Southy Holdings.
reproduction & printing:
Business Print Centre
See page 46 for more on this project.
Contact information:
International: Tel +27 12 347 7530
Fax: +27 12 347 7523
E-mail: [email protected]
www.wallsandroofs.co.za • www.mediainafrica.co.za
www.freemagazine.co.za
Facebook: www.facebook.com/buildinganddecor
Twitter: @BuildingDecor
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Cnr Nossob & Swakop Streets, Erasmuskloof Ext. 3
Reasonable care is taken to ensure that articles and other information in this issue are up to date and as accurate as possible at the time of publication, but no
responsibility can be taken by WALLS & ROOFS in Africa or Media in Africa for any
errors or omissions contained herein. Furthermore, responsibility for any losses,
damages or distress resulting from adherence to any information made available
in this magazine is not the responsibility of WALLS & ROOFS in Africa or Media in
Africa. The opinions expressed are those of the authors and do not necessarily
reflect the views of the publisher. WALLS & ROOFS in Africa or Media in Africa
cannot be held responsible for inaccuracies in colour reproduction. We try our
utmost to represent the colours correctly, but due to the printing process, colour
variations may occur. The publishers accept no responsibility for magazines that
are either damaged or not received by subscribers due to postal error.
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Established in 1983
4
Jo u rn al 3 • Apr i l/May 2 0 15
TAKE
ERE!
YWH
IT AN
w w w. w a l l s a n d ro of s . c o . z a TR END HUNTER
i n t e r i o r r at i n g to o l
mosaic fix
Following a successful pilot programme, the Green Building
To ensure perfect mosaic installations, the Douglas Jones
Council of South Africa (GBCSA) has launched its new Green
Mosaic Fix was designed with anti-slip properties. This quick-
Star SA Interiors Tool to encourage the reduced environmental
setting adhesive has a low-dust formulation, is easy to mix
impact of interior projects.
and apply, and comes in white and grey cement.
Website: www.gbcsa.com
Website: www.douglasjones.co.za
Bring the outside in
The Rheinzink Interior Line can be applied as ceiling or wall
claddings, backgrounds to shelf displays and statement
features in two colour variants, blue-grey and graphitegrey, and also as extensions of facades and roofs.
Website: www.rheinzink.co.za
M u lt i p u r p o s e
c e i l i n g b oa r d s
An industry first, the 8mm thick by 1m wide plasterboard
offers a truly metric alternative to the 900mm and 1
200mm wide boards, derived from 3ft and 4ft imperial
measurements.
Website: www.pelican.co.za
new l abels on
a d h e s i v e pa c k a g i n g
To simplify selection for the end-user and tiling contractor, TAL has introduced
new labels on its 20kg bags of several products in its rapid-set, quick-set as
well as standard-set adhesives ranges.
Website: www.tal.co.za
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
5
TREND H UN T ER
Easy fix
for mosaic
install ations
Since its inception 15 years ago, Douglas Jones has kept
abreast of the ever changing needs in the building industry.
In one of its latest innovations, Douglas Jones has teamed up
with Weber-Tylon, an international manufacturer and supplier
of quality adhesives, to develop the Douglas Jones Mosaic-fix
to ensure flawless mosaic installations.
“Mosaics are very different from normal tiles in that they
generate more movement and therefore need a quick-setting,
high-tensile strength adhesive which has the ability to absorb
the additional movement of the sheets,” explains marketing
director, Kitty Douglas-Jones.
Island Stone
To address this requirement, the Douglas Jones Mosaicfix is a premium product designed with anti-slip properties to
provide a perfect installation and ultimate peace of mind. With
its low-dust formulation, the mosaic fix is easy to mix, easy to
apply and fast setting (six hours), which affords installation in
a shorter period and in turn, saves both time and money. It is
available in white and grey cement.
Douglas Jones
Tel: 021 706 7251
Website: www.douglasjones.co.za
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Jo u rn al 3 • Apr i l/May 2 0 15
w w w. w a l l s a n d ro of s . c o . z a TR END HUNTER
Zinc finishes
for interior
applications
Completing strong, impressive interior designs,
the Rheinzink Interieur Line was created to provide
interior designers and architects with striking
statement options.
ith
ered
pre-weathsurfaces
in two timeless
colour variants,
blue-grey and graphitegrey, this finish can be
applied in various ways to
interior walls or ceilings
in hotels, company foyers, residential projects
and more. It can also be
used as a design element
in furniture construction.
M a k i n g a s tat e m e n t
“Countless possibilities exist for interior spaces to express
certain personalities,” says Stephen Wilkinson, business
manager at Rheinzink South Africa.
“An entrance area or stairway can become a mise-enscène, a wall design can be given infinite depth or a room
feature can be transformed into a visual highlight.”
In
shopping
malls
and
showrooms,
interior
1. Rheinzink applied to create an interior highlight at Aula Magna in
Stockholm.
design plays a big role in developing store concepts.
2. The Rheinzink façade is extended to the interior of the building.
The Rheinzink Interieur Line provides fascinating design
3. A Rheinzink feature wall.
opportunities as colour variations for walls and ceilings,
cladding to stairways, backgrounds to shelf displays or room
dividers.
“Opting for the Rheinzink Interieur Line opens up
new horizons because it can also be used as a harmonious
extension to Rheinzink facades and roof areas. When the
outdoors become indoors, boundaries disappear and inspiring
perspectives are revealed,” Wilkinson adds.
M at e r i a l f e at u r e s
The transparent coating, which preserves the preweathered surface, also serves as protection against userelated impacts which heavily frequented rooms are often
subjected to.
Rheinzink is extremely durable and keeps its good looks
for years, even decades. A maintenance-free material with
excellent cleaning characteristics, dirt can simply be wiped
away when necessary.
Rheinzink
The Rheinzink material has exceptional shaping characteristics
Tel: 021 671 2600
and an extremely wide range of laying techniques, which
Email: [email protected]
allow for unlimited design possibilities.
Website: www.rheinzink.co.za
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
7
TREND H UN T ER
Fun, but
technical
mirror
install ation
Despite very short deadlines and restricted working
hours, AluGro (Pty) Ltd successfully supplied and
installed 4mm thick, Grey Images Mirrors for
The Fun Company in the Menlyn Shopping Centre
in Pretoria within only a week’s time.
he 50m² installation was part of the shop fitting for
the new family entertainment centre. Having already
opened its doors for business, most of the work had
to be done after hours to cause minimal disruption
in the store.
According to Wessel Smuts, operations manager at
AluGro is one of the only companies in South Africa that manufactures arched
windows and doors.
special cut-outs
had to be made to avoid
joints around the counter
and power skirting
AluGro, it was quite a challenging project due to the time limits
and design requirements. Also because this type of mirror is
not commonly specified, it had to be ordered specially for this
project on a few days’ notice.
“Due to the short deadline, the client opted for a wooden
structure instead of aluminium, which tested our skills since
wood is not always straight,” Smuts explains. “The mirrors
therefore had to be re-worked after cutting to follow the
shape of the wood.
“In addition, to achieve a one-piece wall mirror and get
a seamless fit from top to bottom and side to side, jumbo size
mirrors were required and special cut-outs had to be made to
avoid joints around the counter and power skirting,” he says.
However, AluGro finished the project on time and
according to the design. “The end-result is stunning – the
designer really did a great job with an excellent design,”
Smuts adds.
AluGro
Tel: 0861 ALUGRO / 012 804 4129
The seamless mirror feature in The Fun Company’s new Menlyn store,
installed by Alugro.
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Jo u rn al 3 • Apr i l/May 2 0 15
Website: alugro.co.za
w w w. w a l l s a n d ro of s . c o . z a TR END HUNTER
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
9
GREEN DESI GN
The Flying Garden Tower. © COOP HIMMELB(L)AU
The flying gardens
of Frankfurt
In one of the latest developments in sustainable building design, Austrian
architectural firm Coop Himmelb(l)au’s Flying Garden Tower proposal has been
selected for the Gateway Gardens urban district development.
he design features a tall polygonal tower with hanging
greenery that brings nature directly into the space.
Forming part of the Frankfurt Airport City in
Germany, the Gateway Gardens district is planned to be
a first-class urban node featuring modern architecture and
plenty of soothing foliage to provide a fresh stimulus to the
region.
The Flying Garden Tower’s elliptic shape and orientation have
been calculated to optimise the building’s environmental
efficiency.
The east and west facades, which are subject to high
solar exposure, are protected by the buffer zone of the atriums
as tall as the building itself with suspended “flying” gardens.
Envisioned as a commercial landmark housing many
The north- and south-facing facades are optimally aligned in
corporate companies in one of Europe’s main transportation
terms of office energy efficiency and were designed to enable
hubs, the Flying Garden Tower’s striking polygonal profile will
flexible and adaptable spatial layouts.
be easily recognisable from its surrounds. Standing 67 metres
tall, the building will be highly visible from any part of the
airport and nearby roads, as well as from the air.
12
E n v i r o n m e n ta l e f f i c i e n c y
Jo u rn al 3 • Apr i l/May 2 0 15
This synergy between architecture and energy design
answers the specific requirements of the Gateway Gardens
w w w. w a l l s a n d ro of s . c o . z a GR EEN DESIGN
The Flying Garden Tower’s
elliptic shape and
orientation have been
calculated to optimise the
building’s environmental
efficiency.
master plan. Instead of cramming in maximum
development, it envisages generously spaced open
areas with intertwined green elements, allowing its
occupants to experience nature in a direct way.
Full thanks and acknowledgment are given to
Coop Himmelb(l)au and Frankfurt Airport for the
information given to write this article.
A model representation of the polygonal tower.
© Markus Pillhofer
Project data
Site area: 10 300m²
Gross floor area: 33 100m²
Net floor area: 30 120m²
Building height: 67m
Number of floors: 18
Scan here to visit Coop Himmelb(l)au’s
website.
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
13
F e at u r e
tiles, adhesives & waterproofing
Tile fashion that inspire
A trend update from revestir & cevisama
With a diversity of attractions, high-level content and trends, as well
as a record number of attendees at Expo Revestir 2015, it is clear that
the finishing sector is still intent on producing innovative and creative
products and designs.
howcasing the newest developments in technology and the latest design trends,
the Cevisama Tile Fair in Valencia and Expo Revestir, held only about a month
apart, again served to inspire professionals in the built environment to come up
with imaginative and sustainable applications.
WALLS & ROOFS’ Zuerita Gouws was at Expo Revestir to personally experience the
extended range of styles, shapes, colours and materials and to explore the emerging
trends for this year and moving forward.
“Texture was everywhere,” she points out. “Although wood and stone are not
new trends, but rather feature as part of other new ideas, it was striking how every
wood, stone or brick finish so closely matches the real thing, not only in looks, but also
in touch. Inspired by that which occurs naturally, designs and colours depicted raw
finishes such as rust, natural wood grains, unfinished and even weathered timber.
“In terms of colour, most collections feature earthy and light neutral tones with
splashes of bright tints here and there, especially when it comes to mosaic, patchwork
and patterned tiles,” she says.
According to Gouws, unusual shapes and patterns were also very popular, often
combined with 3D effects and special cuts to create eye-catching feature walls that
encourage visual motion. Honeycomb layouts are still prevalent and are applied using
combinations of different colours and eclectic patchwork themes.
Tetris: 3D puzzle pieces.
Courtesy of Palazzo
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Jo u rn al 3 • Apr i l/May 2 0 15
These patchwork designs are often printed on large format tiles, mixing many
different patterns and shapes on bigger sized tiles to create a mosaic feel. Printed
tiles are gaining ground also featuring detailed designs, metallic outlines, artistic
expressions and other graphics. In addition, the flooring side especially showed a
big focus on respect for nature with many alternative materials, such as the reuse of
fluorescent glass lamps, TV screens, computer monitors, rubber and ceramic waste
used in the manufacturing of floors and covers.
continues on p16
www.wa lls a n droof s . co . z a
tiles, adhesives & waterproofing
F e at u r e
unusual shapes and patterns were
also very popular, often combined
with 3D effects and special cuts
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
15
tiles, ad h esi ves & wat er p r o of i n g
continued from p14
3D puzzle pieces
Combining unusual shapes and patterns
with 3D effects, new collections display
mazes of linking lines and jigsaw profiles,
as well as cut-outs and cavities in wall
tiles to create intriguing looks.
Colour highlights and 3D cut-outs such as these red patterned dots make for an interesting
feature wall. Courtesy of Castelatto
Mezzo: a 3D geometric pattern. Courtesy of Palazzo
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Jo u rn al 3 • Apr i l/May 2 0 15
w w w. w a l l s a n d ro of s . c o . z a til es, ad hesiv es & water pr oofing
The weathering steel look creates a rustic feel.
Courtesy ViaRosa
Coffee Kit: A variety of pieces that create a harmonious design. Courtesy of Portinari
Wi l d s p i r i t
Inspired
by
earth,
timber,
water,
stone and metal in its most primitive
appearances, this trend sees tiles
manufactured from biomaterials, as
well as effects such as oxidised metal,
weathered wood and green walls.
E c l e c t i c way
Mixing patterns, styles and eras, this
trend often exudes splashes of colours
that make for interesting focus walls or
highlights.
Geometrical dreams
The hexagon tile trend is updated and
enhanced through the use of multiple
colours and mixed patterns.
Firenze: Honeycomb layout in earthy colour tones. Courtesy of Palazzo
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
17
tiles, ad h esi ves & wat er p r o of i n g
N e o s to n e a g e
Still on trend, cement and stone
finishes,
more
natural-looking
than ever, are created on ultralarge formats with new effects.
Strong urban stone colours reflect the grandeur of this exterior. Courtesy Elaine
Urbano: The precast concrete look, even containing cladding holes.
Courtesy of Palazzo
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Jo u rn al 3 • Apr i l/May 2 0 15
Coloured in shades beyond the classic grey stone, the cement aesthetic comes
alive, highlighted further by the 3D effect. Courtesy Portinari
w w w. w a l l s a n d ro of s . c o . z a til es, ad hesiv es & water pr oofing
Other highlights:
Blue Jeans:
A denim mosaic.
Courtesy of Colormix
Bourdeaux: Raised,
glass-coated blocks
on a single tile.
Courtesy of Colormix
Bourse: Inspired by
the bistro theme.
Courtesy of Colormix
Marsala-coloured brick tiles. Courtesy of Brick Studio
Bi g o n b r i c k s
Closely resembling the real look and texture, brick tiles
come in a variety of colours and sizes.
Lille: A mix of
different prints coated
with translucent
glass reliefs.
Courtesy of Colormix
Caramello: Inspired
by various fashion
prints and materials.
Courtesy of Colormix
Cannon Brilliant:
A marble and
glass mosaic with
crystal accents.
Courtesy of Colormix
Metallics allow
for glamorous,
luxurious looks, from
highly reflective
to more matt or
textured effects.
Courtesy of Versace
Using full HD digital decoration technology, both the
brick look and texture are achieved. Courtesy ViaRosa
Scan here for the full gallery.
Full thanks and acknowledgement are given to Expo Revestir,
Tile of Spain and Cevisama.
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
19
tiles, ad h esi ves & wat er p r o of i n g
Part of the Chryso Southern Africa
Group, a.b.e. Construction Chemicals
is making headway in Botswana
through its distributors, Material
Testing Services (MTS), after its Index
VIS P polymer-bitumen membranes
and VIP Polyurea waterproofing
products were selected for several
major developments in Botswana.
Above: The Fairscape Precinct in Gaborone.
local chemical company
seals botswana building
These include:
• Fairscape Precinct.
• FNB Head Office “First Place”.
• City Scapes Phase I & II (6 400m²).
• Botswana Innovation Hub (39 500m²).
• Botswana Unified Revenue Services (BURS) head office
(8 500m²).
• Game City Shopping Centre extension (22 500 m²).
The Fairscape Precinct in Gaborone.
20
“Over 25 000m² of already
completed
projects
were
protected
with
a.b.e.’s
waterproofing systems, using
Index VIS P membrane in 3mm
and 4mm thicknesses,” says
Grant Batty, a.b.e. sales manager
for construction in Greater
Gauteng. “a.b.e’s silvakote, which
waterproofs concrete, bitumen,
as well as galvanised and other
metal surfaces, was also applied
to large areas of the completed
works,” Batty states.
Jo u rn al 3 • Apr i l/May 2 0 15
a.b.e.-registered and approved applicators, Hiremore
Civils, an MTS Group company, is currently applying a.b.e.’s
abeplate dry-shake, metallic-aggregate surface hardener to 16
875m² of parking deck under the new BURS building to provide
maximum abrasion resistance and impact protection to the heavy
traffic areas.
Also part of the range of products specified in Botswana
is a.b.e.’s:
• Complete range of joint sealants, applied internally and
externally to both decks and walls.
• Epoxy and cementitious grouting and repair mortar
systems.
• Epoxy flooring and coating systems.
• Abedrain, a high density polyethylene (HDPE) protection
membrane for subsoil application.
• a.b.e’s duraflex, a ready-to-use, self-curing, waterproofing
slurry comprising special synthetic resins and a blend of
selected cements and graded aggregates.
a.b.e Construction Chemicals
Tel: 011 306 9000
Website: www.abe.co.za
w w w. w a l l s a n d ro of s . c o . z a til es, ad hesiv es & water pr oofing
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
21
tiles, ad h esi ves & wat er p r o of i n g
the trend:
residential
Quiver Ash
Moyo Pier Rust
Johnson Tiles • Tel: 011 206 9700 • Website: www.johnsontiles.co.za
22
Jo u rn al 3 • Apr i l/May 2 0 15
w w w. w a l l s a n d ro of s . c o . z a til es, ad hesiv es & water pr oofing
Metro Bevelle
Black
www. wa l l s an d ro of s . c o.za
Nostalgia Bone
Deluxe Mist
J ou rn a l 3 • April/Ma y 201 5
Crete Bone
23
tiles, ad h esi ves & wat er p r o of i n g
Bestile Toscana.
Bringing global
tile décor to SA
ccording to marketing director, Kitty Douglas-Jones,
exclusive distribution rights to bring this stunning range into
one of the most apparent trends is towards hexagonal
the market,” she says.
and geometric designs being used in both the corporate and domestic spheres. Applications include a variety of colours, product materials and textures.
Having recognised a need for mosaic, décor and tile
accent products, Douglas Jones was established in 1999 with
a clear mission to service this gap in the market. Focusing
“However, a firm favourite worldwide will always be the
on finding unique, fashionable and inspiring mosaic and
natural stone pebble look,” she points out. “We have sourced
decorative tiles, the company imports products from all over
a top international supplier, Island Stone, which afforded us
the world and mirrors the taste of international interior design
studios and architectural firms alike.
In its Uniquely South African production department,
also known as the Creative Assembly, designers concentrate on
creating bespoke patterns, fades and mixes, with the client’s
imagination being the only limitation. “This department sets
us apart from our competitors as we have an infrastructure of
more than 20 people dedicated to making up these unique
projects,” Douglas-Jones states.
This year, the company celebrates its 15th year of trade
in the tile industry, and will have many different promotions
and give-aways during the year. Look out for its EST99 logo
on various gifts and promotional items. As the company has
branched out to include decorative tiles, its slogan has also
been amended to “Douglas Jones – the tile décor collection”.
Douglas Jones
Tel: 021 706 7251
Island Stone
24
Jo u rn al 3 • Apr i l/May 2 0 15
Website: www.douglasjones.co.za
w w w. w a l l s a n d ro of s . c o . z a til es, ad hesiv es & water pr oofing
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
25
F e at u r e
sustainable cement & concrete
a solid case for concrete and cement
in green buildings
Concrete is the second-most used commodity in the world, after
water, and while the worldwide average consumption of concrete
is about one ton per year per person, despite its extensive use, the
global cement industry only accounts for about 5% of man-made
carbon dioxide emissions.
“
eople often refer to the high CO₂ emissions of cement, but one must
keep in mind that structures are not built out of cement; it is but one
ingredient of the concrete used for construction,” states Bryan Perrie,
managing director of the Concrete Institute.
“In addition, cement companies are continuously working to reduce
their carbon footprints in the manufacturing of cement and concrete by using
alternative fuels in cement kilns and reducing the clinker ratio in cement, using
cement extenders like ground granulated blastfurnace slag (GGBS), fly-ash and
limestone,” he says.
Cement extenders
Johan van Wyk, a concrete technologist and general manager of the Southern
Africa Readymix Association (SARMA), explains that extenders only start working
once the cement has been hydrated, but with the advances in the development of
admixtures, the time for activation is shortened, which means that more extenders
can be added.
“On top of this, even more fly-ash and ggbs are added at readymix plants.
And since fly-ash and ggbs are secondary products from the power generation
and iron industries, these products are used rather than ending up in a landfill”,
Main picture: Readymix, the
sustainable construction material
of choice. Photo courtesy of SARMA.
26
Jo u rn al 3 • Apr i l/May 2 0 15
he says.
“Similarly with cement bags, you can nowadays use less cement to make more
concrete thanks to extenders and admixtures. The strength
continues on p28
www.wa lls a n droof s . co . z a
sustainable cement & concrete
F e at u r e
“The imperial vastness of late Roman
architecture was made possible by the
invention of concrete.” – Iain McGilchrist
www. wal l s an d ro of s . c o.z a
J ou rn a l 3 • April/Ma y 201 5
27
su stainabl e cem ent & con cr e t e
continued from p27
of the concrete is determined by the cement-to-water ratio,
depletion of natural resources and the dumping of concrete
so being able to add less of these, with stone making up
in landfills. In addition, the average value for admixtures is
the volume, concrete is becoming a more environmentally-
220kg CO₂e per ton and for water 1kg CO₂e per ton.
friendly product,” Van Wyk adds.
Compared to 1972, today it takes 37% less energy to
A few years ago, the Cement and Concrete Institute
produce a ton of cement, enough to power 2,3-million homes
commissioned a study to determine the values of CO₂ emissions
a year. This is according to the Concrete Joint Sustainability
for all the ingredients of concrete, including cement, ground
Initiative, a coalition of concrete associations in America which
granulated blastfurnace slag (GGBS), fly-ash (FA), aggregates,
campaigns for the responsible use of concrete in sustainable
water and admixtures, and assessed the production of both
development.
ready-mixed and precast concrete.
While an accepted international ratio of CO₂ per ton of
cement is 1 000kg, it was found that by using cement extenders,
the overall CO₂ emissions can be reduced to averages ranging
from about 500kg to 900kg.
A holistic view
Van Wyk points out that sustainability does not only refer to
the CO₂ emissions of cement, but to all the environmental
concerns that go with the management thereof for its full
lifecycle. “If we think about sustainability, we have to think
Cement type
Average emission values
about people, jobs, good quality concrete, no rebuilds,
(kg CO₂e/ton)
no failures, responsible waste management and recycling,”
CEM I
985
CEM II A-L
840
CEM II A-S
815
CEM II A-V
790
CEM II B-L
720
CEM II B-S
730
CEM II B-V
690
CEM III A
560
CEM IV A
640
CEM IV B
570
CEM V A
590
CEM V B
415
he says.
Table 1: Average CO₂ emission values for different cements
and the effect of extenders on the overall CO₂ per ton.
(Note that these are average figures and the actual figures
will vary from supplier to supplier.)
“This is because the extenders, aggregates and water
play a very small role in adding to carbon emissions,” Perrie
explains. “So when you consider the reduced amount of
cement in a cubic metre of concrete, the emissions per ton of
concrete have come down drastically in recent years.”
Extender type
Average emission values
(kg CO₂e/ton)
FA
2
GGBS
130
Table 2: Average CO₂e per ton of extender.
According to the Concrete Institute’s publication,
Sustainable Concrete, for aggregates, the average CO₂e
per ton of cement is 5kg and if recycled concrete is used, it
further reduces this value while at the same time reducing the
28
Jo u rn al 3 • Apr i l/May 2 0 15
Readymix concrete. Photo courtesy of SARMA
w w w. w a l l s a n d ro of s . c o . z a su stainabl e cemen t & concr ete
Concrete derived from demolished structures can be
recycled and reused as construction material.
Readymix plants, for example, must adhere to legislation
Photo courtesy of The Concrete Institute
regarding environmental issues, health and safety and also
road transport. These include the use and reuse of water and
the management and recycling of waste water, as well as dust
management and the responsible handling of dump concrete.
The many benef its of
concrete:
When using site mix, it is the project team’s responsibility to
• Locally produced.
Qualit y
ensure that sustainable practices are followed.
• Labour-intensive, which leads to job creation.
“Quality, however, is not law,” Van Wyk states. “In the Eastern
• Design flexibility.
Cape last year, R600 million was paid for substandard
construction and as part of foundations, substandard
• Variety of finishes and new innovations.
concrete can lead to walls cracking an ultimately collapsing.
• Extreme durability.
• Cost-effective
because
“When something goes wrong with the concrete in a
of
durability
and
low
maintenance.
• Structural integrity.
• Thermal mass – critical for passive solar design of
buildings.
• Fire resistance.
building, it endangers many people at once.” He refers to a
building that collapsed in Meyersdal last year, killing seven
people, and a wall that collapsed at a Durban Hotel last
month, where two men were seriously injured.
“Anyone can make concrete and therefore the engineers
or consultants working on a project must plan to test the
standard of the concrete and ensure that these tests are
• Water-tightness.
done at a laboratory accredited for the tests. People who try
• Recyclability and reusability.
to save costs, compromise on the quality and also health and
safety concerns,” he advises.
www. wa l l s an d ro of s . c o.za
continues on p30
J ou rn a l 3 • April/Ma y 201 5
29
su stainabl e cem ent & con cr e t e
continued from p29
Lo c a l v s i m p o r t e d c e m e n t
Van Wyk explains that imported cement, for example, results
Concrete makes sense in green
building
in a loss of local jobs and may impact negatively on the quality
Perrie points out that apart from the many advances in the
of concrete. Usually it is offered at a cheaper price when there
manufacturing process, concrete has an excellent ecological
is an oversupply in countries such as Pakistan, India and
profile compared to some other construction materials.
sometimes China.
“Properties such as exceptional durability, thermal mass and
“While the cement might have been manufactured in
exactly the same way as local cement and may even carry the
recyclability add to the sustainability of concrete use in green
buildings,” he says.
SABS stamp, one has to stay cognisant of what happened to the
cement since. Just as fruit can rot, cement is also a perishable
product with a shelf life. And cement that is transported by
ship is exposed to high humidity, both while at sea and at the
harbour. I’ve seen contractors sifting cement on site to get
lumps out of what is clearly not suitable cement anymore,” he
says.
According to Van Wyk, there is a possibility of a tax being
added to imported cement, which will level the playing field
a bit more.
S p e c i f i c at i o n
When a building fails, the investigation aims to determine
whether the material has failed or whether the testing was
incorrect. “For a structure of 200 000m³ of concrete, all
decisions are made on a one litre, 100mm x 100mm test cube,
therefore it is imperative to make and test the cube correctly
and also to ensure that the test methods being used are not
out of date,” says Van Wyk.
“When engineers specify concrete, they have to make
sure they know exactly what they require. It is not enough to
only specify concrete strength and then you get something
cheap that, although it adheres to the specification, is difficult
to work with. Specification gives responsibility to the supplier,
contractor and engineer. When a dispute ends in court, it is
asked what was specified and how it was contravened,” he
explains.
“We in the built environment must take a stand against
delivering bad quality to the end-user and we have to start
with good materials,” he states.
“Architects need to explore the inherent advantages of
concrete and apply many different strategies to ensure the
sustainability of a structure in terms of its environmental and
social impact, to minimise the use of energy, to minimise the
use of water, and the generation of waste. All of this can only
be assessed by carrying out a full lifecycle assessment of the
structure,” Perrie concludes.
“Compared to 1972, it takes
37% less energy to produce
a ton of cement, enough to
power 2,3-million homes a
year.” – The Concrete Joint Sustainability Initiative
Full thanks and acknowledgement are given to the Concrete
Institute and SARMA for the information given to write
this article.
To view the Concrete institute’s publication
on Sustainable Concrete, scan here.
30
Jo u rn al 3 • Apr i l/May 2 0 15
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www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
31
su stainabl e cem ent & con cr e t e
Reusable
concrete
elements
vital for
sustainabilit y
In a recent statement, Bryan Perrie, managing
director of the Concrete Institute, pointed out that
more attention should be paid to the reuse and
recycling of building materials at the design stage
to more actively promote sustainability in the
construction industry.
to-use, cost-effective mortarless system that requires less
material and equipment staging areas, as well as fewer pieces
of large equipment for manufacturing and installation than
cast in-situ solid concrete.
Crushing clean building rubble
In the Western Cape, Terraforce concrete retaining block
manufacturers and contractors, Klapmuts Concrete and Cape
Retaining Systems, are also committed to reduce their carbon
footprint. Like most Terraforce manufactures locally and
abroad, Klapmuts applies a crusher to re-use all broken and
reject products.
Recycled building rubble and crushed glass are used in the
manufacturing of Terraforce concrete retaining blocks.
Johan van Wyk, chief executive officer of Klapmuts
Concrete, says: “We recycle all reject blocks as well as blocks
that get damaged during the split operation of the rock face
blocks. We accept clean building rubble (no timber, plastic,
errie says: “There is growing concern worldwide about
the wastage of materials such as concrete, wood, gypsum, metals, bricks, glass, plastics and salvaged building
components. Yet there is tremendous potential to recycle so many elements of the construction cycle.”
The Terraforce concrete retaining wall and erosion control
32
metal, etc.) from builders, as well as rejects from another
building block manufacturer in our area. To ensure that the
rubble can be used in our products without comprising
quality, it was graded by a SANAS-accredited laboratory.”
A d d i n g g l a s s to t h e m i x
system has been a sustainable product since its inception 35
When approached in 2013 by Nelson Glass, a major processor
years ago – long before it became fashionable. It is a hollow-
of plate glass in Cape Town, Van Wyk immediately took
core and closed-faced system that allows for maximum water
interest in their proposal to use crushed, recycled glass for
absorption and plant growth, once installed. It is also an easy-
block production.
Jo u rn al 3 • Apr i l/May 2 0 15
w w w. w a l l s a n d ro of s . c o . z a su stainabl e cemen t & concr ete
Nelson Glass collects offcuts and broken glass from
most big processing companies
and runs it through a crushing
and screening process, which
converts it into a reusable chips
or sand format. This can then
be supplied to the building
industry for the manufacturing
of cement blocks or slabs,
replacing sand and stone.
Klapmuts Concrete started experimenting with crushed glass late in 2014.
Following a series of screening tests and based on studies done in the USA, the
decision was made to use crushed glass in limited quantities in almost all their
products. “It was the perfect opportunity to use even more recycled products in our
concrete mix, replacing more virgin material in the manufacturing of our products,”
says Van Wyk.
Klapmuts currently uses two products – a course product that compares
favourably with standard 6mm stone and a dust that is very similar to crusher
dust.
C o n c r e t e b lo c k s w i t h a s pa r k l e
“The mix designs were adjusted to accommodate these products without
jeopardising the strength of the blocks,” explains Van Wyk. “The finishes of the
products are exactly the same as with normal aggregates, except that the rock face
blocks now have a slight twinkle on the rough face.”
The end-result is that glass waste that would have ended up in a landfill as
a hazardous and non-degradable by-product of the glass industry, is transformed
into a useful, eco-friendly substitute, reducing the carbon footprint (reduction of
mining of raw material and waste disposal) of both Klapmuts and Nelson Glass.
Terraforce
Tel: 021 465 1907
Website: www.terraforce.com
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
33
su stainabl e cem ent & con cr e t e
Concrete and steel surfaces
lined with protection
a.b.e. Construction Chemicals’ VIP Polyurea Quick
Spray Industrial, a hot-spray, two-part coating was
applied as protective lining for several new concrete
and steel surfaces throughout South Africa.
or the new water park at The Kingdom holiday resort
in Pilanesberg, a.b.e supplied the coating in a blue
colour for a surface area of about 800m². Subsequently, the product has also been chosen as lining for two
further water parks to be developed in the North
West Province.
VIP Polyurea Quick Spray Industrial was also specified as
part of the refurbishment of the six-storey Ashburn residential
apartment block in Claremont, Cape Town, applied to about
1 000m² of concrete passages.
Finally, the coating was used to replace the rubber
linings and provide chemical and abrasion resistance to
18m diameter water retaining concrete launder tanks, and
24m diameter steel clarifier tanks, at the gas production
plant in Secunda.
In Boskop, near Bapsfontein, the Polyurea product
was used to line new biofuel silos as well as seal the seams
of galvanised metal tanks that contain high-concentrate
chemicals. A total of about 400m² of the coating, in a grey
colour, was required.
“The product reacts
within seconds and once
cured, leaves a durable
and rough surface.”
The new water park at The Kingdom holiday resort in Pilanesburg.
“VIP Polyurea Quick Spray Industrial is a fast-setting,
100% solids coating/elastomer which has an intricate pore
density that provides excellent corrosion protection to all
substrates,” says Noel Abendroth, a.b.e. Polyurea Performance
Coatings division manager.
“The product reacts within seconds and once cured,
leaves a durable and rough surface. It is suitable as a
protective coating for virtually any surface including
concrete, steel, wood, polystyrene, fibre glass and plastic,”
Abendroth explains.
One of the concrete passages at the Ashburn residential flats in
Cape Town.
34
Jo u rn al 3 • Apr i l/May 2 0 15
a.b.e Construction Chemicals
Tel: 011 306 9000
Website: www.abe.co.za
w w w. w a l l s a n d ro of s . c o . z a su stainabl e cemen t & concr ete
C e m e n t - b a s e d wa l l f i n i s h e s –
for the life of the building
Decorative cement-based finishes are the perfect example
of a synergy between beauty, sustainability and economy.
Cemcrete’s decorative finishes on vertical surfaces are
not only aesthetically attractive – and available in a wide
range of colours – but also waterproof, economical and
extremely durable.
Cement has numerous properties that make it one of the
most sustainable materials to be used in building and finishing.
For one, it is made up of natural aggregates, sand and rock
with the addition of water, which use little energy-utilising
equipment to obtain. Cement also does not omit any VOCs.
What’s more, it has an extremely high thermal mass, meaning
that it can easily store heat during the day and radiate it out
at night. Heating and cooling systems can consequently be
used more efficiently.
The durability of cement also contributes to its
sustainability as its long lifespan means cutting down the
Most of Cemcrete’s
wall finishes are supplied in
dry powder form, requiring
water and/or bonding liquids
to be added on site. Wall
coatings such as CemWash
and CemCote, perfect for
achieving
an
attractive
mottled and textured finish
for both interior and exterior
walls, are brushed onto the
The off-shutter wall look.
surface using a brush, along
with various other application
techniques to achieve different looks. For a smoother
look, Cemcrete also offers steel-trowelled applications like
CemPlaster for exterior walls and SatinCrete for interior walls.
Both the trowel-on wall finishes are ideal for use in bathrooms
or for creating the popular off-shutter wall look.
need and cost for new finishes. On a more superficial level,
once sealed, cement has no surface porosity. This means that
nothing can penetrate the surface, so it doesn’t allow bacteria,
dust and other harmful elements to collect and embed on and
into the surface.
www. wa l l s an d ro of s . c o.za
Cemcrete
Tel: 0860 CEMCRETE
Website: www.cemcrete.co.za
J ou rn a l 3 • April/Ma y 201 5
35
F e at u r e
green buildings
l aunching a new era for
interior architecture
The Green Star SA Interiors rating tool, launched by the Green
Building Council of South Africa (GBCSA) in February, encourages
tenants to rate interior fit-outs with the overall aim to reduce the
environmental impact of interior projects. At the same time, it is set to
change the way in which professional teams approach projects, and
could increase the demand for sustainable products that are certified
by approved third-party certification systems.
he Green Star SA Interiors rating tool considers interior fit-outs from an
all-round perspective and rewards high-performance tenant spaces that
are healthy, productive places to work and incentivise best practice for
sustainable and efficient interior design that is also less costly to maintain
and operate.
Interior designers and architects have welcomed the tool, which they expect
would provide them with a benchmark for green interior design as well as a means
of measuring so-called green products.
“Finally there is a tool which can be used to rate refurbishments and interior fitouts,” says Salomien Pieterse, interior architect at Boogertman + Partners Architects.
“I think this is going to challenge especially the product suppliers and we look
forward to the change which is going to come about as a result.”
S p e c i f i c at i o n a h i t a n d a m i s s
Geoffrey Bennett, design director at Collaboration, who was part of the technical
working group developing the rating tool, believes the tool will do away with
“greenwashing” by suppliers and manufacturers, compelling them to get their
36
Main picture: The interior design of
Virgin Active’s Alice Lane Club was
submitted for the Interiors tool pilot
programme.
products certified in order to back up any green statements.
Photo courtesy of Virgin Active
be a sustainable source, but it has to be transported halfway
Jo u rn al 3 • Apr i l/May 2 0 15
“At the moment it is kind of a hit and a miss, because it is very difficult to
determine whether a product actually is green or not. For example, bamboo might
continues on p38
www.wa lls a n droof s . co . z a
green buildings
F e at u r e
“finally there is a tool which can be used to
rate refurbishments and interior fit-outs.”
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
37
green buil d i n g s
1
1. The new GBCSA offices feature principles of sustainable design and tested
the application of the new Green Star SA Interiors rating tool.
2. Nature has been brought into the office spaces with a living wall of plants,
planted room dividers and a herb wall.
Photos courtesy of Collaboration.
continueD FROM p37
around the world to get here. Or you might be buying a locally
produced chair, but 80% of the components are imported,” he
explains.
“Because product information in terms of make-up and
production has been very poor up to now, we have mainly
specified according to durability and our own investigations
of products,” says Bennett.
“Coming in very handy,” adds Colin Myers, Collaboration
accredited Green Star professional, “are local bodies rating
and certifying products and materials, taking the burden off
the specifiers, architects and designers. This is still very new
in South Africa, but will make it a lot easier to certify projects
in the future.”
Janice Kode, national projects architect at Virgin Active,
agrees. “We have worked with a number of suppliers for many
years who know that this is one of our requirements to specify
green rated products. Important considerations are the source
of the product – its make-up being from sustainable resources
and not containing formaldehydes and VOCs, as well as the
2
38
Jo u rn al 3 • Apr i l/May 2 0 15
longevity of the product. Manufacturers that don’t have eco
labels could eventually be squeezed out of the market.”
w w w. w a l l s a n d ro of s . c o . z a g reen buildings
How much ex tra will it cost?
Kode points out that during the pilot phase there has been
a great deal of resistance to any major additional costs
attributed to greening the interior over and above the four star
requirement. For example items such as additional metering;
additional fresh air intake and additional commissioning
processes can all become very costly.
“This doesn’t necessarily impact floor and wall finishes,
since there is such a large variety of choices available, but
definitely in terms of HVAC and electrical, it can add up to
hundreds of thousands if we aim to achieve all the credits.”
“Some sustainable materials that require proof of chain of
custody, for example, are not only difficult to acquire, but
would also come with a cost premium,” she says.
“This is such a debatable point,” says Pieterse. “Green
products are not necessarily more expensive, but as with any
new product on the market, they usually enter the market at a
slightly higher cost, which eventually decreases.”
The chief technical officer at the GBCSA, Manfred
Braune, agrees. “From an interiors perspective, some green
products which are not locally available might cost more in
the beginning, but as demand increases, the prices will drop
– similar to what happened with low VOC paints through the
application of Green Star SA in the market.
“It is a common misconception that building green
is more expensive, but it typically becomes so when it isn’t
planned from the concept stage. Green fit-out budgets may
“A green interior will also save the tenant money through
lower energy and water usage, but the biggest financial win,
although difficult to measure, is good indoor environment
quality as it will positively impact the occupants’ health and
productivity,” he says.
“Another dynamic that can influence the cost of green
buildings is lease terms,” highlights Bennett. For the model to
make financial sense, the payback time has to be shorter than
the lease.
“In the corporate industry, companies are signing longer
leases than before, so although the initial investment might
be higher, in the long run, the company will reap the benefit.
Companies which set up shop for short terms, probably won’t
go the certification route, but medium to large organisations
see the benefit of signing longer leases and investing upfront
in sustainable fit-outs,” he explains.
“What is interesting though is that in the retail industry,
longer leases mean less movement, so these companies might
have very different criteria as to how they would manage
green compared to other corporate industries.
“Sustainable design goes together with best practice, so
it shouldn’t cost more than normally,” adds Bennett. “Really
the only additions are for the accredited professional that
has to certify the project, the GBCSA fee for registering and
assessing the project and things such as heat modelling,
which is optional. The rest should run as a normal project.”
need to be given more attention now that product content
Team dynamics in the bal ance
must be analysed better before selection, to allow the project
Since the tool is still new, Pieterse expects that convincing
to add green building as a key integrated outcome rather than
being seen as an add-on,” he explains.
www. wa l l s an d ro of s . c o.za
clients to pursue an interiors rating will be the biggest
challenge. Therefore, when starting
continues on p40
J ou rn a l 3 • April/Ma y 201 5
39
green buil d i n g s
I n t e r i o r s r at i n g to o l – w h at y o u n e e d to k n o w
Certification for:
• Retail and commercial office space.
• Single
tenancy certification
SAMPLE
TEXT in
a multi-tenanted
building.
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t.M oreli
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• Indoor
spaces
even
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ferme
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to euwhere
molestie
rhoncus.
overall building is not certified.
Differentiating factors
Impact:
• Save money.
• Existing and new buildings.
• Increase productivity.
• Product certifications.
SAMPLE TEXT
• Enhance marketability.
• Future-proof tenancy.
• Competitive advantage.
• Attract and retain top talent.
Eight holistic impact
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7. Land use and ecology.
8. Emissions.
Bonus: Sustainable innovation.
continueD FROM p39
off towards attaining an interiors rating, it is imperative that
the designer to manage W/m² usage, and the mechanical
everyone in the professional team, including the client, agrees
engineer,
on what the aim is and follows an interactive approach that is
loads are higher and lower for ideal air-conditioning
constantly measured.
placements.
who
can
help
to
determine
where
heat
“In a new role, an accredited professional (Interiors AP)
would play a key part in leading the project team through the
process from a concept stage and make sure that they stay on
track,” notes Braune.
40
Si t e s e l e c t i o n i s k e y
“While the tool strongly influences tenant design and
construction considerations in their fit-out, it also has an
Other team members are also vital, Bennett points
upstream impact on landlords, who will be questioned about
out, such as the electrical engineer, who will work with
the building’s inherent green credentials, and will influence
Jo u rn al 3 • Apr i l/May 2 0 15
w w w. w a l l s a n d ro of s . c o . z a g reen buildings
the tenant’s decision whether to sign a lease in that building
or move to another greener building,” says Braune.
S ta r t i n g to d ay
In pursuing a greener interior, building managers can engage
As part of the technical working group developing the
proactively with tenants to assist them in operating their space
tool, Collaboration experienced first-hand how site selection
more efficiently, starting by assessing their consumption of
is an important consideration for tenants who want to have
water and electricity and waste production.
their interiors rated. Key factors include natural light, an ideal
orientation, access to transport and local amenities, and a
landlord who will agree to make the necessary adjustments.
“The existing building performance tool marries very
well with the interior tool. Black River Park is a good example,
having achieved an existing building rating. The fact that they
have put in work to make the base building efficient puts
them, or the next generation of tenants, in a great position to
pursue the interiors rating as well,” remarks Meyers.
“They can also implement some green measures for the
tenant, where the tenant could agree to share a part of the
saving that results from the installation,” says Braune.
Pieterse’s advice is to start with simple actions such
as switching off lights and using water wisely, as well as to
ensure that all building users are educated, whether they are
occupying a Green Star rated building or not. “If we all start
small, eventually together it will make an impact.”
Kode, however, points out that currently the Green Star
rating system, in contrast with LEED, no credits are carried
Full thanks and acknowledgement are given to the GBCSA,
over from the base building rating to the interiors one, so the
Collaboration, Virgin Active and Boogertman + Partners
interior consultant has to start from scratch every time.
Architects for the information given to write this article.
“We have also found, during the pilot phase, that working
within a Green Star precinct where separate consultants were
appointed for the base building rating and the interior fitScan here to get the interiors V1
scoresheet and critria.
outs, there are both some conflicts and overlaps and there can
be a hesitancy to share information, which makes the whole
process a little more difficult,” she states.
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
41
F e at u r e
roofing & Ceilings
movable roof
a modern marvel
The spectacular exterior and movable roof system of the Innovation,
Science and Technology Building (IST) at the Florida Polytechnic
University’s new campus certainly serves to create an inspirational
environment for innovative education.
esigned by Santiago Calatrava, the IST building, which functions as the primary facility on campus, has been constructed on the north side of a linear
lake and is made up of aluminium, concrete and glass. In time, more buildings
will be added around the lake, with four pedestrian bridges and a ring road
ensuring that everything on campus is at most a ten-minute walk away.
A d j u s ta b l e r o o f
Stretching across the 18 580m² structure, the 76 metre operable roof constitutes
two sets of 46 aluminium louvres that can be raised or lowered in relation to the
sun, with the purpose of either providing shading or maximising daylight through
a skylight into the commons below.
Reminiscent of butterfly wings, these louvres are hydraulically operated. They
are individually controlled and can be programmed to follow the course of the sun
throughout the day. Solar panels are planned to be fitted to the aluminium louvres
to create a solar array of just over 1 850m².
Arched framework
Renowned for his bone-white, anthropomorphic, movable designs, Calatrava’s
design of the exterior of the IST features another striking component – a continuous
Main picture: The IST building at the
Florida Polytechnic University exhibits
a spectacular exterior and movable roof
system, designed by Santiago Calatrava.
Photo courtesy of Joel Morales.
42
Jo u rn al 3 • Apr i l/May 2 0 15
pergola envelope that surrounds the entire building from the ground up to
the roof.
This light-steel lattice functions as a perceptual ceiling for the outdoor garden
terrace and the wide walkway around the IST building.
continues on p44
www.wa lls a n droof s . co . z a
roofing & ceilings
F e at u r e
Reminiscent of butterfly wings, these
louvres are hydraulically operated.
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
43
roof ing & cei l i ngs
1.
1. The exterior of the building is ringed by a whitepainted pergola. © Joel Morales
2.
2. The iconic IST building at the Florida Polytechnic
University. © Joel Morales
continued from p43
In addition to allowing natural ventilation,
partial shade and a view across the lake, it
also reduces the solar load on the building
by 30%.
Apart from enhancing and reflecting
the building’s extraordinary appearance,
the lake further acts as the primary
stormwater retention and storage vessel
for site irrigation. The entire campus site’s
the lake acts as the primary
stormwater retention and storage
vessel for site irrigation.
sensitive ecology is a valuable polytechnic
educational tool.
With its original design and exciting
architectural features, the IST building has
already become an iconic symbol of the
university.
Take a closer look at the design of the
IST building at Florida Polytechnic
University. Scan here.
44
Jo u rn al 3 • Apr i l/May 2 0 15
For more information, visit www.archinect.
com and www.archdaily.com, to which full
thanks and acknowledgment are given.
w w w. w a l l s a n d ro of s . c o . z a A dver tor ial
Acoustic
healing:
EBD for
healthcare
environments
The indoor environment of a hospital can impact
directly on a patient’s wellbeing and influence
the rate and effectiveness of recovery. Therefore
the architectural and functional elements of the
building’s design are vital for ensuring stress-free
areas of recuperation.
Sound for healing
According to a publication by Busch-Vishniac et al, there is
a clear trend of rising noise levels in hospitals since 1960,
increasing on average by 0,4dB per year. This is fast becoming
t the Saint-Gobain 2014 Healthcare Summit, acoustics
a costly and dangerous threat in many healthcare facilities as
was one subject of evidence-based design research that
excessive noise is disruptive and can contribute to errors.
was highlighted by architect and designer Richard Mazuch, who advocates and creates innovations that positively impact the psychology and physiology of patient groups.
Noise levels are raised by several factors, including the
insufficient insulation of walls, ceilings and services and the use
of sound-reflecting, rather than sound-absorbing surfaces.
Reducing sound levels not only helps healthcare
professionals to focus better, but it has also proven to aid
patient recovery: It improves quality of sleep, lowers blood
pressure, reduces intake of pain medication and ultimately
cuts readmission rates. What’s more, it can also reduce staff
stress levels and positively impact productivity.
W h at c a n a r c h i t e c t s d o ?
Acoustics may be an “invisible” architectural outcome and
many behind-the-scenes operations, such as services, can
have an intensive impact on the sound environment. Acoustic
insulation of the ventilation and air-conditioning systems and
service pipes alleviates this and has been proven to reduce
Solut i ons for effect i ve
acoustic des ign:
• Ecophon sound-absorbing ceiling and wall absorber
systems create healthy indoor environments.
• Gyproc’s SoundBloc walling systems have been
designed and developed with sound
insulating properties in mind.
• Gyproc Celotex Mineral Fibre ceiling tiles
are performance acoustic ceiling tiles that
are designed to control sound levels.
• Isover’s high-performance range of ceiling, walling,
flooring, perimeter and services insulation
noise levels significantly.
Acoustics in buildings is about addressing both sound
insulation and sound absorption. Sound absorption refers to the
ability of a surface material to absorb the sound energy created
within the room, as opposed to reflecting that energy. This is
critical to reducing noise, improving privacy and improving
quality of speech and hearing. In turn, sound insulation relates
to the overall ability of a building element or building structure
to reduce the sound transmission through it.
Saint-Gobain has analysed the specific requirements
of healthcare facilities and formulated solutions that
accommodate sound considerations through the structure
of walls, floors and pipes, and the performance of acoustic
ceilings. Call them today for a solution for your project.
ensures acoustic and thermal comfort.
Saint-Gobain Gyproc
• Gyproc Gyptone/Rigitone is a range of
characteristically styled ceiling boards with high
Tel: 012 657 2800
levels of acoustics absorption and impact resistance.
www. Saint-Gobain.co.za
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J ou rn a l 3 • April/Ma y 201 5
45
roof ing & cei l i ngs
Roof profile curved and cranked
to create unique roof
for Cell C
Cell C’s head office in Midrand is covered by Global Roofing Solutions’ Klip-Tite roofing profile.
lobal Roofing Solutions’ Klip-Tite roofing profile, rolled
in 0,58mm Chromadek Charcoal, was specified for 26
200m² of roofing for the striking Cell C head office and
warehouse at its Johannesburg campus in the Waterfall
Business Estate in Midrand.
The project development was nominated for the 2014
Steel Awards in the Factory and Warehouse category.
According to Rashaad Jogie from Empowered Spaces
Architects, who designed the Cell C warehouse, the Klip-Tite
roofing profile was specified based on the product’s trackrecord and proven performance.
“We have used the product before and based on our
experience on previous projects, we were confident to use it
again,” comments Jogie.
He also points out that the unique shape of the
warehouse roof required accurate bull-nosing, cranking and
curving of the sheeting to create the suggested design, so the
selected roof profile had to be able to accommodate these
manipulations, which the Klip-Tite system did well.
T r a n s v e r s e pa n s s t i f f e n e r s –
a South African first
Methods to stiffen the pan were tested and it was decided
to introduce transverse stiffeners in lieu of the traditional
longitudinal pan stiffeners, in order to form structural
members spanning across the width of the pan.
“A first in the South African sheeting market, these
stiffeners reduced the deflection of the pan, increasing the
wind uplift resistance of the sheet,” says Van der Westhuizen.
E x c e l l e n t w i n d u p l i f t r e s i s ta n c e
Ri g o r o u s t e s t i n g
Testing conducted on the new profile showed improved wind
uplift resistance results compared to the existing Klip-Lok
700 product. However, further tests indicated that the clip
then became the weak point, and it was decided to introduce
additional stiffeners in order to achieve a balanced system
design and even higher wind uplift resistance. According to
Van der Westhuizen, the ultimate wind uplift resistance of
Klip-Tite is 1,8kPa compared to 1,6kPa for Klip-Lok 700.
According to Johan van der Westhuizen, deputy chairman
at Global Roofing Solutions, the Klip-Tite product has
been developed and advanced through continuous
in-house testing.
In addition to the Cell C development, Klip-Tite has
already been supplied for more than 400 other projects,
covering over 2 000 000m² of buildings in South Africa,
Botswana and Swaziland.
“We realised that roof failure is normally caused by
the sheet unclipping from the fixing clip, during high wind
uplift pressure,” Van der Westhuizen notes. “We found that
the weak point of sheeting is the flat (wide) pan, which is
sucked upwards, causing dimensional changes and eventual
Global Roofing Solutions
Tel: 011 898 2900
Email: [email protected]
Website: www.globalroofs.co.za
“We were happy with what was delivered at the end
of the day and we haven’t had any leaks or failures thus far,
which makes us very pleased with the choice of roof sheeting
for the Cell C project.”
46
failure. During the applied upwards pressure, the pan deflects
upwards in the form of a bow, causing the edges of the pan
to rotate inwards, which increases the width of the narrow rib
and allows the narrow rib indentations to slip over the clip,”
he explains.
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47
roof ing & cei l i ngs
Insul ating existing buildings –
the rational choice
While it is not yet mandatory to make existing buildings operate more efficiently,
within the energy-efficiency net there are compelling benefits for such retrofits.
ew buildings and some renovations must already comply with the National Building Regulations (NBR) Part
XA, as promulgated at the end of 2011, which regulates
the designed energy efficiency of most building occupancy types. However, as existing building stock falls outside
the stipulations of the NBR, it will be many years before all
buildings are rebuilt with energy-efficient operation as an ob-
Our advice: Thermal comfort
Considering building insulation, IsoBoard recommends that
insulation is introduced to the point where it makes a tangible
difference to the comfort of building users, or to the costs of
heating or cooling the space.
Where people are the main focus of the building,
maintaining a comfortable environment is the primary
jective.
In the absence of regulation, interventions would
typically be based on rational incentives, with benefits
exceeding costs.
driver of energy efficiency, reducing the need for energyhungry heating and cooling interventions. Most people
feel comfortable in the temperature range between 20°C
and 27°C.
W h at c a n e x i s t i n g b u i l d i n g
owners do?
Though there might be opportunities available for both
commercial and residential building owners to introduce
energy-efficient interventions, the benefits must be significant
enough to motivate such actions.
A d d i n g i n s u l at i o n to a n
existing building
To achieve the comfortable temperature range, a thickness of
40mm IsoBoard installed within the roof or as a ceiling will
reduce heat flow inward and outward, with minimum heating
or cooling. Adding additional thicknesses of insulation may
Many national retail or high-profile institutions will
inevitably improve their buildings to uphold brand image
and corporate objectives, whereas other building owners and
users will have a cost versus benefit focus.
make the internal temperature more consistent, but without
actually raising or reducing the temperature.
Where required, IsoBoard can be fixed to exterior or
interior walls, and plastered or lined to protect the installation.
IsoBoard can also be fitted externally around foundation
perimeters to achieve a similar effect to insulate the floor
slab. Using a thickness of 30mm, IsoBoard will generally
increase the slab temperature between 4°C and 7°C, thereby
reducing the use and running costs of any under-floor
heating system.
Any flat-topped building with a concrete roof slab
will benefit from having IsoBoard installed above the
waterproofing layer in an inverted roof application. With its
excellent water-resistant properties, IsoBoard is also an ideal
solution for green roofing applications.
Should you have a pre-2011 building which you believe
could be more comfortable and energy efficient, contact
IsoBoard to discuss retrofit opportunities.
Isofoam SA (Pty) Ltd
Tel: 021 983 1140
IsoBoard insulation installed over purlin under the roof sheet.
48
Jo u rn al 3 • Apr i l/May 2 0 15
Website: www.isoboard.com
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49
roof ing & cei l i ngs
Leading metal roofing
manufacturer, Global Roofing
Solutions (GRS), has relocated
two of its operations, Western
Cape and KwaZulu-Natal, into
new, state-of-the-art facilities
situated in Epping and Mount
Edgecombe respectively.
The fron entrance to the new GRS operation in Cape Town.
Improved facilities
to boost capacit y, service delivery
his move, says company managing director, Marius
“The new building is superb. It’s very prominent, easy
Smith, follows significant growth by the company over
to locate and makes the right statement to the local market,
the past two years and the need to invest in additional
namely that GRS is bigger, stronger and ready to deliver on
capacity to meet GRS’s expansion strategy.
our vision of delivering exceptional outcomes,” he says.
“In Cape Town, GRS has moved from Killarney Gardens
into bigger, improved premises in the well-known industrial
area of Epping,” Smith states. “This infrastructure covers over 7
000m2, of which about 6 000m2 is under roof. Millions of rands
worth of stock and four production lines were included in the
move, which has enabled the production team to prevent any
downtime and ensure continuity of supply,” he adds.
In Durban, Marc Arnould, general manager for GRS
KwaZulu-Natal, and his team relocated from an old part of
downtown Durban to new premises in Mount Edgecombe,
just outside Umhlanga on the North Coast.
Perfect positions
While selecting the new sites, the company specifically looked
for bigger, highly visible premises that are easily accessible for
customers and suppliers.
“GRS has an aggressive growth strategy in all our regions
of operation, including the Western Cape and KwaZulu-Natal.
The new facilities are well-suited to accommodate this growth,
with multiple loading bays for improved loading and delivery,
overhead crane facilities, improved manufacturing flow and
ample office and support infrastructure,” says Smith.
“We also have space to establish cash sales centres for
walk-in customers in the general building market. Coinciding
with the two new locations, GRS has also expanded its mobile
mill operation, specifically for its popular Klip-Tite product,
with further growth anticipated.”
Global Roofing Solutions
Tel: 011 898 2900
Email: [email protected]
A view of the multiple despatch bays.
50
Jo u rn al 3 • Apr i l/May 2 0 15
Website: www.globalroofs.co.za
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51
roof ing & cei l i ngs
Performance ceiling tiles
to complement any look
Suspended ceiling tiles
What’s more, the Daiken New NDF mineral fibre acoustic
suspended ceiling tiles have a non-direction, fissured,
clean white surface and are one of ceiling contractors’ most
favoured commodity panels due to their durability and ease
of handling.
New NDF is the most economical tile in the Daiken range
and has a medium noise reduction coefficient (NRC) and ceiling
attenuation class (CAC) to help reduce reverberation time
and to prevent sound transfer through the ceiling plenum.
These ceiling tiles are guaranteed for ten years against visible
sagging up to 40°C and 99% relative humidity.
O u t s ta n d i n g p r o p e r t i e s
Application: Softline
The Daiken ceiling tiles are non-combustible and do not emit
Complementing CAPCO’s extensive range of ceiling
tiles, the Daiken range of mineral fibre ceiling
tiles offers outstanding fire resistance, thermal
insulation and sound absorption.
aiken is one of the leading ceiling brands in Japan
known for its continuous development of technology
and manufacturing processes with a strong focus on en-
toxic gas or smoke, melt, break or become deformed under
normal fire conditions, thereby protecting ceiling areas
from fire.
Their thermal insulation is more than six times that of
gypsum board, which attributes to maintaining room comfort,
resulting in savings in terms of cooling and heating costs.
In addition, the tiles’ superior sound absorption
and insulation characteristics further assist in creating a
comfortable and quiet room environment.
vironmental and sustainability standards.
Ceiling tiles
Daiken Ceiling Tiles offers high RH99 (relative humidity)
levels for projects that require the strictest of demands and
comes in an assortment of face patterns suited to a wide
variety of commercial applications, including office fit-outs,
foyers and halls.
Mi n e r a l f i b r e a c o u s t i c pa n e l s
The Daiken Excel-Tone MR (moisture-resistant) mineral fibre
acoustic panels have high resistance against moisture, as well
as excellent fire resistance and thermal insulation properties,
providing superior quality for ceiling applications.
Daiken Excel-Tone MR tiles have proved to be of superior
Daiken mineral fibre ceiling tiles are suited to a wide variety
of commercial applications.
quality and are therefore guaranteed for ten years against
52
visible sagging at temperatures up to 50°C and 99% relative
CAPCO
humidity. These tiles can even be used in rooms without air-
Tel: 031 569 6090
conditioning or in a high humidity environment.
Website: www.capco.co.za
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roof ing & cei l i ngs
A sustainable
home of
the future
Under the United Nations Framework Convention
on Climate Change (UNFCCC) and its Kyoto
Protocol, South Africa committed to contributing
its fair share to global greenhouse gas (GHG)
mitigation efforts. South Africa has committed
itself to an emissions trajectory that peaks at 34%
below a “business as usual” trajectory in 2020 and
40% in 2025.
t is critical that average global temperatures do not rise
above 2°C from pre-industrial levels in order to avoid the
most severe social and environmental consequences.
The Green Building Council South Africa (GBCSA), with
its partners and a set of sponsors which included Isover Saint-
Isover glass wool insulation.
“My Green Home” tells the story
of how one South African
family changed their home to
help change the world.
Gobain, spent six months working with one suburban family
to green their home and show what is possible in a project
called “My Green Home”. (Website: mygreenhome.org.za)
Each built-in ton of Isover glass wool insulation helps us
save 6 tons of CO₂ every year.
“My Green Home” tells the story of how one South
The discarded waste glass by industry and households is
African family changed their home to help change the world –
turned by ISOVER into a valuable raw material. ISOVER glass
and shows how you can too. The Ngewana family got a green
wool consists by about 80% of recycled waste glass. The other
home makeover and were tasked to reduce their electricity
ingredients such as quartz sand, soda ash and limestone are
consumption, water consumption, waste landfill, and improve
virtually inexhaustible resources. This does not only sound but
their daily habits to show you how to save money and help
definitely is ecologically sustainable in many ways. The use of
save the earth.
glass wool does not only help us meet the Kyoto target but
The big retrofit transformed their house with energy
efficient technology and earth-friendly products installed in
their home to make it as efficient as possible.
also realise energy-efficient living all around the globe.
Just consider: The production of 1 ton of glass wool
releases about 0.8 tons of CO₂. The annual CO₂ saving that can
be realised by building in glass wool amounts to as much as
In six months the Ngewana family managed to achieve these
savings with all the interventions done:
• Electricity consumption: 53%
to 300 tons of CO₂. And this is 375 times as much as the CO₂
emission caused by production.
Choosing the correct insulation to use in your home
depends on various factors such as climatic zone, R-value,
• Water consumption: 44%
combustibility of the product and performance, for more in-
• Waste to landfill: 81%
54
6 tons. Assuming a useful life of 50 years, we can thus save up
depth information you can visit our website.
One of the interventions was that their entire ceiling was fitted
Isover
with Saint-Gobain Isover Aerolite Insulation 135mm thick
Tel: 0860 ISOVER (476837)
(R-value: 3.38) and Geyser Insulation. The family reported that
Fax: 086 673 1088
their home was noticeably more comfortable.
Website: www.isover.co.za
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55
roof ing & cei l i ngs
Zinc profile enables
striking roof designs
An eye-catching feature: Rheinzink’s
angled standing seam.
A relatively modern development in the field of traditional sheet metal technology, the angled standing
seam option from Rheinzink is particularly suitable for visible design areas of metal roofs with a roof pitch
greater than 25°C as well as for rounded parapets, fascias, attics and mansard roofs.
“
hether running in the traditional vertical
Phone
Rheinzink
direction, diagonally or horizontally, the
roofing option.
today
and
explore
this
striking
angled seam offers greater seam width than
the double standing seam and is an eye-
catching feature even over large areas of roofing,” says Stephen Wilkinson, business manager at Rheinzink South Africa.
“As the angled standing seam looks wider than the
Rheinzink
Tel: 021 671 2600
Email: [email protected]
Website: www.rheinzink.co.za
double standing seam, striking effects are achieved with the
first turn of the seam. Therefore this elegant profile lends a
vibrant, distinctive structure to large surface projects,” he
adds.
Tapering, concave and convex designs are possible for
roof pitches from 25°C, or 35°C in regions with heavy snowfall.
Lengths of up to 16m are possible for roofing applications.
Panels can also either be pre-profiled or fabricated
on site. Closing the seams of the prefabricated sections is
• Design through distinct lines.
• Cost-efficient for virtually every building style.
• Ideal for roof pitches more than 25°C.
• Rainproof longitudinally seamed joints.
simple, compared with the double standing seam. The angled
• Simple, efficient installation.
standing seam is completed simply by folding in one leg. Trays
• Roof applied solar solutions possible.
can easily expand and surface distortions are avoided as less
stress is placed on the metal when the seam is formed.
56
Main features:
Jo u rn al 3 • Apr i l/May 2 0 15
• Environmentally friendly declared product.
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roof ing & cei l i ngs
Why do
roof trusses
fail?
Roof trusses should be a safe and straightforward
way of erecting roofs, yet failures occur. While
product and service providers carry a great deal of
responsibility, ultimately, in terms of the National
Building Regulations (NBR) it is the building owner
who is held accountable for the roof and the
necessary inspection thereof.
he majority of roof truss failures, about 85%, occur due
to poor roof truss erection, where constructers don’t adhere to the provided roof system details, according to
Uwe Schlüter, business development manager at MiTek.
This figure also includes modified roofs that were never reinspected. And while approximately 11% of failures occur due
to incorrect truss manufacturing, where manufacturers either
don’t adhere to the provided roof system details or use the
Midstream Shopping Centre. Courtesy of Hi-Tech Nail Plate.
incorrect structural material such as wrongly graded timber,
actual design failures are very rare and represent only about
4% of all roof structure failures.
Especially when building alterations are made, such
“The reason for this low risk is that most modern roof
structures of timber or light gauge steel are designed with
the help of sophisticated design software, which almost
eliminates the possibility of failure,” explains Schlüter. “Only
incorrect input of data could still cause failure.”
as load changes when ceilings are modified or new airconditioning units are installed. “A timber roof is probably
more susceptible to such changes than a concrete or steel
roof since one can take out a structural member with a simple
saw,” Anderson explains.
“I also believe that to an extent, sometimes the
Inspections are crucial
architectural design or engineering concepts of the building
In line with the NBR, where a rational design is used, a
timber roofing are pushed too far.
professional competent person must be appointed to carry
out the design, Schlüter points out. “The roof inspection also
forms an important part of the design process and therefore
the complete design must be inspected and signed. Even
roofs built in accordance with the deemed-to-satisfy rules of
the NBR should be checked for compliance by the architect,
owner or building inspector. Sadly this is often not done,
which is why we get roofs that fail,” he says.
58
is incorrect, for example when the practical constraints of
He adds that building owners and constructors must
engage with specialists in the industry to understand what is
practically achievable and safe over the long term and each
roofing project should be assessed on its own merits.
Penny wise, pound foolish
“We see a lot of roofs in the domestic housing market which
Dave Anderson, managing director at Hi-Tech Nail Plate,
are failing because they haven’t been correctly designed and
agrees. “Building owners need to adhere to the regulations
erected in the first place. More often than not the building
where buildings need to be inspected on a regular basis,
owner hired an unskilled person from the street to install the
which generally doesn’t happen.”
roof rather than following a properly engineered solution,”
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59
roof ing & cei l i ngs
Anderson states. “The latter might even turn out to be the
more economical route from the start because a proper design
and calculated connections might require less timber.”
He notes that a timber roof is probably the most
economical in terms of cost compared to a concrete or steel
roof. “If the risk is managed, and it is done practically within
the constraints and bounds of timber roofing, a timber roof
truss is a very safe and simple solution,” says Anderson.
Fred Wagenaar, Executive Officer of the Institute
for Timber Construction in South Africa (ITC-SA), stresses
the importance of using a reputable product and service
provider.
He references an incident where a consumer had to
incur the cost of removing and replacing a faulty timber roof
structure after an ITC-SA inspection found that the roof was
Southdowns Shopping Centre. Courtesy of Hi-Tech Nail Plate.
badly erected and was manufactured with components that
weren’t tested in accordance with industry standards.
In another instance, during a routine inspection an ITCSA roof inspector stumbled across timber that was used as
structural timber in the manufacturing of an in-situ built roof
structure in an upmarket residential home. The timber was
marked as structural S5 as per the SANS specification, but
it did not comply with any mark specifications. In addition,
membership transgressions. The body also provides assistance
to the statutory regulators in the investigation and exposure
of fraudulent practices.
“Quality control together with proper risk management
should be the order of the day,” states Wagenaar. “For those
who do not comply there will be no room in the industry.”
the finger jointing of the structural members was inferior
and non-compliant. Although the necessary structural and
compliance markings were present, they were fraudulent and
Reasons for failure:
done by a self-made stamp.
• Poor roof truss erection/construction.
“The built environment should not allow this lack of
integrity and un-consequential trading in our industry,”
Wagenaar states. “We cannot tolerate this behaviour. We also
need to consider the financial and reputational consequences
• Installations by unskilled constructers without
proper designs.
• Modified roofs.
• Incorrect manufacturing.
on the industry that we serve.”
• The use of inappropriate structural material such
as low-grade timber.
R o l e o f t h e I TC - SA
The ITC-SA actively works towards exposing fraudulent
practices and rescinding the effects and consequences of
60
bad industry practices on consumers, its industry partners
Full thanks and acknowledgement are given to the Institute
and ITC-SA accredited members that do comply. Internally,
for Timber Construction, MiTek and Hi-Tech Nail Plate for the
it has a defined Code of Professional Practice and deals with
information given to write this article.
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61
roof ing & cei l i ngs
Light weight construction
solutions to be showcased
Marley Building Systems will launch its brand new construction portfolio, featuring the latest fibre cement
and lightweight construction solutions, at this year’s Africa Construction Expo to be held in May.
“
e are constantly engaging with our target
concrete roof tiles deliver a varied range, suitable for modern
audience through various platforms, and
and traditional designs.
are reaffirming our position as a leader
in the supply of building components
through the incorporation of leading international products
Kalsi
and brands in our portfolio,” explains Sean Singh, commercial
Kalsi Fibre Cement materials stand for health, durability and
manager at Marley Building Systems.
quality. Produced without asbestos fibres, these products
The African Construction Expo is a one-stop shop to
showcase experience and learn about the latest building
and construction methods, products, tools and technologies
appropriate for the African continent.
Marley
Building
are world-renowned for their straightness, flexibility and
ease of installation. Kalsi products are used as part of a
dry-construction system in the commercial, residential and
industrial markets.
Systems
offers market-leading lightweight
Siniat
dry
A global brand of plasterboard and
carry
construction
a
solutions
combination
of
that
eco-
drywall systems, Siniat products are
friendly materials, surpassing all
available in South Africa as part of
performance requirements. Aimed
at
maintaining
quality
the Marley Building Systems offering
while
of drywall construction, backed by
remaining cost-effective, its range
more than 25 years of experience.
of aesthetics through wall systems
The company continually invests in
adheres to international standards.
technology combined with highquality materials to produce drywall
“It is our objective to influence
products of the highest quality
the future of the South African
building industry through supplying
Bridge Learning Centre
that meet both international and
national standards.
products and services that not only
redefine building methodology, but
also give our clients complete peace
Equitone
of mind,” Singh adds.
The
Equitone
through-coloured
facade materials are designed by
The marley
Building Systems
portfolio includes
t h e f o l lo w i n g
brands:
and for architects. Every Equitone
panel is unique, showing the raw,
untreated texture of the fibre
cement base material. No matter
what design options are explored,
the through-coloured nature of
2004 Regional Award
Equitone adds crisp, monolithic
Marley Roofing
details to any facade.
With many years of working with some of South Africa’s
leading roofers and providing a vast range of roofing products,
62
Marley Roofing offers a wide range of concrete and clay tiles,
Marley Building Systems
as well as the more modern fibre cement slates. Outstanding
Tel: 011 316 2121
aesthetics and precision engineering of Marley Roofing’s
Website: www.marleybuidingsystems.co.za
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63
roof ing & cei l i ngs
Application: A residential house in Zimbali.
Multipurpose
ceiling boards
in a size that makes sense
Pelican Systems launched an industry first 1m wide multipurpose ceiling board in 2013. Despite the
challenge of a well-established market of 900mm and 1 200mm widths, the sales volume of the 8mm x 1m
Tapered Edge JUMBO Boards totalled 253 000m² in February 2015.
W h at m a k e s t h i s p r o d u c t
u n iq u e ?
metric size, and huge savings can be made by manufacturing
It is the…
standardisation of one width simplifies material take-off
• First metric plasterboard distributed in South Africa.
• First thin board manufactured with a tapered edge.
The 1m wide board gives one standard option in a truly
and stocking less of a product range. In addition, the
and ordering, which in turn improves on-site efficiency and
reduces wastage.
• First multipurpose plasterboard in the industry.
• First full skimmed ceiling board to be fixed at 500mm
centres.
W h y b r i n g a 1 m b o a r d to t h e
lo c a l c e i l i n g m a r k e t ?
South Africa converted to a metric measurement system more
64
W h y d o e s t h e 8 m m b o a r d h av e
a ta p e r e d e d g e ?
With a tapered edge, the finish can either be a taped and
jointed ceiling or one with a full skim. The tapered edge
also
facilitates
the
board
being
used
for
bulkhead
construction.
than 40 years ago and yet the market is still dominated by
If a wide cover strip is used to cover the paper-fold mark
900mm and 1 200mm wide boards, adopted from 3ft and 4ft
on the underside of the board, the 8mm board can also be
imperial measurements.
used in an application that would normally use an H-strip.
Jo u rn al 3 • Apr i l/May 2 0 15
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J ou rn a l 3 • April/Ma y 201 5
65
roof ing & cei l i ngs
Application: Summer View.
Problem-solv ing
properties:
For contractors
• Simplified material take-off and ordering process
saves time and errors.
• Improved truck utilisation since 1m boards lie flat
in the bin of most bakkies.
I s i t p o s s i b l e to u s e o n e
product for all ceiling
a p p l i c at i o n s ?
• Easier on-site planning, handling and storage.
Yes, instead of ordering a 6.4, 7, 9 or a 9.5mm ceiling board,
• Reduced labour required for on-site installation.
the 8mm JUMBO TE board can be used for all fixed ceiling
• Boards are marked for correct screw placement.
• Less material is used (fixed at 500 centres).
• Less on-site waste due to re-useable off-cuts
(environmentally friendly).
applications including flush plaster grid, steel and timber
brandering and bulkhead construction.
While it would make sense to convert to only one
thickness of ceiling board, being 8mm x 1,0m, thereby
simplifying the ceiling board space from about 12 SKUs to 2
• Less breakages and damage from easier handling
SKUs, the local ceiling industry is hesitant. Therefore Pelican
Systems has also made a 7mm square edge board available
and storage.
in 1m widths.
For distributors and merchants
• All ceiling systems can be supplied with fewer SKU
items.
• Improved export/import – better utilisation of
container space with all boards able to lie flat in
the container.
per pallet, operations and logistics are improved.
warehouse
This ground breaking product, a vision Pelican Systems
founder, Rodney Gould, has proved its potential for success.
Gould, who is passionate about the building industry, believes
that this innovation for metric ceiling boards creates benefits
for all role-players in the industry, including the architects,
• Stocked on steel Easy-Mover pallets with 100 units
• Improved
Why change?
utilisation
and
rental
quantity surveyors, distributors, merchants, developers,
ceiling contractors and installers, as well as the customer
through savings in time, money and waste.
savings.
• Reduced breakages and damage from easier
handling and storage.
66
Jo u rn al 3 • Apr i l/May 2 0 15
Pelican Systems
Tel: 031 563 7307
Website: www.pelican.co.za
w w w. w a l l s a n d ro of s . c o . z a roofing & ceilings
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
67
roof ing
Hospitalit y:
Hotel Verde
S u s ta i n a b l e R o o f i n g :
Sol ar Reflectance technology of steel roof material proven
With its Clean COLORBOND™ steel roof, Hotel
Verde is one of the most sustainable hotels in
the world. © Gareth Griffiths Imaging
opular roofing material, Clean COLORBOND™ steel
the world, the Hotel Verde near Cape Town International
with Thermatech™ solar reflectance technology
Airport. It was the first hotel in Africa and the first
coating, has proven its proficiency for both new
South
builds and refurbishments.
certification across all categories of LEED Platinum
Two case studies, in the hospitality industry and a
major convention centre respectively, demonstrate the
aptness of this material for any sustainable building.
African
building
to
achieve
a
platinum
Design and Construction Certification.
According to the engineer and lead sustainability
consultant on the project, André Harms of Ecolution
Consulting, the hotel boasts a high Solar Reflectance
H ot e l V e r d e – a s u s ta i n a b l e
landmark
Index (SRI) roof which contributes greatly to its very low
heating and cooling energy usage.
“We had the opportunity to change the status quo
Clean COLORBOND™ steel was specified for the
there and looked at different ways of doing everything,
construction of one of the most sustainable hotels in
right from the word go,” states Harms, a trained
C a p e To w n
I n t e r n at i o n a l
Co n v e n t i o n
Ce n t r e
Clean COLORBOND™ steel is making a major
contribution to the style, performance and
longevity of roofs in South Africa.
Photography by: Subiaco
68
Jo u rnal 3 • Apr i l/May 2 0 15
www.wa lls a n droof s . co . z a
r o ofing
electro-mechanical engineer who provided the
Uninsulated
expertise behind many of the high-tech aspects
Clean
Roofing material
of the building, collaborating closely with the
COLORBOND™
project architects, Heinrich Gerstner Harding
Architects.
The crowning glory of the Hotel Verde,
its roof, consists of 1 510m 2 of exposed sheet
metal roofing plus a further 255m 2 which is
covered by PV panels. The roofing material
is Clean COLORBOND™ Ultra steel with
Thermatech™ solar reflectance technology
Uninsulated
Conventional
Steel Roof
Steel Roof
Roof sheet
Unexposed
56,0
56,0
Temperature °C
24 months exposure
62,9
72,3
Radiant heat
Unexposed
80,3
80,3
Downwards – W/m²
24 months exposure
110,3
154,0
Clean COLORBONDTM steel’s dirt resistance also assists in cooling.
coating to specification AZ200 (TCT 0,53mm)
and colour Enduring White. The Solar Reflectance Index (SRI) is
outstanding dirt resistance property ensures the roof looks
85, making this one of the coolest operating roofing materials
newer for longer. This also assists in cooling.”
available, complimented by an outstanding dirt resistance
property which ensures the roof stays cooler for longer. The
roof was installed in profile Brownbuilt Klip-Lok 406 by the
roofing contractor, Scheltema.
In a comparison between a Clean COLORBOND™ steel
and a conventional steel roof, both uninsulated, the positive
effect of dirt resistance technology is illustrated. Tests show
that after two years’ exposure, assuming an irradiance of
The SRI value is widely used by green building rating tools
1 000W/m², an exterior temperature of 36°C and a high thermal
to mitigate the Urban Heat Island (UHI) effect. It incorporates
emittance value of 0,86, typical of pre-painted steels, the Clean
both solar reflectance and thermal emittance to represent a
COLORBONDTM steel roof ’s temperature is almost 10°C cooler
material’s temperature in the sun and quantifies how hot
than the conventional steel roof and it radiates more than
a surface would get relative to standard black and standard
40W/m² less heat down into the building. This is a considerable
white surfaces. In hot tropical climates, low thermal mass
easing of the HVAC load for any building, regardless of size.
materials such as steel with light-coloured roofs and walls can
be used to reduce energy demand for internal cooling.
According to Wayne Miller, general manager of BlueScope
Bluescope Steel Southern Africa (Pty) Ltd
Tel: 021 442 5420
in Southern Africa, the solar reflectance technology found in
[email protected]
Clean COLORBOND™ steel lowers the surface temperature by
Website: www.bluescope.co.za
absorbing less heat from the sun.
“Thermatech™ optimises the thermal performance of
every colour in the standard Clean COLORBOND™ steel and
Clean COLORBOND™ Ultra steel palettes, without changing
their appearance. This provides greater thermal comfort all year
round whilst using less energy for air-conditioning and hence
mitigating the UHI effect,” he says. “In addition, the product’s
The original Cape Town International Convention Centre (CTICC) project was a design association with Foreshore Architects Revel Fox and Partners, Van Der Merwe Miszewski Architects, Lucien le Grange Architects, SV Architects, DHK Architects, ACG
Architects and Magqwaka Architects.
Clean COLORBOND™ steel provides the architect with the option to specify an excellent quality pre-painted steel roofing
material which offers a high resistance to the paint breakdown and corrosion typical of the extreme African climate.
Suitable for use in humid, windy and salt-laden marine environments, such as those found near Cape Town’s harbour, the
performance of the original COLORBOND® steel product used at the CTICC is an excellent showcase for the product. The brilliant
white COLORBOND® steel installed over 12 years ago keeps its colour and reflects a substantial quantity of inbound solar.
www. wa l l s an d ro of s . c o.za
J ou rn a l 3 • April/Ma y 201 5
69
roof ing & cei l i ngs
15 Years of
manufacturing
roof trusses –
a proud milestone
With nearly 15 years of manufacturing lightweight
steel and treated timber roof trusses behind them,
Dezzo Roofing has extensive experience in all types
of roof designs.
he company was established in 2000 by Brandon Harding
and Senzo Mfayela with the main focus on manufacturing lightweight steel roof trusses for the government’s
reconstruction and development programme (RDP) and
the low-cost housing market. In 2002, Dezzo Roofing started
Dezzo Roofing manufactures treated timber roof trusses for a wide
range of projects.
Dezzo Roofing makes use of International Truss System
(ITS) design and machinery. This includes fully integrated
software and access to world-class manufacturing equipment.
The Institute of Timber Construction (ITC) also audits the
company on an annual basis to make sure that its standards
are always at their highest.
E s t i m at i n g s e r v i c e
Dezzo Roofing has two full-time, in-house estimators/
designers who are certified by ITS. The company is able to
offer design drawings in plan and 3D format for all projects.
Fully integrated software and world-class equipment are used in the
manufacturing of lightweight steel and treated timber roof trusses.
manufacturing treated timber roof trusses, also initially meant
for RDP houses, but it soon grew and the company now focuses on the middle to upper income residential market as well as
schools, office blocks and smaller commercial requirements.
Dezzo Roofing envisions to:
• Be the market leader in timber truss manufacturing.
• Build a brand synonymous with quality.
With its proven track-record, Dezzo Roofing is able to provide
technical support for all roof designs, with additional support
from ITS South Africa when necessary.
Roof covering
To round it off, Dezzo Roofing supplies roof tiles from Infraset,
Marley Roofing and Monier Roofing. Its fibre cement products
are supplied by Everite and its steel profiled sheeting comes
from Clotan Steel in Gauteng.
• Provide the best service possible.
Dezzo Roofing
• Ensure stringent application of ITC principles.
Tel: 031 713 6571
• Be an employer of choice for staff members.
70
Technical support
Jo u rn al 3 • Apr i l/May 2 0 15
Email: [email protected]
Website: www.dezzoroofing.co.za
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J ou rn a l 3 • April/Ma y 201 5
71
roof ing & cei l i ngs
Sasfin building in Gauteng using
COLORPLUS® Slate 0.58 profiled in
Pro Roof’s Prolok 700 concealed fix.
The science behind
cool roofs
s mean temperatures continue to rise alongside rock-
reflectivity (owing to its dark colour) and higher thermal
eting energy (read cooling) costs in South Africa, savvy
mass (owing to its greater density and higher insulation
architects, builders and property owners are looking
properties).
at new-generation roofing materials to aid them in reducing the heat load in buildings.
Steel is an obvious choice, with its high solar reflectivity
colour. In general, colour-coated steel also performs far better
and low thermal mass (tendency to absorb and retain heat
than traditional roofing materials such as concrete or clay tiles
energy). Innovative aluminium-zinc (AZ) coating technology
(which have dismal SRIs of 17 and 36 respectively).
such as Safal Steel’s has ramped up the durability and versatility
of steel sheeting, while a pre-painted option provides roofing
durability, ease of maintenance and good looks.
With darker colours being less heat-reflective, it may be
logical to think that a dark tint on colour-coated roof sheeting
will cancel out the material’s superior thermal performance.
But how does colour-coated steel perform thermally
However, leading producers of colour-coated steel are turning
compared to a conventional steel roof or other building
to science to produce thermally efficient paints that mitigate
materials?
the low reflectivity of dark colours.
U n d e r s ta n d i n g t h e S o l a r
R e f l e c t i v e I n d e x ( SR I )
T h e r m a l ly e f f i c i e n t pa i n t
To calculate a constructed surface’s ability to reflect solar
thermal performance of colour-coated steel and improve
heat, the SRI takes into account a roof ’s solar reflectance (the
durability in terms of gloss, colour stability and film integrity.
proportion of total solar radiation that is reflected back into
Safal Steel has recently introduced such a paint system in
the atmosphere), plus its thermal emittance (the proportion
the two darkest colours, “Slate” and “Thunderstorm”, in its
of absorbed solar radiation that is radiated back into the
COLORPLUS® range.
atmosphere) as well as a medium wind coefficient to generate
a value of between zero and 100.
72
Interestingly, unpainted metallic-coated steels have a
lower thermal emittance than painted ones, whatever the
Heat-reflective pigments in darker paint colours raise the
Safal’s COLORPLUS® range is produced by continuously
hot-dipping rolled steel in a 55% aluminium, 43,5% zinc and
A black shingle roof will hence have a far lower SRI than
1,5% silicon alloy, then skin-passing it for the colour-coating
a white-coated steel roof because of the former’s far lower
line, where it is coated with a two-layer modified polyester
Jo u rn al 3 • Apr i l/May 2 0 15
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paint system and baked. Manufactured under licence to BIEC
COLORPLUS®
COLOURS
TOTAL SOLAR
REFLECTANCE
THERMAL
EMITTANCE
SOLAR
REFLECTANCE
INDEX
boasts properties that make it long-lasting and aid its heat
Seaspray
65%
0.85
78
reflectivity, such as anti-chalking, fade-resistant pigments
Chalk
68%
0.85
81
and particle resistance.
Savannah
58%
0.85
68
Desert Sand
51%
0.87
58
Sunset Red
34%
0.84
34
Rustic Bark
26%
0.83
24
Rain Forest
30%
0.83
29
Deep Ocean
29%
0.83
28
Rain Cloud
32%
0.83
32
Slate
29%
0.88
30
Thunderstorm
25%
0.84
23
lnternational lnc., the worldwide licensor and acknowledged
leader in AZ technologies, Safal’s COLORPLUS® range
Advantages of thermally-efficient paint systems include:
• A cooler building.
• A cooler city with less of the discomfort and environmental
implications associated with urban heat islands (UHIs).
• Reduced costs, both in terms of air-conditioning equipment
needed and operational costs.
• Reduction of environmental impact in terms of heat
generation and energy requirements for cooling.
•The results reported have a measurement uncertainty of +- 5 units.
•Colours reproduced here may not be completely accurate.
•Slate and Thunderstorm: New Thermo efficient paint system.
The superior reflectivity and durability of Safal’s colour
coating system, including the paint technology on its darker
colours, coupled with competitive pricing, top-notch quality,
ultraviolet (UV) resistance and corrosion resistance, hardness
and flexibility, make COLORPLUS® an ideal product for local
South African conditions.
www. wa l l s an d ro of s . c o.za
Safal Steel
Tel: 031 782 5500
Website: www.safalsteel.co.za
J ou rn a l 3 • April/Ma y 201 5
73
roof ing & C ei l i n gs
INGENIOUS CEILINGS
Photo courtesy of Saint-Gobain.
1
A r m a d i l lo - s t y l e c e i l i n g
The ceiling above the food and entertainment area in the Cradlestone
Mall was designed by Bentel Associates to contour plasterboard systems
into the unique, jagged shape of an armadillo-style roof, framed by threedimensional bulkheads that lend the mall an angular expression. The high
An interesting ceiling design can
aesthetic specification of the finishes exposed to extreme light is coupled
liven up a space and create a certain
with great acoustic performance.
feel in a room or an entire building.
Not necessarily always first on the
list of priorities when it comes to
interior fit-outs, ceilings expand the
scope of interior building design.
Here is some inspiration:
2
D r a m at i c
bulkheads
In an upmarket Zimbali home,
Intersect Architects made full use
of the ceiling as a design feature
with bulkheads and floating
ceilings creating dramatic effects
within this magnificent home.
To create more lighting under
a concrete bridge, a bulkhead
made from multipurpose ceiling
board and specialist trims was
custom-designed as a feature.
Photo courtesy of Pelican Systems.
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3
Va u lt e d c e i l i n g
4
C e i l i n g t i l e s i n s ta g g e r e d
design
A vaulted ceiling constructed out of strong and flexible plasterboard, makes the space look larger than it is and helps to
add a lot of light to the home.
The Overport City Shopping Centre’s high-volume ceilings
consist of perforated ceiling tiles with an excellent fire
performance rating of A/A1/1. The staggered design
coupled with greenery makes for a refreshing feature.
7
U s i n g wa l l pa p e r a s a c c e n t
Although fairly simple in design, decorative ceiling
designs such as in this Morningside residence create
interesting features accentuated with lighting. The elegant
black and white wallpaper used on the ceiling recess,
5
coupled with decorative cornices, creates a beautiful
E x pa n d e d m e s h c e i l i n g
With light fittings installed behind an expanded
mesh ceiling, the Office for Collaborative Architects
feature that is both striking and yet easy to achieve.
Photo courtesy of Pelican Systems.
(GAPP + MMA + MRA) achieved a subtle bleed of diffused
light without exposing the fittings, ideal for the café area
at Freedom Park Museum. Behind these metal mesh tiles,
mechanical and electrical services are exposed above the
lighting within the void and the concrete soffit insulation
is covered by a black sonic liner.
Photo courtesy of GAPP Achitects.
6
8
A c o u s t i c a l ly s o u n d
The new Rewardsco building is a landmark green
building for Umhlanga Ridge. Its light and airy interior
features perforated gypsum board ceilings together with
100mm insulations that create both an appealing look as
well as excellent acoustics.
Li n e a r m e ta l s t r i p t i l e s
Linear metal strip tiles are all about the looks and at
the Bridge City Rail Commuter Station, it combines well with
the typical subway tiles. Installed by suspending a carrying
channel with threaded rods, the aluminium metal strips just
lay into that system.
Photo courtesy of Capco.
9
M e ta l t r ay t i l e s
Unaffected by humidity and enamelled with
polyester epoxy powder for surface protection, the
To view a video of Ouchhh’ 3D motion
mapping show, scan here.
www. wa l l s an d ro of s . c o.za
metal tray ceiling tiles installed at Durban International
Airport is dust-resistant and very low maintenance.
J ou rn a l 3 • April/Ma y 201 5
75
roof ing & cei l i ngs
10
Working with wood
For a naturally beautiful, but functional finish, a
solid wood grid ceiling, curved with vertically positioned
slats was installed in the Innes Chambers building in
Johannesburg. Using a proprietary fixing system, the
ceiling is demountable in sections to provide easy access
to the plenum. Consisting of medium-density fibreboard
(MDF) covered with genuine wood veneer, the wood panels
also meet local fire-rating requirements.
Photo courtesy of Hunter Douglas.
13
P l ay f u l
ceilings
In tune with the function of
the space, the ceiling of the
kids club at Virgin Active Ballito
was designed with floating
bulkheads that tie in with the
colour palette of the room.
Photo courtesy of Pelican Systems.
11
Acoustic foam ceilings
At the Betty T Ferguson Recreation Centre in Miami
Gardens, Florida, the ceiling was decorated with lightweight, acoustic, class A fire-rated expanded melamine
foam tubes that represent pool noodles.
The multi-
coloured layout was suspended with a steel stretched
cable system from an aluminium frame at various heights
to create a three dimensional sound wave effect.
Hanged from eye hooks, fireproof melamine foam
rondos make for eye-catching ceiling designs and can
be installed either vertically or horizontally. Selected
14
Set the mood
Using black inlay ceiling tiles with acoustic
properties, Design Line Architects and Elphick Proome
Architects designed a practical ceiling which allows
for easy access to services. Combined with starlights,
it creates a relaxing atmosphere apt for the Mind/Body
Studio at Virgin Active Ballito. The ceiling tiles also have
an inherent stiffness which allows for installation of the
fixtures without the need to install backing boards.
primarily for their exceptional acoustical properties, they
dramatically reduce noise and eliminate echoes. What’s
more, they are UV resistant and unaffected by heat and
humidity.
15
U lt r a m o d e r n
homeomorphism
A 3D motion mapping and light projection exhibition
Photo courtesy of West General
by Turkish design studio, Ouchhh, maps out continuous
transformations of circular and geometric shapes on
12
the ceiling of a darkened dome. Made up of infinitely
Clever contrast
The ceiling over the Kauai at Virgin Active Ballito
repetitive patterns, spectators find it visually and aurally
mesmerising.
was designed as a floating bulkhead that is offset against
the charcoal painted soffit and services. This design
Full thanks and acknowledgement are given to GAPP
allowed the suspended LED strip lights to float and cut
Architects, Saint-Gobain Gyproc, Pelican Systems, Hunter
into the surrounding bulkhead of the lounge.
Douglas, Capco and Ouchhh for the information given to
write this article.
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The circular roof of the iconic BMW office in Midrand was completed with
high-performance products from Sika.
Moisture-triggered
c h e m i s t r y a d d e d to
i co n i c b u i l d i n g
Three high-performance products from Sika’s Moisture-Triggered
Chemistry (MTC) range were specified for the completion of
the newly renovated BMW office building contracted to Barrow
Construction. Situated on New Road, Midrand, this completely
circular structure has become an iconic landmark.
Sikalastic-601 BC (base coat) and Sikalastic-621 TC
(top coat) were applied to the exposed concrete flat roof of
approximately 900m2, while Sikafloor-405 was used in all the
air-conditioning plant rooms, covering an area of approximately
300m2.
Both Sikalastic-601 BC and Sikalastic-621 TC are coldapplied, one-component, moisture-triggered polyurethane
coatings designed for easy application. Their fast curing ability
provides rapid resistance to rain damage, while their high
elasticity provides a crack bridging, seamless waterproofing
roof membrane. In addition, they are vapour permeable with
strong resistance to common atmospheric chemicals and both
emit low odour during application. Sikalastic-621 TC is also
ultraviolet (UV) stable.
These products are ideally suited for use on roofs that
display complex detail areas, even when accessibility is limited.
What’s more, they provide a cost-efficient lifecycle extension
for failing roofs and their reflective qualities enhance energy
efficiency by reducing cooling costs. Working to a tight time
schedule, sub-contractors Quake Seal applied Sikalastic-601
BC as a base coat on all the plant room floors, after which
Sikafloor-405 was applied as a topcoat.
Sikafloor-405
is
a
one-component,
pigmented,
polyurethane resin coating with moisture-triggered curing.
It is highly elastic with excellent adhesion ability and its
crack bridging and UV-resistant properties make it an ideal
waterproofing product for numerous interior and exterior
applications. Furthermore, it is resilient against abrasion, slipresistant and suitable for coating concrete, cementitious screed
substrates as well as tiles.
Heavy rains challenged the project for almost an entire
month. However, thanks to the efficacy of Sika’s worldrenowned products and a unique timing schedule, the project
was completed well within the stipulated time frame.
Sika
Tel: 031 792 5600
Website: www.sika.co.za
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roof ing & cei l i ngs
Discover a new kind of
“sustain-abilit y”
at 2015 roadshow
Following its resoundingly successful “Metal Roofing Innovations”
roadshow in 2013, Safintra is hosting a similar event in May 2015.
This year, the theme is “Sustain-Ability: Be the Change” with the focus
on materials, roofing systems and technologies that have dramatically
improved the performance of metal roofing and cladding.
he roadshow will visit Johannesburg, Cape Town and Durban, with follow-up presentations held in Port Elizabeth,
Bloemfontein, Nelspruit and Polokwane during June,
July and August. All these events are CPD-accredited.
A highlight on this year’s programme is international
guest speaker, Rob Haddock, who will personally present at the
S o l a r i n t e g r ato r w o r k s h o p s
Running concurrently with the roadshow, solar integrators and
photovoltaic (PV) panel installers will have the opportunity to
attend solar integrator workshops. Having invented the S-5
range of patented clamps, Haddock will discuss solar panel
installation using these clamps and components.
larger 3 events. Globally, metal roofing is leading the charge
for sustainable change and of the individual change agents
and thought leaders, few are as prominent as Haddock.
S-5 clamps offer significant
cost and lead time savings
Industry expert: Rob Haddock
As the founder and director of the Metal Roof Advisory Group
of the USA, Haddock is a well-recognised authority on metal
roofing, a technical writer for many trade publications, a trade
curriculum author, inventor and educator.
He annually speaks at the Metalcon International Trade
Conference and Exhibition in the USA, and his presentations
have been rated number one from a field of up to 52 offered
seminars for 24 consecutive years.
He further teaches at the University of Wisconsin, Florida’s
Association of Roofing Professionals (FRSA), the National
Roofing Contractors Association (NRCA), RCI Incorporated and
others. Haddock’s technical writings have been translated into
five different languages and he has lectured in at least eight
countries to producers, contractors, designers, specifiers and
end-user groups.
S-5 clamps offer significant cost and lead time savings
over most other mounting systems. They are warranted for
the full service of the roof and the panels, and offer structural
performance that is well in excess of engineering requirements
for weather and structural stresses. Safintra distributes
the S-5 range of patented clamps throughout Africa on an
exclusive basis.
The workshop will explore installation detailing and
technical aspects of roof-mounted solar installations and the
positive impact of fast installation on site.
This subject is highly topical in South Africa as Eskom
moves to increase off-grid capacity and to encourage private
participation in energy co-generation.
Safintra is a pan-African metal roofing manufacturer
and is part of the largest metal roofing company in Africa,
called the Safal Group. It is a market leader in offering metal
For his contributions to the roofing industry, Haddock has
received numerous awards, including:
roofing systems and solutions which have made metal roofing
a preferred choice for building owners and professionals in a
green-focussed industry.
• 2012: Inaugural inductee to the Metal Construction
Hall of Fame.
Safintra South Africa
• 2015: Larry Swaney Award for contributions towards
the furtherance of the metal construction industry of
Tel: 011 323 6300
Website: www.safintra.co.za and www.safintra.com
North America.
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Safintra roof profiles on display at the Innovations
Roadshow in Johannesburg in November 2013.
Roadshow dates:
Johannesburg: Thursday, 14 May 2015, and Friday, 15 May 2015.
Cape Town: Monday, 11 May 2015 • Durban: Wednesday, 13 May 2015
Follow-on presentations:
Port Elizabeth: Thursday, 2 July 2015 • Bloemfontein: Tuesday, 4 August 2015
Nelspruit: Thursday, 11 June 2015 • Polokwane: Thursday, 4 June 2015.
All events are CPD-accredited.
Delegates at the Safintra Innovations
Roadshow in Cape Town during October 2013
were captivated by the speakers.
The Safintra Innovations Roadshow in 2013 also provided valuable networking opportunities.
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roof ing & cei l i ngs
Insul ation:
Specifying the whole package
Specifying insulation is often a challenge faced by construction professionals because
of the fact that the selected product must be able to withstand point loads, as well as
encompass the necessary insulation properties.
he benefits of fitting proper insulation in buildings go
Closed hollow glass beads make up the bulk of the
beyond just saving energy, to also include acoustic ad-
50mm-thick insulation screed and are held together with
vantages and the ability to achieve sustainable building
a combination of high-strength polymer modified cement,
standards and ratings.
topped with iTe’s F30 LeveliTe self-levelling floor screed. This
is used to penetrate the top 10mm into the sandwich. The
U n d e r s ta n d i n g i n s u l at i o n
va l u e s
topping of 25Mpa is used to distribute point loads that are
To get the specification right, one must first understand what
aesthetic appeal together with having a solid feeling floor.
placed onto the floor. Any floor covering can then be applied
over the self-levelling floor screed to achieve the desired
insulation and thermal conductivity actually are. The thermal
conductance of a material is measured as (W/m²K), with the
U-value referring to a material’s ability to conduct heat, while
the R-value (m² K/W) measures the ability to resist heat flow.
The higher the U-value, the more heat can pass through
a certain material. A lower value would therefore indicate
a better insulator (SANS 204:2011). The values of different
materials (as set out in the table) put it into perspective.
A n i n s u l at i o n s a n d w i c h
With a U-value of only 0,13, iTe Products’ INSULiTe® flooring
insulation system has an insulation property equal to that of
soft timber. The system consists of different materials making
up an insulation sandwich that also has very good loadbearing characteristics.
Any floor covering
can be applied over the
self-levelling floor screed
to achieve the desired
aesthetic appeal.
INSULiTe® is perfect for applications where under-floor
heating needs to be installed due to the fact that only the top
10mm of the self-levelling floor screed will be heated by the
under-floor heating application, while the excess heat that is
generated will be radiated into the room. This dramatically
improves the heating process compared to conventional
methods, where a huge amount of heat
is lost into the concrete surface bed
and ultimately into the sub-base of the
concrete.
iTe Products is a one-stop shop for
flooring insulation solutions required
to achieve high thermal comfort levels,
while simultaneously offering the loadbearing performance benefits that are
expected of durable flooring materials.
Insulite
Tel: 011 864 4918
Fax: 011 864 2123
Email: [email protected]
Website: www.iteproducts.co.za
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roof ing & cei l i ngs
Simple, clever
sustainabilit y
Pa r t 1 : Si t e - a s s e m b l e d m e ta l r o o f s y s t e m s
f o r to p t h e r m a l p e r f o r m a n c e
Steel is one of the ultimate building materials for
sustainable buildings – it is light, very strong, longlasting, design versatile and can be fully recycled.
Where required, the acoustic performance of the
cladding, in particular its ability to absorb internal sound and
minimise reverberation, may be enhanced by the use of a
perforated liner sheet.
Thinner gauge liner sheets are not strong enough to walk
This article is part of a series on metal roofing and
on, so it is essential that the insulation, spacer system and
cladding systems that promote sustainability.
weather sheet are installed from access panels. Access panels
metal roof system made up of a series of everyday
components can outperform almost any alternative
system for bespoke and specific thermal properties.
Site-assembled systems are built up from their constituent parts on the building site and critically, this system can
be used for a new build as well as a retrofit over an existing
are thicker profiled steel sheets with the same profile as the
liner and can be equipped with adhesive non-slip strips. These
are loose laid and nested over the liner sheet and used as a
platform, shifted along the roof plane as work progresses.
Whether trafficable or not, the steel liner sheets provide
an excellent, non-fragile barrier against falling once they have
been fully fastened.
metal roof.
The Safintra-warranted assembly combines best of
breed components to create a system which will perform for
decades.
It consists of a steel liner sheet of aluminium-zinc coated
steel, a layer of insulation material, the Ashgrid bar and
bracket spacer system, and an outer profiled weather sheet,
also in aluminium-zinc coated steel.
Liner sheet
Site-assembled system:
1.Weather sheet
T h e s pa c e r s y s t e m
2.Ashgrid Bar and bracket
The primary function of the spacer system is to support the
3.Insulation
weather sheet at the required height above the liner sheet. The
4.Liner sheet
components of the system must therefore possess sufficient
5.Purlin
strength to safely transmit the required loading through to
the primary purlins, without deformation.
The Ashgrid bar and bracket system consists of steel
bars, which provide continuous support to the weather sheet,
supported at intervals by steel brackets firmly attached to the
Li n e r s h e e t s
purlins through the liner. The bracket foot must incorporate
Liner sheets are simply profiled sheets of aluminium-zinc
coated steel with a trapezoidal profile and a thickness of
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an EPDM pad, which acts as a thermal break, to minimise
thermal bridging.
anything from 0,3mm to 0,55mm. The thickness of the liner
It is important to note that in the absence of an
sheet will depend on the traffic it is required to handle, and
engineered spacer system, the structural integrity of blanket
the acoustic requirements of the cladding.
insulation or rigid insulation boards installed over purlins
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roof ing & cei l i ngs
is entirely reliant on the roofing fasteners and packers.
The design lengths of the fasteners are often excessive whilst
the insulation and packers do not offer them adequate
support. This places the entire roof assembly at risk.
Benef its of bu ilt-up
systems
• Cost-effective.
• Lightweight and fast method of construction.
• Secure and waterproof at an early stage of the
build programme.
• Efficient: R-values up to 7m².K/W, and offers
consistent thermal performance for the life of the
building.
• Improved structural performance: The liner sheet
and Ashgrid bar and bracket spacer system provide
restraint to the steel purlins, thus ensuring rigidity
Liner sheet with bar and bracket system.
of the roof structure. • Glass fibre and mineral wool deliver an A/A1/1 fire
rating with no restrictions.
• The acoustic performance far exceeds that of
rigid insulation boards installed over purlin and
eliminates rain drumming.
I n s u l at i o n
• Improved security due to a second steel skin.
Glass fibre or mineral wool blankets are favoured due to their
• Recyclable
and
reusable:
As
the
individual
light weight, low thermal conductivity, acoustic performance
components are not bonded, recycling of the
and fire performance. Glass fibre and mineral wool blankets are
materials after the building’s operational life
flexible, which ensures that gaps between the insulation are
does not present the potential ecological impact
eliminated during installation, preventing thermal bridging.
presented by foam-cored composite panels.
T h e o u t e r w e at h e r s h e e t
The outer profiled metal sheet of a double-skin builtup cladding system is known as the weather sheet. While
protecting the building by forming a weather-tight envelope,
it also acts as a structural element, as it plays an important
role in transferring externally applied loads, for example from
wind, hail, snow and foot traffic, through to the secondary
steelwork and the primary load-bearing frame.
Insulation blanket on top of the liner sheet.
Built-up steel systems offer savings of approximately
10% over rigid insulation board applications of equal R-values.
Built-up steel systems offer
savings of approximately
10% over rigid insulation
board applications of equal
R-values. They also offer
savings by fast-tracking the
critical path of the project.
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They also offer savings by fast-tracking the critical path of
the project.
Safintra supports its Built Up System with Performance
Warranties. Technical advice is gladly offered at all stages
of the project.
Safintra South Africa
Tel: 011 323 6300
Website: www.safintra.co.za and www.safintra.com
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technic al s olut i ons & p r oj e ct s
An architectural solution that
highlights the positive aspects
of an urban wasteland, Heidi
van Eeden’s design of a textile
mill at the Daspoort Wastewater
and Sewage Treatment Works
proposes to create a resourceful
environment, where wastewater
is used to produce textiles and
algae-based dye.
A model of Heidi van Eeden’s proposed textile mill at the Daspoort Wastewater and Sewage Treatment Works.
Architecture
as a living machine
an Eeden investigated the potential of industry
While changing perceptions about these locations and
as urban catalyst with which to regenerate urban
structures, Van Eeden proposes a very realistic infrastructure that
environments and reintegrate fragmented socio-eco-
would transform urban wastelands into functional and
logical systems in her thesis that won her Corobrik’s
purposeful spaces.
Architectural Student of the Year Award in 2014, serving as an
example of a forward-thinking future architect.
Her architectural solution not only functions efficiently
like a machine, but also promotes the well-being of people in
the community as well as preserving the surrounding nature
U s i n g wa s t e a s r e s o u r c e
She aimed to redefine the modern concept of waste, find
alternatives for processes in a part of the capital which is
considered an urban wasteland and mitigate pollution created
by today’s industrialisation by focusing on the restructuring
of the textile trade. She designed the site to form part of a
new kind of industrial ecology where wastewater and other
untapped on site resources are used to produce fabrics
and colourings.
By integrating local communities and natural ecosystems
with this industrial space, this 21st century textile mill is
designed as a holistic environment which blurs distinctions
between social, productive and natural space, and proves that
there is productive value in resources discarded as waste.
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in an aesthetically appealing development.
A well thought-out solution
By proposing that the current structures should be restored
and rejuvenated instead of completely rebuilt, Van Eeden
creates the chance for resources to be conserved as
well as for the history of the site to be integrated with modern
lifestyles.
It thereby reconnects the community with its past and
gives them an expectation of a future with opportunity.
Being a buildable design that will uplift the community
and acknowledge an inherent industry, Van Eeden’s textile
mill will be an asset to the City of Tshwane, should it ever
be constructed.
t h e s u s ta i n a b i l i t y c h a l l e n g e
Corobrik
The textile mill project offers a sustainable solution
Tel: 031 560 3111
to a complex challenge posed by waste sites in cities.
Website: www.corobrik.com
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INDUSTRY UPDATE
Building the future
on 350 years
Saint-Gobain, a world leader in the habitat and construction
market, this year celebrates 350 years of providing innovative
solutions in 64 countries across the globe, including
South Africa.
The celebratory 350 campaign initiatives to be rolled
out in South Africa are in line with the objectives of the
international Saint-Gobain Initiatives Foundation, to use the
The 350 years celebratory signage on the exterior of the Saint-Gobain
company’s expertise to assist disadvantaged communities
South Africa headquarters in Samrand, Gauteng.
and make a difference to people and their habitats.
Two key projects include the Adopt-a-School project to
improve educational habitats and the Architecture for Social
Gain Awards to recognise and reward local talent in the design
of educational spaces.
Adopt-a-School project
Saint-Gobain has partnered with the Adopt-a-School
Foundation, a project of the Shanduka Foundation, a non-profit
organisation that supports the creation and enhancement
of a conducive learning and teaching environment in
disadvantaged schools.
After an in-depth needs analysis was conducted at a
number of schools across South Africa, three schools have
been identified for assistance. Saint-Gobain will provide
a kitchen, a classroom and ablution facilities in schools
situated in the Western Cape, KwaZulu-Natal and Gauteng.
These projects are due to commence in May and will be
completed to coincide with the group’s global anniversary
month in October.
Saint-Gobain employees will be actively involved in the
projects, and will assist learners with supplies and immediate
schooling needs.
Architecture for Social Gain
Awa r d s This campaign has been conceptualised by
Saint-Gobain in close association with the South African
Institute of Architects, to recognise talent in the design of
spaces that allow learning and development.
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The three categories for entry include “Future” (concepts
and proposals), “Built” (existing projects) and the Adopt-aSchool proposal for structures to be built to brief. Certificates
will be awarded to professional and student category winners
with the top entry in each category winning a trip to Paris
in October to take part in the global Saint-Gobain 350
anniversary celebrations.
Entries open on 1 April 2015. Go to www.social-gain.
co.za for full details.
A 3 5 0 - y e a r h i s to r y
Since its creation in 1665 in Paris, Saint-Gobain has adapted
to the changes of the world and overcome many challenges
it faced. Backed by its experience and corporate culture, the
company has its sights set on tomorrow and knows that there
are many “reasons to believe”.
“This anniversary is an opportunity and an occasion
to remind everyone of the strength that is acquired through
350 years of history and ongoing innovations. Our experience
means we understand and focus on the long term. So, it is
with our sights set on the future and innovation that we are
celebrating this anniversary. It is our optimism that we want
to share with you in 2015,” says Pierre-Andre de Chalendar,
chairman and chief executive officer of Saint-Gobain.
Saint-Gobain
Tel: 012 657 2800
Website: www.saint-gobain.co.za
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INDUSTRY UPDATE
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r oa d s h o w d e l i g h t s a r c h i t e c t s
This year’s Architect Roadshow in the Pretoria environs (the
other two will be held in JHB and CT respectively) saw an
“Artisan Lolly” mini-bus visit eight architectural firms as well
as the PIA. Each employee was greeted with a decadent
array of ice-cream lolly options, which could be dipped into
chocolate or caramel sauce and covered in almond flakes or
crushed peanuts.
In its third year, the roadshow once again illustrated to
the architects that Media in Africa cares about them, their
work, their practices and their wellbeing.
ARC Architects having fun!
Big smiles at Boogertman + Partners.
“We followed on the very successful events we had
the past two years and really out
The idea behind this roadshow is for brands to treat
did ourselves, combining a very
architects to a fun-filled morning and design inspiration.
cool
informal
“Architectural professionals these days are under tremendous
information sharing,” says Marlene
time pressures and stress to perform,” Marlene highlights.
van Rooyen, editor of Walls & Roofs
“This is why we wanted to bring some fun and joy to their day
Magazine. “Our sponsors also had
and we achieved just that.”
experience
with
the opportunity to put their brand
Media in Africa would like to thank our sponsors, without
and marketing collateral in front
whom this day would not be possible: Rigifoam, Safintra,
of the architect and be part of
FloorworX, Isoboard, Granric Insulation, Van Dyck, Marley
bringing them a fun experience.”
Building Systems, Dezzo Roofing and Dekton.
IBSM architects welcomed the ice lolly break.
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INDUSTRY UPDATE
New store openings
benefit local communities
opening, R5 000 went towards purchasing more seeds as
well as any additional products they might need to sustain
the tunnel.
With the opening of Builders Superstore Commercia,
Mayibuye Primary School received a donation of 120 desks
and chairs for the Grade R learners who previously had to sit
on the floor.
Protea Glen Secondary School in Protea Glen and Ilinge
Secondary School in Vosloorus each received a donation of
R50 000 as part of the SuperStore openings that took place
in November 2014. The donations were used to renovate and
Builders Rivonia donated R5 000 to Sefikeng Primary School.
install much-needed structures for the schools.
With the opening of Builders SuperStore Cosmo City,
another R50 000 was donated to Cosmo City West Primary
or each of its 14 new stores that opened last year, Builders assisted a school or charity in the surrounding communities with renovation or repair needs, investing almost R200 000 in store opening initiatives.
School to be used as part of their kitchen renovation.
As a “no-fee” school, the challenge is to provide learners
from Grade R up to Grade 7 with a nutritious meal in a kitchen
that is hygienic and fully functional.
Sefikeng Primary School, a “no-fee” primary school at
Leeukop Prison, previously received a veggie tunnel from
Builders in 2012 and has been supplementing the starch
Builders Warehouse
provided by the Department of Education with vegetables
Tel: 086 000 8913
grown from the tunnel. As part of the Builders Rivonia store
Website: www.builders.co.za
The donations
were used
to renovate
and install
much-needed
structures for
the schools.
Before and after photos of the change room renovation at Protea Glen Secondary School.
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INDUSTRY UPDATE
Architectural specifier joins
tile producer
Warrick Taag has been appointed as architectural specifier
keeping
at local tile manufacturer, Johnson Tiles, to help architects,
Tiles brand top of mind
designers and specifiers choose the most appropriate type of
in the architect and
tiles and tile designs to be used for various projects.
design industry,” Taag
Taag started his career at Tile Africa as a sales consultant
the
Johnson
comments.
and has also worked at Trinergy Brand Connectors and Ogilvy
This appointment
South Africa. He holds a B.Com. marketing degree from Nelson
comes at a time when
Mandela Metropolitan University, a post-graduate diploma
Johnson
in brand management and strategic planning from the AAA
invested in its second
School of Advertising and a general management leadership
inkjet machine in order
certificate from the University of Stellenbosch Business
to stay competitive and
School.
continue to introduce
He believes that his sound business sense, his
entrepreneurial spirit, as well as patience and tenacity, will
assist him in overcoming the challenges that may come with
his job. “I anticipate that some of the obstacles will include
Tiles
has
quality, on-trend and
locally
manufactured
products to the South
African market.
Warrick Taag, new architectural specifier at Johnson Tiles.
The Portico range, Johnson Tiles’ new
collection of glazed porcelain tiles.
“I am honoured to work for a company like Johnson
Tiles, which has a heritage of over 60 years in South Africa.
The company’s future opportunities for growth will possibly
be in the production of larger format tiles and rectification,”
says Taag.
Johnson Tiles
Tel: 011 206 9700
Website: www.johnsontiles.co.za
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