- granab ab

GRANAB
SUBFLOOR SYSTEMS
INSTALLATION INSTRUCTIONS
Granab Subfloor Systems 3000 and 7000
have been tested and certified by the SP
Technical Research Institute of Sweden.
Welcome to Granab AB
GRANAB manufactures subfloor systems for homes, offices,
schools and public buildings. The systems feature steel floor
girders with dampening elements for effective impact and
airborne sound insulation.
Granab subfloor systems are patented and type-approved
with respect to sound-dampening properties, dynamic loads
and strength. About 4 million m2 have been installed in various projects.
Granab's main office is in Vårgårda, Sweden with production facilities in
both Vårgårda and Lindköping.
Bygg- och Miljöteknik Granab AB
Phone: +46 (0) 322-66 76 50
Fax: +46 (0) 322-66 76 55
E-mail: [email protected] www.granab.se
Mailing address: P.O.Box 172 SE-447 24 Vårgårda Sweden
Street address: Verkstadsgatan 4 Vårgårda, Sweden
2
CONTENTS:
Granab Subfloor System 3000
4
Design
Granab Subfloor System 7000
5
Design
Planning instructions
6
For various load conditions
Alternative floor coverings
7
Chipboard & carpet, chipboard & parquet,
floating parquet
Planning
8-9
Drawings, delivery optimisation and installation
drawings
This is what you need
10 - 11
Installation tools, girder spacers, height adjustment,
trimming girders, ergonomic tools
Installation, step by step
12 - 20
Support blocks and dampening elements
12
Laying out girders
13
Height adjustment, frame girders
13
Attachment of frame girders
14
Height adjustment and attachment of other girders14
Trimming and adjustment of adjustment screws
15
Recessing adjustment screws
15
Adjustment of adjustment screws
16
Recessing adjustment screws
17
Door openings, thresholds, cover mouldings
18
Installation for high levels, 250 – 420 mm
19
Installation of masonite beams, 420 – 1000 mm 19
Installation of skirting
19
Installation of plastic film on Granab girders
in moist environments
20
Ventilated subfloors
20
Moisture, mould, radon
Tiled surfaces, bathrooms
Checklist 1 – 2
21
22 – 23
Installer's inspection of Granab Subfloor Systems
3000/7000
3
Granab Subfloor System 3000
for adjustable heights 30-180 mm, excl. floor covering
26,5
17
45
17
79
MIn. height
30 mm
Max. height
180 mm
Section with support block
and dampening element, level
adjustment screw and concrete anchor
Construction heights: Flexible
construction heights from 30 to
180 mm, excl. floor covering
With supplementary sheet between the girders
22-mm parquet, alternatively 22-mm chipboard & 15-mm parquet or carpet
20
600
600
General installation drawing, Subfloor System 3000 – Residential
400
600
600
600
600
600
600
400
NB: The c/c distance between girders is determined by the choice of floor covering. For other premises, see the c/c distance between floor
girders on page 6.
4
Granab Subfloor System 7000
for adjustable heights 70-420 mm, excl. floor covering
Special heights up to 1000 mm (see page 19)
40
Adjustment
heights
70-420 mm
45
Construction heights:Flexible construction heights from 70 to 420 mm, excl. floor covering
Special heights up to 1000 mm with masonite beams on girders (see page 19)
Section with support block
and dampening element, level
adjustment screw and concrete anchor
22-mm parquet, alternatively 22-mm chipboard & 15-mm parquet or carpet
20
600
600
General installation drawing, Subfloor System 7000 – Residential
400
600
600
600
600
600
600
400
20
NB: The c/c distance between girders is determined by the choice of floor covering. For other premises, see the c/c distance between floor
girders on page 6.
5
Planning instructions for various load conditions,
Granab Subfloor Systems 3000 and 7000
Recommended c/c distance between
floor girders (sections) and support
blocks, Systems 3000/7000:
1. Rooms in dwellings, hotels, hospital rooms and staff
rooms, c/c distance, girders (sections), 600 mm.
2. Assembly rooms such as classrooms, rooms in childcare centres, lecture halls, office rooms, premises for
restaurants, cafes and dining halls, c/c distance, girders
(sections), 400 mm.
3. Open areas in libraries, spaces with fixed seating such
as in churches, theatres and cinemas, c/c distance, girders (sections), 400 mm.
4. Spaces without fixed seating in churches, concert halls,
theatres, cinemas, museums, exhibition halls, retail areas in department stores and shops, gyms, sports centres, dancehalls, corridors in schools, etc., c/c distance
girders (sections), 300 mm.
Load capacity
For girder spacing for homes, c/c distance
600 mm = 4 tons/m2
The point load capacity and distributed load of various floor coverings
installed on Granab systems are calculated according to the specifications of the respective flooring manufacturers.
System 3000
1st – 2nd girders, 400 mm
c/c distance between floor girders (sections), 600 mm
c/c distance between
support blocks, 600 mm
Distance from
wall, approx.
40 mm
System 7000
1st – 2nd girders, 400 mm
Distance from
wall, approx.
20 mm
6
c/c distance between floor girders (sections), 600 mm
c/c distance between
support blocks, 600 mm
Examples of alternative floor coverings
Follow the instructions for installation and laying from the respective chipboard
and parquet manufacturers.
22-mm chipboard & 15-mm parquet
NB: Use flooring paper as an
interlayer between the chipboard and parquet.
22-mm chipboard & carpet
Gluing/screwing chipboard
NB: Casco Superset no. 3879 or equivalent
22-mm parquet, floating or
glued to the girders
Floating
Gluing, parquet
NB: Use intermediate strips of
flooring paper.
NB: Casco Superset no.
3879 or equivalent
WC/Bathroom
Entrance/Hall
Tiles
7
Planning, logistics efficiency
Delivery optimisation
Granab systems are packed and delivered with pre-cut and
dimension-adapted floor girders and factory-fitted support
blocks and dampening elements. Each girder is labelled with
a room name and length that matches the information on the
installation drawing for each flat or other agreed-upon space
subdivision.
Granab systems are packaged in bundles on EUR pallets with
a maximum length of either 2600 mm or 3800 mm.
BALKONG CA 6,5
m2
2600
2600
1360
670
380
760
1520
1620
820
2360
300
830
1460
1360
300
360
2600
1080
2600
1080
2210
2600
310
500
2040
500
320
2600
2600
SOVRUM
3
2210
CA 11,5
m2 2210
1080
2600
2600
SOVRUM 2
CA2600
8,5
m2
2520
2210
1080
2600
2370
500
440
1360
2600
300
2450
1570
1100
1240
1620
2600
300
500
300
2460
450
2690
1520
2600
KÖK/V-RUM
CA 30 1080
2600
m2
2600
(V-RUM
CA 20 m2) 1080
2600
2460
2600
1630
1520
2600
730
2600
950
2530
2090
300
300
250
2000
1520
1470
1500
1500
650
850
1700
990
300
2360
300
530
300
2360
SOVRUM 1
CA2360
12,5 m2
300
500
2360
2360
300
2360
1970
HALL
2000
850
300
2600
850
2820
SOVRUM
2360
1 CA
11,5 2360
m2
300
1460
300
2360
1110
2450
2360
2600
2600
2600
510
1110
300
2600
1110
2600
300
2360
2600
1110
2600
2360
850
2600
1110
300
1520
2600
2600
2450
2600
BALKONG CA 6,5
m2
1110
300
2480
2600
2600
850
2600
500
1520
2600
2600
2600
1470
300
1110
2600
HALL1510
2380
2600
1110
2600
2600
1520
2600
2600
750
850
1460
1510
2600
WC/DUSCH
CA 5,5
m2
KLK
1220
WC CA
CA
2,5
m21310 E 1,5 m2
2820
1110
2390
2600
450
2600
340
1110
580
850
1550
1550
850
300
1230
2600
2600
1520
2600
2000
2450
WC/DUSCH
CA 5,5
m2
1220
FRD
1430
2600
1460
2600
1520
2600
760
1310
8
520 30
2 m2
E CA 1520
1410
2450
WC/DUSCH
CA 5,5 m2
1370
2600
KÖK/V-RUM
CA 33
2600
m2
(V-RUM2600CA 23 m2)
2600
2380
640
2600
310
2600
500
360
2600
1320
1360
850
2430
950
1370
380
1370
2600
1070
2600
2600
1560
2600
1070
2600
2600
2430
1070
370
740
500
300
1320
1320
2600
1320
1320
950
2390
1070
2600
2600
2600
2340
850
KLK CA
23403,5
E
m2 2340
520
m2
2580
850
HALL
2600
1550
2600
2600
300
850
2600
1460
850
KLK
1530
1070
KÖK/V-RUM CA 30
1070
m2 2600
(V-RUM CA 20 m2)
1070
640
1500
300
300
2450
2600
2600
1,5
E CA 1430
2120
310
1120
HALL
WC/DUSCH
CA 5,5 m2
2360
340
960
1070
2600
2030
1370
2600
500
300
2350
2600
1620
2600
2600
1590
2460
2600
1200
500
2480
300
1460
1460
2280
2480
300
1370
2600
500
330
300
300
990
2010
2600
300
2360
2600
500
310
1370
2480
2360
2600
2290
2450
2600
2480
SOVRUM
1 2480
CA 11
m2 2480
300
2600
380
1370
300
1880
500
300
1500
1370
2600
2360
SOVRUM
2
CA 12,5
m22360
850
1740
850
570
300
2460
950
490
650
2600
300
2360
2460
2600
1320
1580
2600
530
2360
1810
1090
300
1810
2600
2250
2600
1090
1770
500
2600
2600
1320
2350
1520
1980
500
1090
2600
720
2250
2350
2600
300
2460
SOVRUM
1
CA 12,5
m2 2460
2250
1090
300
2600
2600
850
2600
1090
720
500
1600
2600
1090
330
2460
0
2600
KÖK/V-RUM
CA 33
2600
m2
2600 CA 23 m2)
(V-RUM
2250
SOVRUM 2
CA 2250
9 m2
500
2460
49
1090
2250
400
2250
2250
2260
2600
2160
BALKONG CA 6,5
m2
1090
1540
1090
2600
720
2600
2600
340
950
1080
500
300
960
2210
1930
BET
ANT
ÄNDRINGEN AVSER
SIGN
DATUM
KV.UGGLAN
VEIDEKKE SVERIGE
BALKONG CA 6,5
m2
GRANAB AB
BOX 172
447 24 VARGARDA
UPPDRAG NR
RITAD AV
HANDLÄGGARE
Claes-Goran Andreasson
DATUM
ANSVARIG
SKALA
NUMMER
071116
GRANAB S-7000
PLAN 2-5
HUS 1
GR 1:75
1:50(A1)
Packaged and labelled for each flat
8
BET
Planning, logistics efficiency
Interior walls for finished Granab subfloors
Walls for flats or other subdivisions are first erected from floor to ceiling. It is advisable to erect interior walls within a flat or subdivision on
finished Granab subflooring, including the chipboard.
Erection of interior walls in this manner permits the chipboard to be
installed quicker and entails less waste in that one is working with larger,
continuous floor surfaces. Material consumption for the interior walls is
lower and installation of both the Granab floor and interior walls goes
significantly faster.
10x21M
10x21M
2600
2600
2600
2600
SOV2
6.6
m²
1
1
2600
2600
2600
2600
2600
2600
2600
2600
1910
2600
2600
2600
2600
2600
2600
2600
1910
2600
2600
2600
2600
2600
2600
2600
2600
1910
2600
2600
2600
2600
2600
2600
1960
2600
2600
1960
2600
2600
1960
2600
1960
BOD
4.5
m²270
8x21M
2600
2600
2600
2600
1950
2600
SOV1
6.9
m²
9
2600
2600
2600
1
1950
2420
10x21M
2600
BAD/VASK/OMKL.
2600
7.5
2600
m²
0
53
32
2600
1880
2570
00
26
300
300
2600
300
300
24102520
2410
800
28x21M
6
380
2530
2460
300
2460
300
2460
300
TERRASSE
9.9
m²
300
BAD/VASK/OMKL.
7.4
2410
m²
300
10x21M
300
2410
300
2410
300
300
300
2
2600
300
600
2600
950
80
2600
SOV1
11.8
m²
2
2420
2420
2520
2510
2560
2440
410
560
660
2380
300
1400
2600
4
300
41
0
2380
2500
2520
1810
950
2600
950
2270
0
300
430
2600
1200
2600
2600
2140
1
350
2600
2600
2600
2600
2600
2600
2600
2600
2600
1
1960
1960
2600
2
1480
10x21M
2600
2410
300
2
2600
1740
2600
1740
2600
1740
2330
1
2600
2600
2600
2600
SOV2
10.4 1740
m²
2600
1740
2600
2600
1740
2600
2600
1810
1960
SOV2
6.6
1960
m²
8x21M
2460
2600
10x21M
80
20
18
TERRASSE
920
2600
2600
2120
10x21M
11
m²
2410
11
2000
1680
2410
1430
2560
2600
9
1960
5
2600
STUE/KJØKKEN
37.8
m²
1960
2600
1950
2600
2600
1950
2600
2600
2600
2600
BET
ANT
ÄNDRINGEN AVSER
SIGN
DATUM
KV.RONNVIKVEIEN
1950
2020
GVJ
9x21M
16
390
1970
9x21M
870
2600
2600
260010x21M
1480
2600
2410
300
143010x21M
1230
2600
1
2600
2600
1480
1
1430
1430
300
2
300
300
1960
1950
2600
2600
STUE/KJØKKEN
28.4 2600
m²
8x21M
2600
430
2600
1960
2600
STUE/KJØKKEN
2600
39.5
m²
300
300
2600
5
2600
2600
2600
2600
430
2600
2600
2600
2600
6
2600
8x21M
1
2600
430
2500
1
2600
340
HALL
1480
4.7
m²
2600
2600
2400
2600
2600
5
2600
2600
2600
SOV2
6.6
2600
m²
2600
2600
2600
2600
2600
1580
4
1190
9
2600
HALL
7.8
m²
2600
2400
10x21M
300
410
1410
2330
1
2140
1430
2540
10x21M
2600
1430
2600
10x21M
WC
3.9
1680
560
2470
2600
940
1
2600
2600
1680
SKAP
2.6
2600
m²
940
2600
1880
1680
10x21M
2600
GANG
13.8
m²
10x21M
2600
940
1680
2400
2400
1010
2600
1430
HALL
7.8
m²
2600
1230
80
420
1
2600
2600
8
1500
EL-SKAP
0.6
m²
10x21M
1430
2600
2
1800
1680
2400
2600
1170
2600
2180
SKAP/BOD
3.2
m²
2600
11
300
2600
m²
1430
12
2600
8
SKAP
2600
2.6
2600
2600
1100
1170
2600
20
300
300
2520
1100
2470
2600
10x21M
1320
GANG
10.3
m²
2600
10x21M
2600
300
2410
2410
1100
10x21M
1100
1720
300
2410
10x21M
1100
1910
2600
12
300
2410
2
430
1500
10x21M
300
1100
680
2
1910
1910
8x21M
2600
440
STUE/KJØKKEN
40.7
m²
2600
11
820
2600
2600
950
2310
300
10x21M
820
2600
800
10x21M
2600
4.1
m²
400
300
2410
4.1
m²
10x21M
1600
820
2600
HALL
1100
HALL
1100
820
820
2600
9
1
820
820
820
BAD/OMKL.
2600
8.6
2600m²
2330
2410
1100
2600
950
2310
300
300
300
2410
1170
2600
2
600
950
24102520
1100
2400
SKAP/BOD
3.2
m²
2600
BAD/VASK/OMKL.
2410
7.4
m²
12
2600
2
1170
690
2400
9
9
2600
2400
2600
870
2600
10x21M
2600
10x21M
300
300
2600
2460
2600
90
660
10x21M
GANG
10.3
m²
2600
2380
300
10x21M
2600
2
680
2440
520
270
6
2380
2460
SOV1
11.8
m²
560
300
300
820
820
10x21M
560
4
300
10
1720
2530
2460
2440
m²
1870
1280
300
1890
2500
WC
1870
3.9
0
380
300
TERRASSE
40
0
53
2600
2600
1870
11
800
820
2600
2600
0
1400
2600
2600
32
00
26
2600
28x21M
820
8.6
m²
2600
2600
820
2600BAD/OMKL.
2 2600
880
TRAPPEROM
21.1
m²
2600
940
1320
1870
2000
820
2600
11
1870
2600
820
1810
2600
2180
1870
2
1970
1900
1010
820
2310
1
2560
2
2600
2600
950
940
2600
2600
2600
10x21M
2600
430
2600
10x21M
2600
2600
2600
880
400
2600
1
940
2420
2600
2600
950
10x21M
1550
2600
STUE/KJØKKEN
40.7
m²
2560
2600
1910
SOV11910
6.9
m²
1
2600
2600
2600
2600
SOV3
8.4
m²
9 10
2600
1980
SOV3 1910
8.4
m²
1
1790
1910
2600
2600
8x21M
2600
2600
2600
2600
2600
SOV2
6.6
m²
1
12
2600
390
2600
2600
2260
2600
410
2600
2600
2600
2600
1
6.9
m²
2600
2600
SOV1
2560
2600
2600
300
1980
TERRASSE
11.3
m²
TERRASSE
9.5
m²
GRANAB AB
BOX 172
447 24 VARGARDA
UPPDRAG NR
RITAD AV
HANDLÄGGARE
Claes-Goran Andreasson
DATUM
ANSVARIG
SKALA
NUMMER
080214
GRANAB S-7000
PLAN 1-4
HUS C
1:50(A1)
GR 1:73
BET
Intra-transport in conjunction with framework construction
Because Granab systems consist of non-organic materials and are not affected by moisture or temperature variations, they can be delivered while the framework is still under construction. Granab girders can be produced with
a maximum length of 2600 mm – the same length as for a bundle of plasterboard. The plasterboard for the walls
can be moved in along with the wall girders, which are placed on stands above the Granab girder packages.
By lifting the materials into place during framework construction and erecting the interior walls above the Granab
system, workflow is more efficient and costs for logistics are minimised.
Girders are pre-cut to the correct lengths according to the
drawing for each room unit.
9
Installation tools, Granab Subfloor Systems 3000 and 7000
Mandrel for recessing in predrilled holes
Screwing tool for adjusting floor
girder heights
For screwdrivers
Short model: Cat. no. 8100
Long model: Cat. no. 8200
Drill bit for recessing adjustment
screws in girders
Cat. no. 8600
Mandrel for
final fixation
Mandrel for installation of concrete anchors (1 of each included)
Cat. no. 850 A Length 250 mm
Cat. no. 850 B Length 500 mm
Cat. no. 850 C Length 1000 mm
Screwing tool for manually adjusting floor
girder heights
Short model: Cat. no. 8300
Long model: Cat. no. 8400
Concrete drill bits for concrete anchors.
Cat. no. 8700, 250 mm, short
Cat. no. 8800, 460 mm, long
Installation pipe for concrete anchors
Cat. no. 8900
Accessories Girder spacers
Cat. no.
9300
9400
9500
9600
Tool
Girder spacing 300 mm
Girder spacing 400 mm
Girder spacing 500 mm
Girder spacing 600 mm
Automatic screwdriver
Chipboard flooring screws Insulation anchor, system 7000
För isoleringstjocklek A
20
Automatic screwdriver type
HILTI, 4000 rpm unit. For
chipboard flooring screws.
Contact Granab.
10
Self-tapping screws for chipboard. Contact Granab.
70
Insulation thickness, A mm: 40, 80, 120 or as agreed.
Cat. nos. 7040, 7080, 7120
Insulation bracket System 3000
Insulation bracket System 7000
System 3000 with built-in insulation bracket in the
section for 25-mm insulation
Insulation thickness, A mm: 40, 80, 120 or as agreed.
Cat. nos. 7040, 7080, 7120
Level adjustment
Trimming girders
with laser levelling
with compass saw
Ergonomics during installation
Screwing tool, long
Cat. no. 8200
Mandrel, long
Cat. no. 850C
Installation pipe for concrete anchors
Cat. no. 8900
All installation tasks can be carried out in comfortable working positions using the long screwing tool
model, long mandrel model and installation pipe for concrete anchors. (Contact Granab.)
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Installation, step by step
Granab Subfloor Systems
System 3000
System 7000
1. Support block and dampening
element
Sections with support blocks and dampening elements, level
adjustment screws and concrete anchors
Important general joints:
NB: Always ensure that the flooring manufacturer's
requirements are fulfilled regarding expansion joints, gaps
against walls, etc.
Both prior to installation and after installation, all surfaces
must be carefully cleaned.
All adjustment screws must be carefully secured in the subfloor with concrete anchors. If all adjustment screws are
not properly secured, there is risk for creaking and unevenness
in the floor covering after installation.
Adjustment screws must always be recessed into the floor
girders so that the upper edges of the adjuster screws do not
come in contact with the floor covering, which would cause
“bridging” in the sound insulation.
When installing chipboard or chipboard/parquet on the
girders, it is very important that the chipboard or parquet is
not in contact with walls. There must always be a gap of about
5 mm between the walls and chipboard/parquet so that the
floor is able to move freely. This is necessary to ensure that the
planned sound insulation is attained.
Furthermore, relative humidity in the room is very important
to take into consideration when using wood-based
flooring, both during and after laying. The manufacturer's
instructions must be carefully followed.
Carefully follow the points on the installer's
checklist on pages 22–23.
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If blocks and dampening elements are not ordered
factory-installed in the girders, these shall be fitted
in the girders according to the general drawings on
page 4, alternatively, page 5.
2. Laying out girders
3. Height adjustment,
The girders are laid out according to the general
drawing on page 4, alternatively page 5, depending
on the choice of system – 3000 or 7000 (residential).
For offices, schools and assembly rooms, see c/c distance, girders, on page 6.
When using installation instructions prepared by
Granab for specific projects, follow the specifications
for girder locations on the layout drawing.
frame girders
Height adjustment, first frame girders, using a laser.
The height is adjusted to 10 mm lower than the final
girder height. Begin with the adjustment screws
that are to be fitted at each end and at the middle
of the girder. The girders are adjusted upwards with
the screwing tool in an electric drill. See page 10.
To facilitate installation and obtain the correct c/c
spacing between the girders, use a Granab girder
spacer.
Girder spacers are available in the following lengths:
300, 400, 500 and 600 mm. See page 10.
13
4. Attachment of frame girders
Begin by attaching the frame girders. Drill through
the adjustment screw down into the base about
30 mm when using a 25-mm long concrete anchor
(also available in 40-mm lengths). NB: Begin with
three points of attachment (at the ends and middle
of each girder).
Drop the concrete anchor through the screw.
Secure the concrete anchor using an installation
mandrel, cat. no. 850. See page 10.
The frame girders are now in place, adjusted to
10 mm below the final girder height.
14
5. Other girders
Follow the same attachment and height adjustment
method for all other girders as used for the frame
girders (10 mm lower than the final height with
three points of attachment).
6. Trimming and adjustment of
7. Recessing adjustment screws
adjustment screws
Once all girders have been adjusted to 10 mm under
the final height with three points of attachment in
each girder, the girder screws must be trimmed
even with the tops of the girders. Trim the screws
using a chisel.
Once the screws at the three points of attachment
in each girder have been trimmed, all girders are
adjusted 10 mm upward to their final height.
NB: The reason for trimming the adjustment screws
and for the girders being adjusted upward 10mm
only after trimming is to prevent the upper edges of
the adjustment screws from coming in contact with
the overlying floor covering installed later. This procedure ensures that they are recessed into the sections. “Bridging” in the sound insulation would otherwise occur if the upper edges of the screws were
in contact with the floor covering.
15
8. Adjustment of adjustment screws
Approximately 10 mm
of clearance between
adjustment screw and
subfloor
10 mm
After the girders have been installed and adjusted
upwards at their three points of attachment to the
final, correct height, attachment of all other adjustment screws in the girder holes is begun; the blocks
with the dampening elements are pre-fitted.
NB: The screws are threaded down into the respective girders with the blocks so that there is about
10 mm remaining to the subfloor (see the figure at
the upper right).
The screws are thereafter trimmed and threaded
down towards the subfloor.
16
9. Recessing adjustment screws
Lastly, the screws are secured using the same method
as previously described for the concrete anchors.
After all girders are properly secured to the subfloor
and adjusted to their final height, all points of attachment must be checked to ensure that all screws are
recessed into the girders.
NB: If any screw projects above a girder (so that it can
come in contact with the subsequently laid floor covering), it must be recessed. This is done using Granab's
cutting drill bit for recessing adjustment screws, cat. no.
8600, that is included in the standard set of installation
tools (see the accessories on page 10).
Lastly, check that all screws are properly secured to the
subfloor.
10.
Alternative attachments
On some projects, concrete anchors can be
replaced with concrete screws, alternatively
concrete nails, set in place using a bolt gun.
(NB: Not recommended for prefab subfloors of
the type HDF)
Wood screws are used with wooden subfloors.
Carefully follow the points on the
checklist for the installer's inspection on pages 22–23.
17
11.
Door openings, thresholds,
cover mouldings, System 3000
A board is placed on the girder flanges as a foundation for subsequent installation of a door threshold
or cover moulding (NB: Not chipboard).
18
12.
Door openings, thresholds,
cover mouldings, System 7000
The girder is installed at the centre of the door
opening so that the board has the same height
difference as other girders. The board must be
screwed and glued to the girder in the door opening. The board is used for subsequent installation of
a threshold or cover moulding.
13.
Installation at high height
For construction heights over 250 mm, the floor covering can be attached at the room corners for lateral
stabilisation.
14.
Installation at extra high height
As standard, the level of the Granab Subfloor System 7000 can be adjusted up to 420 mm. If heights are preferred
up to approximately 1000 mm, masonite beams are fitted to the Granab girders. Masonite beams are available in
various heights and lengths.
Masonite beams are secured to Granab girders with Superset no. 3879 or equivalent and self-tapping screws.
NB: Mounting screws may not come in contact with adjustment screws/blocks.
15.
Installation of skirting
When attaching the skirting, it must be pressed hard
down against the floor covering.
19
16.
Installation of plastic film on Granab girders in moist environments
NB: The plastic film is installed above the girders – not directly on
the concrete subfloor.
Installation, floating parquet
Granab systems, including girders, are entirely non-organic and not affected by moist environments. By placing
the plastic film over the girders, effective, long-lasting moisture protection is obtained against the floor layer
above.
Installation, floating 22-mm chipboard
Granab systems, including girders, are entirely non-organic and not affected
by moist environments. By placing the plastic film over the girders, effective
moisture protection is obtained against the floor layer above.
Masonite beam installation
Plastic film used in installation
of masonite lightweight beams.
NB: The plastic film is placed under
the masonite beam.
Ventilated subfloors when moisture,
mould or radon is present
Granab subfloor systems entail:
• Free airflow between floor girders and bottom slab.
• Attachment to mechanical negative pressure ventilation equipment ensures good ventilation between
the bottom slab and floor.
• To protect the floor covering against moisture, plastic film is laid above the galvanised steel girders,
which in combination with mechanical negative
pressure ventilation ensures an environment free
from moisture.
• Granab subfloor systems are also used in radon
decontamination.
20
Order our ventilation
pamphlet for more
information.
Tiled surfaces
Granab systems are installed as subfloor systems for tiled areas in halls
and wet rooms in various construction projects.
Granab systems – which consist entirely of non-organic materials – are
not sensitive to moisture and at the same time, provide effective impact
and airborne sound insulation.
The girders are installed with c/c spacing of 300 mm.
Example, remodelling: Granab subfloor system, c/c 300 mm,
with 22-mm chipboard, sheet of non-organic material, moisture
barrier, tiles
Bathrooms
C
B
A
A: Chipboard flooring, 22 mm
B: Sheet of non-organic material
C: Floor levelling compound
General drawing for tiled area
21
C
C
B
A
CHECKLIST 1 – Installation, subfloor system
Installer's inspection of Granab Subfloor System 3000/7000
Company:
Installer:
Object:
Flat no.:
Subfloor system installation
Inspection (check off)
1. The installation surfaces for the subfloor system must be carefully
swept and vacuumed so that no organic or other residual materials
remain on the subfloor/floor surfaces.
2. All adjustment screws are threaded (recessed) into the floor girders by at least 10 mm (after any trimming) so that no adjustment
screws come in contact with the floor covering.
3. The heights of all floor girders are adjusted so that they are the
same.
4. There is clearance of at least 10 mm between the floor sections
and adjoining walls.
5. There is clearance of at least 5 mm after trimming the sections.
6. All adjustment hardware is secured to the subfloor.
7. Installations in and beneath the subfloor system have at least 5 mm
of clearance to other components of the the subfloor system.
8. Installation of the subfloor system has been conducted according
to the provided installation instructions.
Date
22
Supervising installer
CHECKLIST 2 – Installation, floor covering
Installer's inspection of Granab Subfloor System 3000/7000
Company:
Installer:
Object:
Flat no.:
Installation, floor covering
Inspection (check off)
1. Cleaning is to be carefully checked prior to installation of the floor
covering so that no organic or other residual materials remain under
the subfloor system.
2. NB: Trimming and other tasks involving the floor covering may not be
conducted so as to cause contamination (such as with sawdust) of
the cleaned floor surface.
3. There is clearance of at least 5 mm between the floor and adjoining
walls.
4. Chipboard flooring: When attaching chipboard, no glue has come in
contact with the adjustment hardware. The instructions from the
manufacturer have been observed for the used flooring sheet.
NB: Ensure that the screws used to secure the chipboard do not
extend into the underlying adjustment unit and dampening pad.
5. Parquet: Instructions from the manufacturer for the parquet used
have been followed.
Flooring paper has been used as an interlayer between the chipboard
and parquet.
6. For construction heights above 250 mm, the chipboard sheets are
attached at the room corners so as to attain lateral stability (see
point 13 on page 19).
Date
Supervising installer
23
Bygg- och Miljöteknik Granab AB
Phone: +46 (0) 322-66 76 50
Fax: +46 (0) 322-66 76 55
E-mail: [email protected] www.granab.se
Mailing address: P.O.Box 172 SE-447 24 Vårgårda Sweden
Street address: Verkstadsgatan 4 Vårgårda, Sweden