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y and Leadership
Lyrebird Enterprises
Ph: (03) 9707 4300 ● Fax: (03) 9707 4277 ● 98 Enterprise Ave, Berwick, Vic. 3806
How To Build A Bullnose Verandah
Using Lyrebird Rafters
Ogee
Half-Bullnose
Bullnose
Lyrebird Rafters are:
•
•
•
•
Concave
Made from MGP12 Radiata pine
Finger jointed for superior strength
Designed for fast fixing to fascia beam
Designed and tested to exceed requirements for SAA Codes:
• AS 1170 Part 1: SAA Loading Code
• AS 1720: Timber Structures Code
• AS 4055: 1992 Wind Load For Housing
Convex
IMPORTANT INFORMATION
1. Lyrebird Rafters have been tested for strength. The instructions contained in this brochure apply to
Lyrebird rafters only and are not suitable for other rafters.
2. These instructions are based on the following assumptions:
• You have building skills
• The verandah floor or its foundations are in place
• You have a set of completed plans and/or drawings with specified verandah dimensions and a rafter
plan. (We can asssit you in setting up a rafter plan if you don’t already have one)
3. Although the diagrams following show Bullnose rafters, the same principles of construction apply to
Concave, Convex and Half-bullnose roofs.
THE CONTENTS OF THIS BROCHURE IS THE SUBJECT OF COPYRIGHT, THE RIGHTS OF WHICH ARE
OWNED BY LYREBIRD PRODUCTS PTY LTD TRADING AS LYREBIRD ENTERPRISES 2006
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How To Build A Bullnose Verandah Using Lyrebird Rafters
Stage 1
Rafter Plans
It is recommended that all timber
components be at least primed before
fixing
SUGGESTED CONSTRUCTION DETAIL FOR A BULLNOSE TYPE ROOF FOR 1800 WIDTH
VERANDAH, USING LYREBIRD RAFTERS
See SECTION A-A below
1. Fix the wall plates
Leave enough clearance under the
eaves to allow for the corrugated
iron - 16mm - and any flashing
Common rafter
fixed to wall
Battens or purlins @
900 centers
90x45 MGP12
common rafters
2. Mount the stirrups or post
bases
Hip / corner rafter
1200mm centers if using battens over rafters
3. Cut the posts
Or erect “jack posts” if waiting for the
posts to be supplied. See detail “C”
and “D”. Note minimum clearance
to the floor, including allowance for
stirrup height
1800mm
1800mm centers if using purlins between rafters
4. Erect the posts and fascia
beam
OPTION 1: Corrugated iron roof curved to 400 radius, on 90x45 F5 seasoned
pine purlins between rafters
5 degree
roof pitch
See detail “C” and “D” to cut and drill
fascia. Fix fascia support bracket or
half post to the corner of the house,
as in detail “B”
Lyrebird common rafters
spaced @ 1800 centers
5. Cut the rafters to length
400 radius
See detail “E” how to measure the
actual length of the rafters in a
straight line
6. Fix the rafters
OPTION 2: Corrugated iron roof curved to 450 radius, on 50x75 F7 oregon
battens over rafters
According to the rafter plan
7. Fix the purlins or the battens
Height
depending
on radius
See options 1 and 2 above
Lyrebird common rafters
spaced @ 1200 centers
190mm
400 radius
100x50 F7 oregon wall plate
secured to wall face
200x50 F7
oregon fascia
1
6
5
7
Min 2050mm
4
A
Ex 100x100 turned or square
post on galvanised steel post
support
3
Brick or concrete pavers or
concrete slab
2
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How To Build A Bullnose Verandah Using Lyrebird Rafters
Stage 1 - Details
SUGGESTED RAFTER PLAN FOR 1500 WIDE BAY WINDOW VERANDAH
WITH BULLNOSE ROOF, USING LYREBIRD RAFTERS
45° Valley rafters (2)
to form 100mm valley
1500mm
C Fixing to the post
22 1/2” bay window rafters (4)
Gutter clip
B
Min 2050mm clearance
to the floor of the verandah
C
A
1500mm
Common rafter
1500mm
Alternate detail
of wall plate
Post support
B How to build a hip end
Joist hanger
Join fascia
at the post
Plan view
Common rafter fixed to
the wall
Fixing to post
Fascia
support
bracket
Fixing to rafter
D Hip corner detail
90 x 45mm
or
140 x 45mm
Hip rafter
Fixing to rafter
50 x 70mm battens (3)
E Rafter length
Cut
gth
r len
rafte
Fixing to post
How to create a bullnose
valley in an internal corner
Placing purlins
between the
rafters
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How To Build A Bullnose Verandah Using Lyrebird Rafters
Stage 2
Iron
Gutter detail:
When using battens
over rafters
1. Mount the gutter clips
2. Trim the roof iron
Rafter
Roofing
screw
Important: The front of the bullnose
curve has a 80mm straight section.
You may need to trim this end
so that the iron will be clear of
Gutter
& Clip
the gutter bottom. Trim and test
one sheet first. Then, with pliers,
multigrips, or a shifting spanner
closed down to 2mm, grip valley
20mm in from the top end of the
sheet and turn up as far as possible.
3. Mount guttering and fit
downpipe pops
Gutter detail:
When using purlins
between rafters
Iron
Rafter
Roofing
screw
Trim the roof iron
Gutter
& Clip
4. If applicable, lay the valley
gutter
Lay the valley gutter between the
two rafters, as shown in detail on
previous page.
5. Lay the roof iron
•
A carpenter’s level should be
used to lay the first sheet
•
Always measure every 3rd or
4th sheet to check square
•
Saw toothing occurs when
curved steel sheets are laid (or
stepped) over each other, as
shown in the diagram. This is a
natural occurrence and cannot
be avoided. It is therefore
essential to ensure that each
succeeding sheet is pulled
square to the wall (use a string
with a hook on one end to pull
the sheet into place whilst fixing
it).
6. Finish the job professionally!
Stringline
Level
Sawtoothing
Barge cap
Side wall flashing
Use fibreglass Bullnose Hip Covers,
made to fit the roof neatly. Curved
metal valleys can be made to suit
your bullnose radius. Cap off roof
ends with curved Barge Capping.
Install curved flashing where the roof
meets the wall.
Fibreglass hip cover
To order your bullnose verandah, please contact Lyrebird on
Phone: (03) 9707 4300 or Email: [email protected]
www. l yrebi rd. com . au
Curved metal valley