Collar Tie Length
(L < 3000)
Fix Bracket To Rafter
Using Four 12 x x20
Hex Head Screws
Fix Collar Tie Using Two
12 x x20 Hex Head Screws
Each Side
Locate The Break On
The Top Groove Of
Valley Beam
Fix Beam Capping To
Channel Using 3mm
Rivets Each Side At
500mm Centre
Fix Beam Channel
To Top Of The Valley
Beam Using 12 x 20
Hex Head Self Drilling
Screws At 500mm
Centres
Beam Channel
Beam Capping
Valley Beam
3.1 Collar Ties
If collar ties are required on intermediate frames they are to be
mitred to suit the pitch of the gable rafters. For gable openings up
to 6000mm collar ties are to be located mid-height of the gable
frame. For gable openings greater than 6000mm collar ties are to be
located at a height to give a collar tie length of 3000mm.
Collar tie brackets are to be fixed to gable rafters with four 12x20
hex head self drilling screws at the appropriate height. Collar ties
are then fixed inside the brackets using two 12x20 hex head self
drilling screws either side (Figure 13).
Figure 14
Measure the distance between rafter ends, (O), to check valley beam
spacing (Figure 12).
Before erecting the valley beams fix capping to the top of the beams.
First fix beam channel to the top of the valley beam using 12x20
hex head self drilling screws at maximum 500mm centres as shown
in (Figure 14). Fix the beam capping to the channel using 3mm
rivets each side at maximum 500mm centres, ensuring the break is
located in the top groove (Figure 14).
If attaching the valley beam to a header beam, notch the capping so
that it sits on top of the beam as shown in (Figure 21).
Pilot holes indicate screw locations as shown in (Figure 11). Make
sure that the two ends are flush at the connection, leaving no gaps.
4.0 VALLEY BEAm ASSEmBLY
4.1 Side Attached
For side attached units fix the rafter to valley brackets to the beam
capping (150 attachment beam will be considered a valley beam)
at the correct rafter positions (refer Section 5) using six 12x20mm
hex head screws per bracket through the pre-drilled holes (Figure
15). Please note that the bottom face of the bracket is in line with
the bottom edge of the upper groove in the beam. Check positions
before drilling.
If any intermediate columns are required measure the valley beam
marking where they meet. Fasten post brackets as explained in
‘Outback Flat Attached Verandahs, Patios & Carports’ under “Bracket
and Filler Connections”. Support the second valley beam at the
spacing determined in Section 3.0 on adjustable construction props.
4.2 End Attached
For units attached on the end to a wall, wall brackets are positioned
at either side of the gable opening at the spacing determined in
section 3.0. The first bracket is fastened to the wall with two M8
masonry anchors. The curved legs of the bracket are located at the
top (Figure 16).
Do not anchor to mortar joints. Locate the first valley beam (beam
cap on top) up into the wall bracket so the curved legs locate against
the top flute of the beam.
Figure 11
Figure 12
Figure 13
Gable Opening (O)