meso
2nd February 2011, 02:33 AM
Hi everyone
I am looking to get some advise on my designs for my gable roof and to know if it will be strong enough or not. The shed is 6m x 4.5m with 28 courses on the outside wall and 29 courses on the inside with a cavity of 10mm (see attached pics). I had a brickie mate of mine help put that up between the xmas and new year break and the I had another mate help do the slab last year in May.
I was originally going to build the roof with no ceiling and having the centre supports higher than the roof for a bit extra clearance but now I have decided to go with ceiling. This way I can build storage space in the cavity of the roof (like an attic to store camping gear, xmas lights and stuff).
My plan is to build trusses on the ground first with a gap for the ridge beam then put it all together on the top plate. The trussess will be built out of 120mm x 35mm H2 treated pine for the rafters and the joist and 90mm x 35mm for the internal supports and will be joined together by nailplates (see attached designs). I want to try and maximise the cavity space in the roof but not compromise on strenth.
So first question which one of the three designs (900mm, 700mm or 500mm from the rafter & joist join) would be strong enough?
The next question is how many trusses do I need? Over 6m I can put in 11 trusses which will have spacings of 600mm or I could put in 13 which will have spacings of 500mm between each truss?
Cheers
Mitch
I am looking to get some advise on my designs for my gable roof and to know if it will be strong enough or not. The shed is 6m x 4.5m with 28 courses on the outside wall and 29 courses on the inside with a cavity of 10mm (see attached pics). I had a brickie mate of mine help put that up between the xmas and new year break and the I had another mate help do the slab last year in May.
I was originally going to build the roof with no ceiling and having the centre supports higher than the roof for a bit extra clearance but now I have decided to go with ceiling. This way I can build storage space in the cavity of the roof (like an attic to store camping gear, xmas lights and stuff).
My plan is to build trusses on the ground first with a gap for the ridge beam then put it all together on the top plate. The trussess will be built out of 120mm x 35mm H2 treated pine for the rafters and the joist and 90mm x 35mm for the internal supports and will be joined together by nailplates (see attached designs). I want to try and maximise the cavity space in the roof but not compromise on strenth.
So first question which one of the three designs (900mm, 700mm or 500mm from the rafter & joist join) would be strong enough?
The next question is how many trusses do I need? Over 6m I can put in 11 trusses which will have spacings of 600mm or I could put in 13 which will have spacings of 500mm between each truss?
Cheers
Mitch