Hi guys im after some advice regards a small extension flat roof build I am currently diying.
The extension is a 2.5m x 2.6/3.7 addition to an existing flat roof extension wnich will give us a much larger single storey extension to rear of house.
Its an odd shape due to an underground lpublic sewer and the outer wall reflects the angle and cleareance tolerances required by water board without a build over.
So basically one flank is around 2.5m long while the other is around 3.7m long. The proposed mid span bearer from house to rear of extension would be 3.3m in length.
It was originally intended to change existing roof set up from170x50 joists span across flanks and roof falls to its short flank, to turn the fall around 90 degree so it would fall to the rear and build new addition extension roof to the same with new 150×47 joists.
Another idea came up to keep existing 170x50 joist work in place and add new extension roof to continue as the same set up. Obviously to do this there would need to be a mid span bearing for each flanks joists.
My question is could this mid span bearer be made up of the same size timbers as the joists ie 170x50 x3 bolted together and the flanking joists connected to this bearer via timber to timber hangers?
To me this would save a lot of work than changing around the existing set up. Ive been trying to find info on how to size up this mid span bearer to effectivley support roof but have so far not found much info.
The roof construct will be 130mm 7nsulation board topped with 18mm osb3 tongue+groove with a grp waterproof membrane.
Any advise that could get the roof going would be well appreciated.
cheers.
The extension is a 2.5m x 2.6/3.7 addition to an existing flat roof extension wnich will give us a much larger single storey extension to rear of house.
Its an odd shape due to an underground lpublic sewer and the outer wall reflects the angle and cleareance tolerances required by water board without a build over.
So basically one flank is around 2.5m long while the other is around 3.7m long. The proposed mid span bearer from house to rear of extension would be 3.3m in length.
It was originally intended to change existing roof set up from170x50 joists span across flanks and roof falls to its short flank, to turn the fall around 90 degree so it would fall to the rear and build new addition extension roof to the same with new 150×47 joists.
Another idea came up to keep existing 170x50 joist work in place and add new extension roof to continue as the same set up. Obviously to do this there would need to be a mid span bearing for each flanks joists.
My question is could this mid span bearer be made up of the same size timbers as the joists ie 170x50 x3 bolted together and the flanking joists connected to this bearer via timber to timber hangers?
To me this would save a lot of work than changing around the existing set up. Ive been trying to find info on how to size up this mid span bearer to effectivley support roof but have so far not found much info.
The roof construct will be 130mm 7nsulation board topped with 18mm osb3 tongue+groove with a grp waterproof membrane.
Any advise that could get the roof going would be well appreciated.
cheers.