G
george765
Hi,
Not built a flat roof before, so help from experienced builders would be much appreciated.
Drawings attached show the blockwork I have ready for a flat roof to be fitted.
a structural engineer has looked and said no steel is needed and just to 'double-up' the joist going across the opening.
I plan to clad the roof with celotex EL3000 130mm then fit a rubber membrane covering.
The roof will also need an opening 1500x1000 for a velux flat roof skylight.
.
some questions...
Do the joists going from/to the left and right walls need to rest on both leafs of the concrete block cavity wall ?
Do I need a timber wall plate on top of both walls ?
what size timber should I use for the wall plates ?
what size timber should I use for the joists ?(I was thinking 170x50)
should I use straps to hold wall plate to wall then screw joist to wall plates or use straps from the joists to the walls ?(I've seen these in builders merchant). These would also then secure the wall plates to the top of the walls.
How should I finish the opening at the top ready for upvc windows/doors ?
How should I fix the double timber at the front above the opening ?
should thes two timbers be bolted together ?
any sketches would be really helpful.
.
thanks in advance for your help
George
Not built a flat roof before, so help from experienced builders would be much appreciated.
Drawings attached show the blockwork I have ready for a flat roof to be fitted.
a structural engineer has looked and said no steel is needed and just to 'double-up' the joist going across the opening.
I plan to clad the roof with celotex EL3000 130mm then fit a rubber membrane covering.
The roof will also need an opening 1500x1000 for a velux flat roof skylight.
.
some questions...
Do the joists going from/to the left and right walls need to rest on both leafs of the concrete block cavity wall ?
Do I need a timber wall plate on top of both walls ?
what size timber should I use for the wall plates ?
what size timber should I use for the joists ?(I was thinking 170x50)
should I use straps to hold wall plate to wall then screw joist to wall plates or use straps from the joists to the walls ?(I've seen these in builders merchant). These would also then secure the wall plates to the top of the walls.
How should I finish the opening at the top ready for upvc windows/doors ?
How should I fix the double timber at the front above the opening ?
should thes two timbers be bolted together ?
any sketches would be really helpful.
.
thanks in advance for your help
George
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- george765
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- george765
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