Hello!
Is my builder thinking correctly regarding the roof construction?
Roofing felt
Underlayment felt
Tongue and groove boards 20-23mm
Sheet metal (left over from the old roof and will probably be built-in, a few rust holes but mostly good)
TRP 70mm
Spray insulation
This means there will be an air gap above the TRP, but is that enough?
I'm mostly thinking that almost half of it is directly against the sheet metal.
If I also remove the sheet metal, it will be directly against the tongue and groove boards.
Shouldn't there be something under the tongue and groove boards, or does the solution seem good?
