Thickness 1 8 0 4 gypsum sheathing per 1 in.
Roof insulation weight psf.
A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof.
When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.
3 ply ready roofing 1 0psf 2 15 lb 1 90lb 1 7psf 3 15 lb 1 90lb 2 2psf 3 ply gravel 5 6psf 4 ply gravel 6 0psf 5 ply gravel 6 5psf.
Thickness 3 4 10 0 concrete fill per 1 in.
Thickness 12 0 gypsum fill per 1 in.
Thickness 5 0 lumber sheathing per 1 in.
Asce states that rigid roof insulation weighs 1 5 psf per inch of thickness whereas polyiso insulation like thermax is 0 25psf per inch.
Weight psf sheathing plywood per in.