Thickness 2 5 floors and floor finishes asphalt mastic per 1 in.
Roof insulation weight psf.
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.
When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.
Thickness 12 0 ceramic or quarry tile in.
Thickness 1 8 0 4 gypsum sheathing per 1 in.
Thickness 3 4 10 0 concrete fill 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.
Thickness 12 0 gypsum fill per 1 in.
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.