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