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