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