weight for glass
Glass weighs 162 pounds per cubic foot. 1 thick glass weighs 1/12 of that or 13.5 lb/ft2 1/4 thick glass = .25 x 13.5 = 3.375 lb/ft2 3/8 thick glass = .375 x 13.5 = 5.063 lb/ft2 1/2 thick glass = .5 x 13.5 = 6.75 lb/ft2.