Roof Gravel Weight

To protect the underlying layer of roofing materials as is the case with built up roofs burs.

Roof gravel weight.

Gravel to protect built up. The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m2. Contractors and builders use gravel on flat roofing for two primary reasons. There are different types and weights of gravel used on flat roofs for these purposes.

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. Generally the weight for a gravel coated roof must be within 10 25 pounds per square foot. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. Felt tar and gravel roofing 4 ply 5 3 lb m ft 2 25 9 kg m 2 felt tar and gravel roofing 5 ply 6 1 lb m ft 2 29 8 kg m 2 felt tar and slag roofing 3 ply 4 5 lb m ft 2 22 kg m 2.

The single ply membrane and other roof components including thermal insulation are loose laid. Finding a leak in a sea of gravel can be very difficult even more difficult if the gravel has been set in a layer of hot asphalt. The gravel ballast secures the roof waterproofing against wind uplift forces. Gravel is used on flat roofs for two reasons.