The purpose of gravel on a flat roof.
Purpose of gravel on roof.
Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system.
Flat or almost flat roofs can collect a tremendous amount of water especially if their outlets or downspouts become plugged with leaves and debris.
Have you ever wondered why contractors install gravel on flat roofs.
A flat or low slope roof is often not a suitable surface for shingles or other roofing materials because moisture can t flow off them.
A tar and gravel roof is very heavy.
The purpose of stone or gravel ballast on a flat roof published by justin on september 19 2019 september 19 2019 it is not unusual to find a gravel top coat on commercial roofing systems.
Gravel is used on flat roofs for two reasons.
Also a tar and gravel roof is very rugged and safe to walk on.
One solution to this is a built up or tar and gravel roof where many layers of hot asphalt or bitumen tar paper and a waterproof membrane are applied and then covered with gravel.
On many flat roof low slope commercial buildings it s common to see gravel on top of the roof.