CAP SHEET

The Cap Sheet is the layer that goes on top of the base sheet and it covers and protects the layers below it, helping to extend the life of the roof and avoiding leaks. A cap sheet is created from several layers of materials including asphalt or tar-coated layers of fiberglass. It is a fairly heavy type of roofing material, and is often referred to as “90lb roofing” due to the approximate weight of a standard square.