The Type IV Glass Ply Felt is manufactured with a heavyweight fiberglass mat containing heat-cured resinous binders for added dimensional stability. The high strength glass mat is saturated with type IV asphalt, giving our type IV felt excellent breaking strength, as well as a uniform porosity for ease in applications. It may be used as an inner ply or base ply in a Carlisle multi-ply system. It may be used as a base ply when mopped in place over asphalt-compatible substrates. When installed in a two ply format Carlisle's Type IV Glass Ply Felt may be used as a temporary roof.