Flintlastic FR Cap 30 is a fire rated, glass mat cap membrane used in two-ply or multi-layer modified bitumen fire rated roofing systems. It is designed for use as a cap membrane over inorganic and organic built-up roofing systems. It also may be used as a heavy duty, venting type base sheet when installed mineral side down and either mechanically fastened or spot mopped over lightweight insulating concrete decks or existing smooth surfaced membranes. Flintlastic FR Cap 30 is reinforced with a tough fibrous glass fabric. Flintlastic FR Cap 30 is suitable for both new construction and reroofing membranes over a variety of substrates. It is surfaced with ceramic granules to provide a durable, heat reflective weathering surface.