CertainTeed’s Flintlastic Cap 30 Sheet is a glass mat cap sheet used in two-ply or multi-layer modified bitumen fire rated roofing systems. It is designed for use as a cap sheet over inorganic and organic built-up roofing systems. It may also 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 Cap 30 Sheet 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 when used as a cap sheet. Flintlastic Cap 30 Sheet is reinforced with a tough fibrous glass fabric.