Imperflex MSA is a mineral surfaced, SBS polymer modified bitumen cap sheet. It is intended for use on residential roofs where roof slopes prevent effective use of shingles, tile and/or metal. It is composed of select SBS polymers blended with distilled asphalt, and reinforced with high-strength fiberglass mat. A split, silicon-coated release film must be removed before installation. This film prevents the roll from sticking during storage and aids installation.

The membrane is coated on top with factory installed, colored ceramic coated roof granules. The film must be removed for proper installation. The membrane is durable, resists coating slide at normal roof temps and is self-sealing.