Bitec, Morrilton, Ark., offers IMPERFLEX MSA, a factory-installed mineral-surfaced self-adhered membrane; and IMPERFLEX USA, a smooth-surfaced, self-adhered membrane. Both sheets are composed of select distilled asphalt and prime grade SBS polymers, reinforced with high-strength fiberglass mat. The membranes are durable, resist slide and are self-sealing. Other applications include waterproofing on commercial roofs at copings and related construction details. IMPERFLEX MSA has many residential roof applications as well. Both products have silicone impregnated split release film.