BASEGARD SA Base Sheet consists of a Styrene-Butadiene-Styrene (SBS) rubber modified, self-adhesive asphalt blend reinforced with a 1.8 lb/100 ft² (90 g/m²) glass fiber mat and coated with a fine mineral release agent on the top surface and an opaque release film on the bottom surface. BASEGARD SA Base Sheet can be used as a base layer or as an effective vapor retarder. When used as a vapor retarder, ISO 95+™ GL / ISOGARD™ GL, RESISTA™ / ISOGARD CG or ISOGARD HD Cover Board may be adhered to the top of BASEGARD SA Base Sheet with I.S.O. Twin Pack™ Insulation Adhesive, I.S.O. Spray™ R Insulation Adhesive, I.S.O.Stick™ Insulation Adhesive, Twin Jet, or hot asphalt.