COLPHENE® BSW H is a SBS-modified bitumen waterproofing membrane for use in approved blind side/under slab waterproofing assemblies. COLPHENE BSW H is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with a tough, dimensionally stable non-woven polyester mat. COLPHENE BSW H is designed for horizontal blind side/under slab waterproofing applications. The topside is surfaced with fine mineral aggregate and the underside is surfaced with polyolefin burn-off film.