Sopraply Stick is an SBS-modified bitumen, self-adhered base ply for use in multi-ply membrane and flashing assemblies. Sopraply Stick is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with a high tack self-adhesive layer and is reinforced with tough, dimensionally stable non-woven polyester mat. The underside is surfaced with protective polyolefin release film that is removed during application.