LASTOBOND Shield HT (high temperature) is a SBS-modified bitumen underlayment for use in approved steep slope assemblies, and is designed to withstand service temperatures up to 240°F (116°C). LASTOBOND Shield HT is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with high tack self-adhesive. The topside is surfaced with a high strength tri-laminate polyethylene film and the underside is surfaced with protective polyolefin release film that is removed during application.
Prior to installation, unroll LASTOBOND Shield HT onto the roof surface and allow to relax. LASTOBOND Shield HT may be applied to plywood, OSB board, wood plank, concrete or masonry. Place LASTOBOND Shield HT in desired position. Remove the protective release film from the underside of the sheet and roll LASTOBOND Shield HT into place with a hand roller. Refer to the SOPREMA SBS Roofing Manual for additional application guidelines.