LASTOBOND® ECO is an SBS-modified bitumen underlayment for use in approved composition shingle steep slope assemblies. LASTOBOND ECO is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with high tack self-adhesive and is reinforced with a high quality random glass fiber mat. The topside is surfaced with mineral aggregate and the underside is surfaced with protective polyolefin release film that is removed during application.
Prior to installation, unroll LASTOBOND ECO onto the roof surface and allow to relax. LASTOBOND ECO may be applied to plywood, OSB board, wood plank, concrete or masonry. Place LASTOBOND ECO in desired position. Remove the protective release film from the underside of the sheet and roll LASTOBOND ECO into place with a hand roller. Refer to the SOPREMA® SBS Roofing Manual for additional application guidelines.