MODIFIED SOPRA G is an SBS-modified bitumen-coated base sheet for use as an anchor sheet for cold adhesive, heat welded or hot asphalt applied roof assemblies. MODIFIED SOPRA G is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with a high quality random glass fiber mat. The topside and underside are surfaced with fine mineral aggregate.

Product Properties

  • ASTM ASTM D4601
  • Material Nailable Base/Anchor Sheet
  • Type G2


Position MODIFIED SOPRA G in desired position and fasten if being used with a nailable substrate. If using MODIFIED SOPRA G in a BUR application, apply hot asphalt according to manufacturer’s specifications, and then roll in Modified SOPRA G. Subsequent approved inter-ply or cap ply membranes are applied to MODIFIED SOPRA G via cold adhesive, heat welding or hot asphalt. Refer to the SOPREMA® SBS Roofing Manual for additional application guidelines.

Testing & Approvals

FBC FL13806-R8  Liquid-Applied Roof Systems FM ICC-ES ESR-5561 Miami-Dade UL

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