SOPRAVAP’R™ is an SBS-modified bitumen vapor barrier for use in approved multi-ply membrane and flashing assemblies. SOPRAVAP’R is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with a high tack self-adhesive specifically designed for use with steel decks. The topside is surfaced with high strength tri-laminate polyethylene film and the underside is surfaced with protective polyolefin release film that is removed during application.

Product Properties

  • ASTM ASTM D2178, ASTM E96
  • Installation Method Self Adhered
  • Thickness 31.5 mils (0.8 mm)
  • Topside Polyethylene Film
  • Underside Release Film


Prior to installation, unroll SOPRAVAP’R onto the roof surface and allow to relax. SOPRAVAP’R may be applied to steel, plywood, gypsum, concrete, or asphalt panels. Place SOPRAVAP’R in desired position. Remove the protective release film from the underside of the sheet and roll SOPRAVAP’R into place with a weighted roller.


Testing & Approvals

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Related Projects

John R. Oishei Children’s Hospital – Buffalo, New York

SOPREMA’s SOPRASEAL® Xpress G air and vapor barrier was ideal for this project. The exterior grade, inorganic faced gypsum board with an air and vapor barrier factory applied to the exterior surface, is the first and only ABAA evaluated assembly. SOPRASEAL® Xpress G boards are mechanically fastened to the structure using corrosion resistant SOPRASEAL® Xpress G Screws. A 6 inch self-adhered strip of SOPRASEAL® Stick 1100T is then installed over all board joints.

Holiday Inn Express – Medina, Ohio

SOPREMA®’s SOPRASEAL® Stick VP self-adhered vapor-permeable air barrier membrane was installed to ensure a continuous air barrier with no moisture infiltration for this wall assembly requiring a “breathable” characteristic. It creates a solid barrier against air infiltration and exfiltration, which minimizes associated energy loss and condensation problems.