ANTIROCK and ANTIROCK Starter are SBS-modified bitumen membranes designed to waterproof bridge decks. ANTIROCK is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with tough, dimensionally stable non-woven polyester mat. The topside is surfaced with ceramic coated granules and the underside is surfaced with polyolefin burn-off film to facilitate heat welding. ANTIROCK Starter is used as a starting membrane for ANTIROCK and has a with a selvage of 3 in (75 mm) on each side.

Product Properties

  • Components Cap Sheet


ANTIROCK AND ANTIROCK Starter are mechanically fastened (Macaden, Mini-Macaden) or heat-welded with a propane torch. They must be installed by thermofusion on dry and clean surfaces previously primed with ANTIROCK Primer or ANTIROCK Emulsion Primer. Side lap joints must be a minimum of 3 in (75 mm) and end lap joints must be minimum of 6 in (150 mm). Decks that are to be waterproofed with membrane must conform to the specified surface profile (CSP) of 3-5 of the International Concrete Repair (ICRI). Shotblasting is recommended over the entire surface. Refer to SOPREMA’s ANTIROCK specifications for additional application guidelines.


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Parkland Hospital – Dallas, Texas

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Placer County Water Agency – Auburn, California

In 2015, the Placer County Water Agency took on a tear-off roofing project, in which SOPREMA products were used. SOPREMA was the right choice for this project because the breadth of products met the designer’s needs, including meeting California Title 24 energy efficiency standards with the use of ENERGY STAR® rated SOPRASTAR® Flam. Another appealing aspect was the versatility of SENTINEL® P150, which allowed coverage for the vertical walls throughout the roofing system.