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    ​​​​​​​​​​​​​​​​Acrostop RS

    Acrostop RS is a one-component fluid-applied vapor permeable air/water-resistive barrier. Waterproof and resilient, it may be spray-, roller-, trowel-, or brush-applied directly to approved wall substrates.

    It provides excellent secondary moisture protection behind most wall claddings including EIFS, stucco (slip sheet required), brick, siding and metal panels.



    ​Can be used with most code-compliant claddings

    ​One continuous air/water-resistive barrier for buildings with multiple claddings

    ​Meets ASTM D 1970 nail sealability requirements with and without Sheathing Fabric

    ​Self-sealing performance

    ​One component, low VOC formulation

    ​Easy to apply, meets VOC requirements in all 50 states

    ​Approved for Acrocrete Wall Systems

    ​Full system warranty with Acrocrete EIFS and stucco wall claddings


    ​Cleans up with water; solvents and citrus-based cleaners are not required

    ​Tough, abrasion resistant

    ​Rugged membrane resists damage after installation

    ​Nonflammable as applied

    ​Promotes workplace safety

    ​180 day outdoor exposure rating (30 days if used as part of an adhesively fastened wall system)

    ​Flexible construction scheduling


    Acrostop RS is used as a vapor permeable air/water-resistive barrier over the following exterior wall substrates:
    • ASTM C1177 type sheathings, including DensGlass™ or DensElement™ exterior sheathing, eXP™ sheathing, GlasRoc® sheathing, Securock™ glass-mat sheathing, Weather Defense™ Platinum sheathing, GreenGlass® sheathing
    • PermaBase™ brand cement board by National Gypsum (or other ASTM C1325 Type A Exterior approved cement boards)
    • Untreated Exposure I or exterior plywood sheathing (grade C-D or better)
    • Untreated Exposure I OSB
    • Gypsum sheathing (ASTM C79/ASTM C1396)
    • Poured concrete/unit masonry
    Acrostop RS should not be used for below grade applications or on surfaces subject to water immersion.​​​​
    Acrostop RS Product Bulletin Teaser Image

    Acrostop RS Product Bulletin

    Additional Downloads


    Material Safety Data Sheets