​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:

  1. ASTM C1177 type sheathings, including DensGlass™ or DensElement™ exterior sheathing, eXP™ sheathing, GlasRoc® sheathing, Securock™ glass-mat sheathing, Weather Defense™ Platinum sheathing, GreenGlass® sheathing

  2. PermaBase™ brand cement board by National Gypsum (or other ASTM C1325 Type A Exterior approved cement boards)

  3. Untreated Exposure I or exterior plywood sheathing (grade C-D or better)

  4. Untreated Exposure I OSB

  5. Gypsum sheathing (ASTM C79/ASTM C1396)

  6. Poured concrete/unit masonry  

ACROSTOP RS should not be used for below grade applications or on surfaces subject to water immersion.