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Acrostop R

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Acrostop R Product Data Sheet

Typical Details for a Vapor Permeable Air/Water-Resistive Barrier Membrane

ACROSTOP R is a one-component fluid-applied vapor permeable air/water-resistive barrier. This waterproof, resilient coating may be spray-roller-, brush-, or trowel-applied directly to approved above grade wall substrates. It provides excellent secondary moisture protection behind most wall claddings including EIFS, stucco*, brick, siding and metal panels. ACROSTOP R is listed in ICC ESR-2188.* A slipsheet is required for stucco claddings.

For use over the following exterior wall substrates:
ASTM C1177 type sheathings, including DensGlassTM exterior sheathing, e2XPTM sheathing, GlasRoc® sheathing, SecurockTM glass-mat sheathing, Weather DefenseTMPlatinum sheathing, GreenGlass® sheathing, PermaBaseTM cement-board by National Gypsum and other cementboards (ASTM C1325 Type A Exterior), 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. Do not use ACROSTOP R for below-grade applications or on surfaces subject to water immersion.


Approximate coverage rates are as follows:
Over ASTM C1177 Type Sheathing: 35–37 m2 (380–400 ft2) per pail
Over Cement Board: 37–46 m2 (400–500 ft2) per pail
Over Plywood: 23–32 m2 (250–350 ft2) per pail
Over OSB: 23–32 m2 (250–350 ft2) per pail
Over ASTM C79/C1396 Type Sheathing: 46–54 m2 (500–600 ft2) per pail
Over CMU: 9–28 m2 (95–300 ft2 varies with porosity) per pail

27.2 kg per 19-liter pail (60 lbs per 5-gallon pail)
4" SHEATHING FABRIC: 101.5 mm x 54.8 m (4" x 180 ft ) roll
9" SHEATHING FABRIC: 228.5 mm x 54.8 m (9" x 180 ft ) roll