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BackerBead® from ClarkDietrich Passes ASTM E-331 Testing

ClarkDietrich, West Chester, Ohio, announces that its BackerBead® vinyl accessory product has passed testing under ASTM E-331, Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference. This test method determines the resistance to water penetration for exterior windows, curtain walls, skylights and doors when applied under uniform static air pressure differences.


The test is a real-world simulation that compared the use of no backer-rod/casing bead in terminating a stucco system around a window opening versus the same stucco assembly with the ClarkDietrich BackerBead. In side-by-side tests, the BackerBead system with sealant passed the E-331 water-penetration test, simulating air pressure of a 50 mph wind/rain. Conversely, the stucco system terminated with no isolated jointing failed in less than 15 minutes.


Tests were performed by Fenestration Testing Laboratory in Miami in April 2018.

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