BEMMI members are interested in expanding the understanding, use, and markets for engineered rainscreen products in commercial and residential construction. Together, we work to improve technical knowledge through codes and standards, research and development, and industry outreach. We seek alliances and co-operation with individuals, companies, and associations that share our interest in superior moisture management for building enclosures. Our goal is to improve building durability and reduce the risk from moisture within wall systems for owners, architects, engineers, and contractors. If you are interested in learning more, join us.
Membership Benefits and Opportunities Brochure PDF (701 KB)
Engineered rainscreen materials are specifically designed to manage water within wall systems and to help mitigate potential damage it might cause. One of the most important aspects of durability for the building enclosure is moisture control. Wet wall components can lead to premature failure of wall systems. Because many wall claddings are not water tight, managing water, as either vapor or liquid, has become a critical design criterion. The issue isn’t if water will penetrate, but how to handle the water when it does. Rainscreen membranes add two key performance features to a wall system: drainage and ventilation. The drainage space allows the rapid passage of bulk water harmlessly to the exterior. Ventilation provides enhanced capacity to swiftly dry and moderate humidity within the cavity. Engineered rainscreens can significantly reduce the risk of wall deterioration and improve the durability of the enclosure wall.