The mission of the organization is to promote the growth of the engineered rainscreen products industry to improve moisture management in building enclosures through technical advocacy. BEMMI is organized to represent manufacturers and suppliers of drainage space materials used in exterior walls in the residential and commercial building construction markets.
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.