PROSOCO, BEI Announce Partnership Words: Dan Kamys PROSOCO, BEI Announce Partnership A worker completes the liquid-applied flashing of a rough opening, without having to use fabrics, tapes or wraps. photo courtesy BEI Manufacturers of building envelope weather- and waterproofing systems, PROSOCO and BEI, have formed a partnership to produce, market and distribute air- and water-resistive barrier component systems using an advanced sealant technology. PROSOCO manufactures products that clean, protect and maintain concrete, brick and stone architecture. PROSOCO products have been used on thousands of landmark buildings nationwide, both new and historic, from the U.S. Capitol to Dallas Cowboys Stadium. BEI (Building Envelope Innovations, LLC) is a science-based construction-material manufacturing company that matches emerging technology with existing needs in the construction industry. The company is known for its rigorous test protocols for building envelopes in real-world conditions, and products and procedures designed to withstand Category 5 hurricanes.