Performance Building Supply and Keith Bidwell of SIGA gave a workshop in Portland last night on proper air sealing techniques. The seminar provided a hands-on application for an array of SIGA’s products with an emphasis on virtually impermeable interior “Majrex” wrap in combination with an exterior application of the permeable “Majvest.” The two wraps, with the addition of a rainscreen system, promote an exterior assembly that pulls moisture to the exterior of a building to prevent mold. The system is loosely based on a biophilic design of a cactus, but in reverse. The skin of a cactus allows water and moisture into the plant’s interior, where it can be stored, and prevents it from escaping due to the varying properties of the interior cell walls.
SIGA also demonstrated their line of window flashing tapes for openings and penetrations in a building. This workshop showcases step-by-step instructions for building professionals to further building science understanding in Maine. Performance Building Supply is located 111 Fox Street in Portland, ME.