EXY® open cell foam is spray-applied as a liquid and expands within seconds to 150 times its liquid volume. The foam adheres directly to the substrate forming a seamless and permanent coverage over and around even the most difficult shapes. This seal provides superior energy efficiency and improved indoor air quality by eliminating air movement. Once in place, EXY® open cell foam maintains its performance for the life of the building. Unlike many conventional insulations, time and temperature changes have no effect on R-value of spray foam insulation.