Today's home buyers recognize DuPont™ Tyvek® as a mark of quality. With more than 25 years of residential performance on millions of homes breathable DuPont™ Tyvek® weather barrier membranes and flashing systems help create a sealed building enclosure that helps stop airflow through the walls, holds out bulk water and wind-driven rain and allows moisture vapors to escape from within - that can deliver more comfortable, more energy-efficient homes.