DuPont Tyvek HomeWrap is the original house wrap, incorporating unique material science that helps keep air and water out, while letting water vapor escape. As a result, it can contribute to improved building durability by helping to protect homes against damaging wind and rain that can penetrate the exterior cladding. DuPont Tyvek HomeWrap is a house wrap engineered to keep homes cool in the summer, warm in the winter and dry all year round. Tyvek HomeWrap can also reduce home energy bills by controlling air flow and water intrusion, which helps insulation work better, allowing the HVAC system to work more efficiently.