Engineered with vertical grooves to provide enhanced drainage behind claddings such as primed wood, fiber cement siding and foam board while allowing moisture vapor to pass through to promote drying in wall systems. DuPont Tyvek DrainWrap is a moisture barrier designed to provide enhanced drainage in areas subject to extreme, wind driven rain. DuPont Tyvek DrainWrap combines the superior air and water resistance, vapor permeability and strength of Tyvek with a vertically grooved surface, to help channel water safely to the outside.