... house, vapor permeable housewrap, roof membrane, roofing membrane, roof underlay, roof underlayment waterproof breathable housewrap felt / water resistant / ... within the wall cavity to escape by diffusion through the membrane to the exterior, andto act as a wind barrier to ... 30%-30%/-30%-30%/-30%penetrationEN13859-1W1W1W1W1W1W1 breathable wrap house membrane / vapor permeable house wrap / housewrap