... , Waterproof, Vapour permeable, house wrap, high vapor permeability, roof breather, Ventilative and waterproof membrane, vapor diffusion roof underlay, Waterproof, Vapour permeable, house ... wrap, high vapor permeability, roof breather,Standard for inspection and measurementEN13859-1water resistanceW1breathability2250g/m2/24htensile strengthMD:200N/50MM ; CD ...