3 layers laminited Breathable Membrane pitched roof underlay, vapor permeable, waterproof, roof breather, house wrap, diffusion 3 layers laminited Breathable Membrane pitched roof underlay, vapor permeable, waterproof, roof breather, house wrap, diffusion, Waterproof, Vapour permeable, Lightweight, Strong, High performance breathable underlay.Breathable Membrane is a high performance breathable ( ...