... roof breather, house wrap, diffusion 3 layers laminited Breathable Membrane pitched roof underlay, vapor permeable, waterproof, roof ... permeable, Lightweight, Strong, High performance breathable underlay.Breathable Membrane is a high performance breathable (vapour permeable) underlay for use ... insulation is located along the rafter line.Breathable Membrane is a thermally bonded UV stabilised laminate ...