Bayonet BayoWrap Roof 03 Underlay is your essential second line of defence against moisture and drafts.
Bayonet BayoWrap Roof 03 Underlay is a high-quality, synthetic building underlay for use under roof claddings. It consists of a micro-porous water-resistant film, laminated to two layers of non-woven, spun-bonded polyolefin. It is black on the top face, white on the bottom face and is printed with convenient laying lines.
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