Bayonet BayoWrap Self Support Roof 03 roof underlay is your essential second line of defence against moisture and drafts.
Bayonet Bayowrap Roof 03 consists of a micro-porous water-resistant film, laminated to two layers of non-woven spun bonded polyolefin. It’s black on the top face, white on the bottom face and is printed with handy laying lines.
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