Novia’s B2 building paper is a polyethylene coated kraft paper that’s designed for use in temporary protection, external cladding render backing in timber frames, floor screed layers and other temporary installations. Whilst it meets waterproof requirements in Class B BS 1521, this product is not intended for permanent application. It’s non-reinforced and features excellent grease and solvent resistance. Novia B2 Building Paper Specification Length: 100mWidth: 1mMoisture Vapour Resistance: 85 MNs/g