Crafted from wet-strength kraft paper and designed to meet the technical standards of BS 152, Class A1F, for waterproof building materials, this product incorporates a polymer-reinforced scrim. It serves as an excellent choice for situations demanding added strength and durability. This product is particularly well-suited for installation beneath a nail-down timber floor when applied directly onto a timber substrate. It finds common application as a moisture barrier, underlay for uninsulated cladding, separation layers, bond breaks, draught and damp exclusion barriers. Available in the following size: 1000 mm x 25m Key Specifications: Moisture Vapor Resistance: Minimum of 53 MNs/g Tensile Strength BS 4415 (Dry): Minimum of 12.4 kN/m (Machine Direction), 7.20 kN/m (Cross Direction) Bursting Strength BS 3137 (Dry): Minimum of 550 kN/m2 Liquid Water Resistance Minimum: 24 Hours Upper Temperature Stability: Maintains integrity at temperatures exceeding 70 degrees Celsius Chemical Resistance: Resistant to chemicals commonly found in plaster and cement Biological Resistance: Does not attract insects or vermin Average Grammage: 268gsm