Home Company Products Retailers Documents Contact Product sheet Ce-marking Mounting Instruction Bison Permeable Roofing Underlay 175 Bison Permeable Roofing Underlay 175 is a breathable roofing underlay. It can be mounted on wood board or directly on the wooden rafters. Please note that the roofing underlay is not stepping through protected. No air gap to the wooden base or insulation is needed. The minimum roof pitch for the roofing underlay is 14 °. Should not be mounted on impregnated wood. The roofing underlay is used to protect the roof structure from rain, snow and wind. The material allows unwanted internal water vapor to be transported out through the membrane while it is water and air tight from the outside. The good properties as regards to vapor transport help to protect against moisture and condensation problems. Weight: 175 g/m2 Adhesive edges: 2 Length: 50 m Width: 1,5 m Water vapor resistance: ca 0,9x10³ s/m, sd-value 0,02 m Water tightness: W1 Temperature resistance: - 40° C - + 100° C Tear strength: MD: 170 N, CD: 210 N Elongation: MD: 60%, CD: 80% Tensile strength: MD: 340 N/5 cm, CD: 230 N/5 cm Fire classification: E Accessories: Bison Flex Tape, Butyl tape Back to products Vison Byggprodukter AB Poppelgatan 4, 234 35 Lomma Phone: +46-40-413816, info@vison.se

Home Company Products Retailers Documents Contact Product sheet Ce-marking Mounting Instruction Bison VCL Eco (vapor control layer) Bison VCL Eco is used on the warm side of the wall or roof structure. The membrane is used to seal air and to control the water vapor. Bison VCL Eco works well with Bison House wrap in walls and Bison Permeable Roofing Underlay / Bison Permeable Roofing Underlay 175 for roofs. The VCL Eco is less open to diffusion compared to Bison House Wrap but more permeable than a classic air & vapor barrier. Thereby facilitating it for any construction moisture to dry out / exhale. With Bison VCL Eco you build air tight but open to vapor, so that you do not seal in any moisture. Bison VCL Eco fits all houses where you want a more forgiving design that can breathe. The properties are especially suitable to for example vacation / seasonal housing where the heating occurs periodically. Weight: 180 g/m2 Length: 50 m (standard) Width: 1,5 m (standard) Water vapor resistance: ca 200x10³ s/m, sd-value 5 m (Compare to Bison House Wrap: <0,5 m, Bison Permeable Roofing Underlay: 0,11 m) Tear strength: MD: 490 N/5 cm, CD: 230 N/5 cm Elongation: MD: 3% / CD: 6% Fire classification: E Accessories: Bison Flex Tape, Butyl tape Back to products Vison Byggprodukter AB Poppelgatan 4, 234 35 Lomma Phone: +46-40-413816, info@vison.se