Bison Roofing Underlay

Materials
Bison Roofing Underlay is a diffusion tight roofing underlay. It consists of reinforced HD polyethylene coated with LD polyethylene on both sides. The roofing underlay is UV and alkali stabilized. IQD 128 means that the product is third party audited to ensure quality over time.

Product description
Bison Roofing Underlay meet the Swedish Work Environment Authority’s requirements for anti-trampling protection in ceilings and floors. The roofing underlay is air and vapor tight. Installation is free-hanging directly on the roof trusses. Either parallel or perpendicular to the roof pitch. The maximum distance between the roof trusses is 1500 mm. The roof pitch must be at least 14 ̊.

Function
Bison Roofing Underlay is used as a water-repellent layer under the roof. The roofing underlay drains condensation and any drift water that has found its way under the roof. This prevents moisture leakage into the structure. In addition to its purpose as a roofing underlay, the product can also be used as a safety foil (air and vapor barrier with anti-trampling protection) in joists. The product is sometimes also called combination foil.

Advantages
The low weight (145 g/m2) allows easy and smooth installation. This can be compared to tongued and grooved board (10-12 kg/m2). Bison Roofing Underlay is therefore both more economical to transport and easier to handle on site. The material is quick to install, which means that you quickly get weather protection.

Storage
Bison Roofing Underlay is stored in unbroken packaging or so that it is not exposed to moisture, heat or UV light.