Polyfoam Slimline Membrane

Polyfoam Slimline Membrane is a high performance, non-woven polyethylene geotextile membrane that acts to resist the passage of water, but is vapour permeable. It is used in combination with Polyfoam Roofboard as part of the Polyfoam Slimline System for protected membrane roofing.

Polyfoam Slimline Membrane is for use as a separating and filtration layer in low moisture impact protected membrane flat roofs. The water resistant properties of the Polyfoam Slimline Membrane result in it reducing the flow of water through the roof construction. This means that the normal impact on thermal performance by rainwater cooling is negated compared with using a standard filtration membrane. This has been confirmed in tests carried out by the British Board of Agrément, as part of the third party certification of the Polyfoam Slimline System. As the Polyfoam Slimline membrane is vapour permeable, moisture does not become trapped in the insulation layer, but can evaporate up through the Polyfoam Slimline membrane. The use of the Polyfoam Slimline Membrane offers superior thermal performance – so by using the same thickness of Polyfoam Roofboard you can achieve superior U-values. Protected membrane flat roofs using the Polyfoam Slimline system are lighter as less ballast is required. This is due to a vastly reduced floatation impact as more drainage occurs above the insulation rather than below it.