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50m. Protect VP400 vapour permeable roofing underlay has excellent nail tear and tensile strength while remaining lightweight and easy to cut. Used as an underlay for warm or cold roof construction, it helps to avoid the risk of roof space condensation. Easily marked with a chalk line. 100% waterproof with unrestricted use in windy areas. UV and heat resistant. BRE certified for all pitched roofs.
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