The Protect Wunderlay is a high-resistance, impermeable underlay. An ideal solution for cold or warm pitched roofs where traditional ventilation is being used, the non-breathable membrane provides a perfect alternative to 1F felt, 5U felts and second-generation plastic sheet materials. Offering impressive wind uplift resistance, the Wunderlay impermeable underlay can be used in wind zones 1-4 without the need for additional sealing tapes. The Wunderlay is completely water and airtight. Its high-quality polypropylene composition is strong and durable, as well as UV and heat resistant, giving you long-lasting peace of mind both during and after construction*. Lightweight at 120 grams per metre squared, the mid-level membrane is easy to cut and handle, and effortless to install. Roofing Supplies UK are pleased to offer the Protect Wunderlay impermeable underlay in two sizes, simply select the option that suits your needs from the dropdown box. Why Choose this Protect Wunderlay Impermeable Underlay? Suitable for cold & warm ventilated pitched roofs Water & airtight UV and heat resistant Strong & durable Lightweight alternative to felts and plastic sheeting UKCA/CE certified Product Specifications: Size: 1m x 45m / 1.5m x 30m (select from dropdown) Colour: Dark grey Weight: 120 g/m² Material: Polypropylene with polyethylene/polypropylene blend film coating Resistance to Water Penetration: W1 Unaged Tensile Strength (MD / CD): 233 / 246 N/50mm Aged Tensile Strength (MD / CD): 231 / 206 N/50mm Nail Tear Strength (MD / CD): 189 / 199 N UV Stability: 3 months Wind Zones: 1-4 at 345mm batten gauge (resistance to wind pressure 1367 Pa), when tested to Annex A of BS 5534 Please note: *An impermeable underlay is not a total waterproof barrier and if used as a temporary waterproof covering, some rain penetration may occur. In certain conditions, particularly if there is persistent heavy rainfall combined with subsequent freeze/thaw conditions, an underlay should not be exposed for more than a few days. In the event of severe weather conditions, the product should be covered with tarpaulin (referenced in BBA Bulletin No 2. “Guide to Good Site Practice”)
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