Wunderlay 120 Type HR Roof Underlay (120gsm, 1m x 45m) Reliable heavyweight vapour impermeable roofing underlay High-performance 120gsm Type HR roofing underlay designed to provide a robust secondary barrier beneath pitched slate and tile systems. Fully waterproof and air-tight, Wunderlay delivers protection against wind-driven rain and snow while resisting wind uplift pressures. It is the recommended choice for all Tapco Roofing products, including TapcoSlate Classic. Manufactured from a durable twin-ply polypropylene spunbond and LDPE/PP film, Wunderlay combines high tensile strength with excellent nail tear resistance for secure fixing. The absorbent underside prevents condensate drip-off, while the embossed upper surface minimises glare and allows accurate chalk line marking. Lightweight but highly durable, the easy-to-handle underlay can also serve as a temporary roof covering. Features & Benefits Type HR classified – vapour impermeable traditional roofing underlay Fully waterproof – Class W1 rating with >2.0m hydrostatic head resistance Condensation control – absorbent underside prevents drip-off Secure fixing – excellent tensile strength and nail tear resistance Wind resistant – reduces uplift pressures and eliminates nuisance wind noise Durable covering – UV & heat tested for use as temporary roof covering Installer friendly – embossed anti-glare surface for clear chalk markings Certified quality – CE marked and BM TRADA approved Did you know? Unlike low-resistance (Type LR) underlays, high-resistance (Type HR) underlays are non-permeable and non-breathable, blocking all air and water vapour. They act as a full secondary barrier but require careful roof ventilation.
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