{"product_id":"breathable-roofing-membrane-135gsm","title":"Breathable Roofing Membrane – 135gsm","description":"\u003cp\u003e\u003cstrong\u003e135gsm breathable roofing membrane for use as a pitched-roof underlay beneath tiles and slates.\u003c\/strong\u003e Choose a 1m or 1.5m wide × 50m roll to suit the roof and handling preference.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides a secondary weather-resistant layer beneath the roof covering\u003c\/li\u003e\n\u003cli\u003eAllows water vapour to pass through the underlay\u003c\/li\u003e\n\u003cli\u003eSuitable for tiled and slated pitched-roof build-ups where this type of underlay is specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoose the roll width\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1m × 50m\u003c\/strong\u003e – easier to handle on smaller roofs and tighter working areas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5m × 50m\u003c\/strong\u003e – covers more width per run and can reduce the number of horizontal laps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBreathable does not mean ventilation can always be omitted\u003c\/h3\u003e\n\u003cp\u003eThe ventilation requirement depends on the whole roof build-up, the type of underlay, supporting deck or sarking and the roof covering. Follow the project design and current roofing guidance rather than treating every breathable membrane as a universal replacement for ventilation.\u003c\/p\u003e\n\u003cp\u003eFor graded roof battens, see \u003ca href=\"\/collections\/roofing-battens\"\u003eRoofing Battens\u003c\/a\u003e. For a simple weatherproof covering on a garden shed, use the separate \u003ca href=\"\/collections\/roofing-felt\"\u003eRoofing Felt \u0026amp; Shed Felt\u003c\/a\u003e range.\u003c\/p\u003e","brand":"Wern-wood","offers":[{"title":"1m × 50m","offer_id":54442866737476,"sku":"","price":37.5,"currency_code":"GBP","in_stock":true},{"title":"1.5m × 50m","offer_id":57310288281924,"sku":null,"price":47.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0773\/7068\/7812\/files\/71O27ehHtXL._AC_SX679.jpg?v=1768567607","url":"https:\/\/www.wern-wood.com\/products\/breathable-roofing-membrane-135gsm","provider":"Wern-Wood","version":"1.0","type":"link"}