{"product_id":"cromar-vent-3-pro-breathable-membrane","title":"Cromar Vent 3 Pro Breathable Membrane","description":"\u003ch2\u003eCromar Vent 3 Pro 165gsm Breathable Membrane\u003c\/h2\u003e\n\nThe Cromar Vent 3 Pro 165gsm Breathable Membrane is a premium triple-layer roofing underlay designed for both cold and warm pitched roofs. Made from high-quality spun-bonded polypropylene with a micro-porous film, it provides excellent moisture permeability while remaining water-resistant, ensuring your roof structure stays dry and protected. Suitable for both fully supported and unsupported tiled or slated roofs, Vent 3 Pro is the ideal solution for new builds, refurbishments, and ventilated or unventilated roof systems.\n\n\u003ch3\u003eReliable Weather Protection\u003c\/h3\u003e\n\nVent 3 Pro acts as a secondary barrier beneath tiles and slates, offering robust protection against wind-driven rain while allowing moisture vapour to escape. This reduces the risk of condensation, prolongs roof life, and enhances overall durability. Its tensile strength and water resistance make it an ideal choice for a wide range of pitched roof applications.\n\n\u003ch3\u003eQuality Material \u0026amp; Performance\u003c\/h3\u003e\n\nConstructed from spunbonded polypropylene, the membrane is lightweight, flexible, and easy to install. Its triple-layer design ensures superior tear resistance and reliable performance even in challenging weather conditions. The membrane is BBA certified, CE and UKCA marked, and conforms to NHBC guidelines as well as BS 5250:2021 for moisture management, giving you confidence in both compliance and performance.\n\n\u003ch3\u003ePackaging \u0026amp; Handling\u003c\/h3\u003e\n\nAvailable in 1m x 50m and 1.5m x 50m rolls, packaged in pallets of 56 and 48 rolls respectively.\n\nFor safe handling, rolls should be lifted, not dragged, and stored upright on a dry surface.\n\nAvoid prolonged exposure to direct sunlight during storage to prevent damage.\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\nBrand: Cromar\n\nWeight: 165gsm\n\nMaterial: Spunbonded polypropylene with micro-porous film\n\nRoof Types: Cold and warm pitched roofs\n\nApplications: Fully supported or unsupported tiled and slated roofs\n\nCompliance: BBA certified, CE \u0026amp; UKCA marked, NHBC approved, BS 5250:2021\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003e1. What is Vent 3 Pro used for?\u003c\/h4\u003e The **Vent 3 Pro membrane** acts as a breathable roofing underlay, providing secondary weather protection under tiles or slates while allowing moisture vapour to escape, reducing condensation risk. \u003ch4\u003e2. Can it be used on all pitched roofs?\u003c\/h4\u003e Yes. It is suitable for both **cold and warm pitched roofs**, and works with **fully supported or unsupported** tiled and slated roofs. \u003ch4\u003e3. Is the membrane compliant with building standards?\u003c\/h4\u003e Absolutely. Vent 3 Pro is **BBA certified**, **CE \u0026amp; UKCA marked**, **NHBC approved**, and meets **BS 5250:2021** standards for moisture control, making it suitable for UK and European construction projects. \u003ch4\u003e4. How should I store and handle the rolls?\u003c\/h4\u003e Rolls should be **lifted, not dragged**, and stored upright on a dry surface. Avoid exposure to direct sunlight during storage to maintain product integrity.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/roofing-supplies\"\u003eroofing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/breathable-felts\"\u003ebreathable felts\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Cromar","offers":[{"title":"1.5m x 50m","offer_id":51570092278102,"sku":"4014","price":82.03,"currency_code":"GBP","in_stock":true},{"title":"1m x 50m","offer_id":51570092310870,"sku":"33873","price":54.69,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/cromar-vent-3-pro-breathable-membrane-7009617.jpg?v=1772656461","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/cromar-vent-3-pro-breathable-membrane","provider":"JJ Building Materials","version":"1.0","type":"link"}