{"title":"Flat Roof Ventilation | Roofing Supplies","description":"\u003cp data-start=\"221\" data-end=\"624\"\u003eFlat roof ventilation is essential for maintaining airflow, reducing moisture build-up and protecting both warm and cold flat roof structures. Proper ventilation prevents condensation, damp, mould and long-term damage to insulation and roof decking. Suitable for garages, extensions, commercial buildings and modern home builds, flat roof ventilation ensures a healthier and more durable roofing system.\u003c\/p\u003e\n\u003ch3 data-start=\"626\" data-end=\"682\"\u003eFlat Roof Air Vents for Effective Moisture Control\u003c\/h3\u003e\n\u003cp data-start=\"683\" data-end=\"1015\"\u003e\u003ca href=\"\/products\/vent-flat-roof-terminal-extra-aqua-breather-vent-and-cap\" title=\"Flat roof air vents\"\u003e\u003cstrong data-start=\"683\" data-end=\"706\"\u003eFlat roof air vents\u003c\/strong\u003e\u003c\/a\u003e help regulate airflow and prevent warm, humid air from becoming trapped within flat roof layers. By allowing moisture to escape, \u003cstrong data-start=\"836\" data-end=\"859\"\u003eflat roof air vents\u003c\/strong\u003e protect insulation and structural materials from condensation and long-term deterioration. They are ideal for both new installations and retrofit upgrades.\u003c\/p\u003e\n\u003ch3 data-start=\"1017\" data-end=\"1081\"\u003eFlat Roof Ventilation for Warm and Cold Roof Constructions\u003c\/h3\u003e\n\u003cp data-start=\"1082\" data-end=\"1313\"\u003e\u003ca href=\"\/products\/ubbink-oft-2-flat-roof-construction-vent-110mm\" title=\"Flat roof ventilation\"\u003e\u003cstrong data-start=\"1082\" data-end=\"1107\"\u003eFlat roof ventilation\u003c\/strong\u003e\u003c\/a\u003e systems are engineered for use in both warm and cold roof setups. They help maintain stable internal temperatures, reduce humidity levels and prevent moisture issues from forming beneath roofing membranes.\u003c\/p\u003e\n\u003ch3 data-start=\"1315\" data-end=\"1379\"\u003eDurable, Weatherproof Materials for Year-Round Performance\u003c\/h3\u003e\n\u003cp data-start=\"1380\" data-end=\"1642\"\u003eManufactured from UV-stable, impact-resistant materials, flat roof vents are designed to withstand harsh UK weather while maintaining consistent airflow. Many models include built-in barriers to prevent water, debris and insects from entering the roof structure.\u003c\/p\u003e\n\u003ch3 data-start=\"1644\" data-end=\"1699\"\u003eEasy Installation Across Multiple Flat Roof Types\u003c\/h3\u003e\n\u003cp data-start=\"1700\" data-end=\"1911\"\u003eThese ventilation products can be installed with felt, single-ply membranes, EPDM or GRP roofs. Their simple installation process allows them to be fitted during construction or added as part of a refurbishment.\u003c\/p\u003e\n\u003ch2 data-start=\"1913\" data-end=\"1920\"\u003eFAQs\u003c\/h2\u003e\n\u003ch4 data-start=\"1922\" data-end=\"1976\"\u003eDo flat roof air vents help prevent condensation?\u003c\/h4\u003e\n\u003cp data-start=\"1977\" data-end=\"2115\"\u003eYes — \u003cstrong data-start=\"1983\" data-end=\"2006\"\u003eflat roof air vents\u003c\/strong\u003e reduce the build-up of condensation by allowing moisture-laden air to escape from inside the roof structure.\u003c\/p\u003e\n\u003ch4 data-start=\"2117\" data-end=\"2188\"\u003eAre flat roof ventilation products suitable for warm roof systems?\u003c\/h4\u003e\n\u003cp data-start=\"2189\" data-end=\"2334\"\u003eAbsolutely. \u003cstrong data-start=\"2201\" data-end=\"2226\"\u003eFlat roof ventilation\u003c\/strong\u003e options are available for both warm and cold roof designs to ensure healthy airflow and protect insulation.\u003c\/p\u003e\n\u003ch4 data-start=\"2336\" data-end=\"2391\"\u003eCan flat roof vents be fitted to an existing roof?\u003c\/h4\u003e\n\u003cp data-start=\"2392\" data-end=\"2510\"\u003eYes — many \u003cstrong data-start=\"2403\" data-end=\"2426\"\u003eflat roof air vents\u003c\/strong\u003e are suitable for retrofit installation, making them ideal for upgrades and repairs.\u003c\/p\u003e\n\u003cp data-start=\"2392\" data-end=\"2510\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"2392\" data-end=\"2510\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 107%; font-family: 'Arial',sans-serif; mso-fareast-font-family: Aptos; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;\"\u003eCheck out our other \u003cb\u003e\u003ca href=\"\/collections\/roofing-supplies\" title=\"Roofing Supplies\"\u003eRoofing Supplies\u003c\/a\u003e \u003c\/b\u003eand\u003cb\u003e \u003ca href=\"\/collections\/roof-ventilation\" title=\"Roof Ventilation\"\u003eRoof Ventilation\u003c\/a\u003e \u003c\/b\u003erange at JJ Building Materials\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"ubbink-oft-5-insulated-flat-roof-terminal","title":"Ubbink OFT 5 Insulated Flat Roof Terminal","description":"The Ubbink OFT 5 Insulated Flat Roof Terminal is a high-performance solution designed for both mechanical and passive ventilation systems, including those used with heat recovery units and high-volume extract fans. Engineered for modern building requirements, it’s suitable for new builds and renovation projects alike.\n\nWhat sets the OFT 5 apart is its superior insulation value above the roof level, which helps reduce the risk of condensation forming inside the terminal—especially important in colder climates or high-humidity applications.\n\n\u003ch3\u003eHigh Performance and Versatile Installation\u003c\/h3\u003e\n\nThanks to its large free vent area and low pressure (Pa) resistance, this terminal supports excellent ventilation capacity, ensuring your systems operate efficiently. The unit is manufactured from high-quality polypropylene (PP), making it strong, durable, and resistant to all weather conditions.\n\nIt’s designed for flexibility and can be installed on a wide variety of flat roof finishes, including:\n\nAsphalt\n\nBuilt-up felt\n\nEPDM\n\nBitumen\n\nGRP roofing systems\n\nThe internal spigot measures 166mm, except on the OFT 5 180mm variant, and reducers are included to allow compatibility with other duct sizes.\n\n\u003ch3\u003eDesigned for Function and Style\u003c\/h3\u003e\n\nBeyond its technical advantages, the OFT 5 terminal also features an elegant, low-profile design that looks clean and professional once installed. The terminal is fully insulated up to the cowl, ensuring consistent performance throughout its structure.\n\nWhether you're working on a high-spec new build or upgrading an older ventilation system, the OFT 5 delivers reliability, efficiency, and aesthetic appeal in one complete package.\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\nIdeal for heat recovery units and high-volume extract systems\n\nSuitable for mechanical and passive (natural) ventilation\n\nLarge free vent area with low pressure drop\n\nInternal spigot: 166mm (with reducers included)\n\nMade from high-quality, weather-resistant polypropylene\n\nFully insulated right up to the cowl\n\nCompatible with asphalt, felt, EPDM, bitumen, and GRP flat roofs\n\nSleek, modern design suitable for new builds or retrofits\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003e1. Can the OFT 5 be used on all types of flat roofing?\u003c\/h4\u003e Yes, it’s compatible with a wide range of flat roof finishes including **asphalt, built-up felt, EPDM, bitumen, and GRP**, making it highly versatile for both modern and traditional roofing systems. \u003cbr\u003e \u003ch4\u003e2. What size ducting is the OFT 5 compatible with?\u003c\/h4\u003e The standard internal spigot is **166mm**, but **reducers are included** with the unit to ensure compatibility with smaller duct sizes if needed. \u003cbr\u003e \u003ch4\u003e3. Does the insulation run throughout the whole unit?\u003c\/h4\u003e Yes, the OFT 5 is **fully insulated up to the cowl**, helping to prevent condensation and thermal bridging, particularly in colder conditions.\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\/flat-roof-ventilation\"\u003eflat roof ventilation\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Ubbink","offers":[{"title":"Asphalt \/ 125mm","offer_id":50536030896470,"sku":"51064","price":62.39,"currency_code":"GBP","in_stock":true},{"title":"Asphalt \/ 150mm","offer_id":50536030929238,"sku":"51065","price":62.39,"currency_code":"GBP","in_stock":true},{"title":"Asphalt \/ 180mm","offer_id":50536030962006,"sku":"51066","price":82.81,"currency_code":"GBP","in_stock":true},{"title":"Bitumen \/ 125mm","offer_id":50536030994774,"sku":"51069","price":76.95,"currency_code":"GBP","in_stock":true},{"title":"Bitumen \/ 150mm","offer_id":50536031027542,"sku":"51070","price":72.32,"currency_code":"GBP","in_stock":true},{"title":"EPDM \/ 125mm","offer_id":50536031060310,"sku":"51067","price":75.23,"currency_code":"GBP","in_stock":true},{"title":"EPDM \/ 150mm","offer_id":50536031093078,"sku":"51068","price":70.89,"currency_code":"GBP","in_stock":true},{"title":"PVC \/ 125mm","offer_id":50536031125846,"sku":"51071","price":73.01,"currency_code":"GBP","in_stock":true},{"title":"PVC \/ 150mm","offer_id":50536031158614,"sku":"51072","price":68.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/ubbink-oft-5-insulated-flat-roof-terminal-6253832.jpg?v=1772662517"},{"product_id":"ubbink-oft-2-flat-roof-construction-vent-110mm","title":"Ubbink OFT 2 Flat Roof Construction Vent 110mm","description":"The Ubbink OFT 2 Flat Roof Construction Vent is a 110mm breather vent designed specifically for built-up felt roofing systems. Whether you’re working on a new build or a roof renovation, this vent provides a reliable way to ventilate construction voids and reduce the risk of trapped moisture.\n\nIts low-profile design ensures a discreet finish, making it ideal for maintaining a clean, professional roofline appearance without compromising performance.\n\n\u003ch3\u003eEfficient Ventilation, Built to Last\u003c\/h3\u003e\n\nThe OFT 2 features a large free ventilation area, allowing it to efficiently release trapped air and moisture from below the roof structure. This makes it particularly useful in flat roof constructions where breathability is essential to prevent condensation and long-term damage.\n\nMade from high-quality polypropylene (PP), the vent is built to handle all weather conditions. It won’t warp, degrade, or crack, even under prolonged UV exposure or extreme temperatures, ensuring lasting performance and reliability.\n\n\u003ch3\u003eDesigned for Practicality and Style\u003c\/h3\u003e\n\nIn addition to its functional benefits, the OFT 2 also boasts an elegant, unobtrusive design. Its minimalist profile allows it to blend into the roofing surface while continuing to provide essential airflow. It’s a smart choice for roofers and contractors looking for a dependable construction vent that doesn’t compromise on aesthetics.\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n110mm breather void vent for built-up felt roofs\n\nProvides high free vent area for efficient airflow\n\nLow-profile, discreet design for visual consistency\n\nMade from durable, weather-resistant polypropylene\n\nSuitable for both new builds and refurbishment projects\n\nPerforms reliably in all weather conditions\n\nSleek finish for a modern, clean appearance\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003e1. What is the main purpose of the OFT 2 vent?\u003c\/h4\u003e The OFT 2 is used to ventilate **construction voids** in built-up felt roof systems, helping to release moisture and prevent condensation build-up beneath the roofing layers. \u003cbr\u003e \u003ch4\u003e2. Is this vent suitable for other roofing materials?\u003c\/h4\u003e The OFT 2 is specifically designed for **built-up felt roofing**, and may not be suitable for other types like EPDM or GRP without additional compatibility checks. \u003cbr\u003e \u003ch4\u003e3. Will the vent hold up in extreme weather conditions?\u003c\/h4\u003e Yes. Made from **high-quality polypropylene**, the OFT 2 is built to withstand **harsh weather**, including rain, snow, UV exposure, and temperature fluctuations.\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\/flat-roof-ventilation\"\u003eflat roof ventilation\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Ubbink","offers":[{"title":"Default Title","offer_id":50536031191382,"sku":"8277","price":14.35,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/ubbink-oft-2-flat-roof-construction-vent-110mm-4533124.jpg?v=1772662517"},{"product_id":"vent-flat-roof-terminal-aluminium-breather-vent","title":"Areco Vent - Flat Roof Terminal Aluminium Breather Vent","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\nThe Vent-Flat Roof Terminal Aluminium Breather Vent is expertly manufactured from high-quality spun aluminium, ensuring long-lasting durability and weather resistance. Designed for flat roof applications, this breather vent allows trapped moisture within roofing systems to escape efficiently, protecting your roof from long-term damage. The vent’s top is securely fixed to the base with a self-tapping screw, providing a reliable and easy-to-install solution for both new and existing roofs.\n\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\nHeight: 180mm\n\nDiameter of base: 240mm\n\nDiameter of aperture: 165mm\n\nEach aluminium breather vent is capable of ventilating an area of up to 25 square metres, offering excellent coverage and performance for various roofing projects.\n\n\u003ch3\u003eWhy Proper Ventilation Matters\u003c\/h3\u003e\n\nMoisture is a common issue in roofing systems, especially in newly constructed roofs. After a concrete deck is screeded and waterproofed, residual moisture often remains trapped within the structure. Without proper ventilation, this trapped moisture can cause a range of problems, including:\n\nBlistering of asphalt or felt roof coverings\n\nStress and damage from expansion and contraction on the weathering membrane\n\nCondensation forming at ceiling level, leading to dampness and potential mould growth\n\nBy installing Breather Vents in the waterproofing layers of the roof, this moisture is given a safe escape route, significantly extending the life of your roof and maintaining a healthy internal environment.\n\n\u003ch3\u003ePreparation Before Installation\u003c\/h3\u003e\n\nBefore installation, ensure that the roof surface is clean, stable, and prepared for vent integration. For new roofs, consider the moisture present in screeded concrete decks. Proper placement and sealing of the breather vent will allow effective moisture escape and prevent future roofing complications.\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003e1. What type of roofs can the Aluminium Breather Vent be used on?\u003c\/h4\u003e This vent is specifically designed for **flat roofs** with waterproofing layers such as asphalt, felt, or single-ply membranes. It’s suitable for both **new builds** and **roof refurbishments**. \u003ch4\u003e2. How many vents do I need for my roof?\u003c\/h4\u003e Each Aluminium Breather Vent can effectively ventilate up to **25 square metres** of roofing area. For larger roofs, multiple vents should be installed evenly to ensure balanced ventilation across the surface. \u003ch4\u003e3. Does the vent require maintenance after installation?\u003c\/h4\u003e Minimal maintenance is needed. It’s recommended to **inspect the vent periodically** to ensure it remains free of debris and the aperture is unobstructed for optimal performance.\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\/flat-roof-ventilation\"\u003eflat roof ventilation\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Areco","offers":[{"title":"Default Title","offer_id":51507061195094,"sku":"4400","price":12.57,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/areco-vent-flat-roof-terminal-aluminium-breather-vent-7559457.jpg?v=1772656585"},{"product_id":"vent-flat-roof-terminal-extra-aqua-breather-vent-and-cap","title":"Areco Vent - Flat Roof Terminal Extra Aqua Breather Vent And Cap","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\nThe Vent-Flat Roof Terminal Extra Aqua Breather Vent and Cap is a high-performance roof ventilation solution designed to protect flat roof systems from trapped moisture. Expertly manufactured from durable polypropylene, this vent features a grey base and a white dome cover, providing both strength and a clean, modern appearance. The dome is securely fixed to the base with a screw set into a self-locking brass insert, ensuring long-lasting stability and resistance against weathering.\n\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\nHeight: 197mm\n\nDiameter of base: 267mm\n\nDiameter of aperture at base: 184mm\n\nEach Extra Aqua Breather Vent can effectively ventilate an area of up to 36 square metres, making it ideal for larger roof spaces that require superior airflow and moisture release.\n\n\u003ch3\u003eWhy Choose the Extra Aqua Breather Vent\u003c\/h3\u003e\n\nFlat roofs are particularly susceptible to moisture becoming trapped beneath waterproofing layers — a common issue that can lead to blistering, cracking, and long-term structural damage. The Extra Aqua Breather Vent provides a simple yet effective solution, allowing built-up moisture and vapour to escape safely from within the roof system.\n\nThis not only extends the life of the roof membrane, but also reduces internal condensation and helps maintain a stable internal environment. Its durable polypropylene construction ensures it withstands harsh weather conditions, while the attractive grey and white finish blends seamlessly with most roof designs.\n\n\u003ch3\u003eInstallation and Performance\u003c\/h3\u003e\n\nDesigned for quick and straightforward installation, the Extra Aqua Breather Vent can be integrated into new or existing flat roofing systems. Once fitted, it begins working immediately to improve ventilation efficiency across the surface area, providing long-term protection against moisture-related issues.\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003e1. What materials is the Extra Aqua Breather Vent made from?\u003c\/h4\u003e It’s constructed from **high-quality polypropylene**, featuring a grey base and a white dome cap. The dome is secured with a screw into a **self-locking brass insert**, providing strength and corrosion resistance. \u003ch4\u003e2. How much roof area can one vent cover?\u003c\/h4\u003e Each vent can efficiently ventilate up to **36 square metres** of roof space. For larger areas, multiple vents should be installed evenly to maintain consistent airflow and moisture release. \u003ch4\u003e3. Is the vent suitable for both new and existing roofs?\u003c\/h4\u003e Yes, the Extra Aqua Breather Vent is suitable for **both new roof constructions and refurbishment projects**. It can be installed on a range of flat roofing systems, including asphalt, felt, and single-ply membranes.\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\/flat-roof-ventilation\"\u003eflat roof ventilation\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Areco","offers":[{"title":"Default Title","offer_id":51507061686614,"sku":"4399","price":10.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/areco-vent-flat-roof-terminal-extra-aqua-breather-vent-and-cap-5005265.jpg?v=1772656584"}],"url":"https:\/\/jjbuildingmaterials.co.uk\/collections\/flat-roof-ventilation.oembed","provider":"JJ Building Materials","version":"1.0","type":"link"}