{"title":"Airtight Membranes","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eAirtight membranes help reduce draughts and heat loss by limiting uncontrolled air leakage through the building fabric. The right product depends on the construction, where the membrane will be installed and how moisture needs to move through the structure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eDifferent membranes serve different purposes. Internal air and vapour control layers help restrict moisture vapour entering the structure from indoors, while vapour-permeable external airtight membranes allow moisture vapour to escape while limiting air leakage. Both need correctly sealed joints, edges and service openings to form a continuous airtight layer.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBrowse our range below and compare airtight membranes by application, vapour resistance, installation method, fire classification and roll size to find a suitable product for your project.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"tyvek®-airguard®-a2-fr-1-2m-x-50m","title":"Tyvek® AirGuard® A2 FR - 1.2m x 50m","description":"\u003cp\u003eThis DuPont™ AirGuard® A2 Fire-Rated Airtight Vapour Control Layer is a high-performance building material designed to create airtight and watertight building envelopes. It effectively prevents the infiltration of air, moisture, and vapour, safeguarding your property from damage and enhancing energy efficiency.\u003c\/p\u003e\n\u003cp\u003eMeasuring 1200mm x 50m, this AirGuard® A2 Fire-Rated Airtight Vapour Control Layer is suitable for covering large areas of construction projects. It features a laminate of glass fibre mesh with lacquered aluminium foil, providing superior resistance to moisture and air penetration. Additionally, it boasts excellent tear and tensile strength, making it resistant to tearing by hand.\u003c\/p\u003e\n\u003c!----\u003e","brand":"Tyvek","offers":[{"title":"Default Title","offer_id":48651227627867,"sku":"48651227627867","price":477.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/tyvek-airguard-reflective.jpg?v=1720687561"},{"product_id":"tyvek-airguard-control","title":"Tyvek Airguard Control Layer - 1.5m x 50m","description":"\u003cp\u003eDuPont™ AirGuard® Control forms a continuous layer that effectively minimises air leakage, acting as a vapor control barrier to manage both air movement and moisture infiltration within the building’s habitable space.\u003c\/p\u003e\n\u003c!----\u003e","brand":"Tyvek","offers":[{"title":"Default Title","offer_id":48651850449243,"sku":"48651850449243","price":163.1,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/airguard-control-40830.jpg?v=1720708619"},{"product_id":"tyvek-airguard-reflective-1-5m-x-50m","title":"Tyvek Airguard Reflective - 1.5m x 50m","description":"\u003cp\u003eThis strong, 100% airtight vapour barrier is specially designed to maximise thermal performance. Recommended for use with Tyvek® Reflex products, AirGuard® Reflective improves U-values in buildings. This highly vapour and water-resistant, low emissivity internal vapour barrier significantly reduces interstitial condensation and enhances thermal efficiency by reflecting up to 95% of radiant heat.\u003c\/p\u003e\n\u003c!----\u003e","brand":"Tyvek","offers":[{"title":"Default Title","offer_id":48662573875547,"sku":"48662573875547","price":163.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/tyvek-airguard-reflective_bf418352-c985-4f55-b45a-ad2377aba87b.jpg?v=1720782420"},{"product_id":"tyvek-airguard-reflective-e","title":"Tyvek Airguard Reflective E - 1.5m x 50m","description":"\u003cp\u003eThis robust, 100% airtight vapour barrier is specifically engineered to maximise thermal performance. Recommended for use with Tyvek® Reflex products, AirGuard® Reflective significantly enhances U-values in buildings. As a highly vapour and water-resistant, low emissivity internal vapour barrier, it effectively reduces interstitial condensation and boosts thermal efficiency by reflecting up to 95% of radiant heat.\u003c\/p\u003e\n\u003c!----\u003e","brand":"Tyvek","offers":[{"title":"Default Title","offer_id":48663901471067,"sku":"48663901471067","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/tyvek-airguard-reflective_e54f4040-614e-4a13-a215-16e21884a345.jpg?v=1721036384"},{"product_id":"tyvek-airguard-smart-1-5m-x-50m","title":"Tyvek Airguard Smart - 1.5m x 50m","description":"\u003cp\u003e\u003cspan\u003eTyvek® AirGuard® Smart safeguards against structural damage and the loss of insulation efficiency by intelligently adapting to diverse moisture conditions and regulating humidity within building components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Tyvek","offers":[{"title":"Default Title","offer_id":48679318389083,"sku":"48679318389083","price":177.2,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/TyvekAirguard.png?v=1721055411"},{"product_id":"proctor-wraptite-uv-50m-x-1-5m","title":"Proctor Wraptite UV Breather Membrane - 50m x 1.5m","description":"\u003cp\u003eWraptite UV is a Class B fire-rated membrane that offers a combination of exceptional vapour permeability and airtightness, tailored for use behind open-jointed cladding systems. This innovative, self-adhering product is designed to provide a “shadow” effect within open rainscreen façades, thanks to its superior water and UV resistance. Constructed from polyester with a functional coating, Wraptite UV features a proprietary acrylic moisture vapour permeable adhesive and a silicone-coated PET release liner for ease of application and durability.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48811535761755,"sku":"48811535761755","price":926.66,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/Wraptite_UV_facade_Roll-square.jpg?v=1723198208"},{"product_id":"proctor-procheck-500-0-5mm-x-2m-x-50m","title":"Proctor Procheck 500 - 0.5mm x 2m x 50m","description":"\u003cp\u003eProctor Procheck 500 is a strong reinforced polyethylene vapour control layer that offers excellent vapour resistance, making it a reliable choice for construction applications. The woven extruded polypropylene multifilament scrim reinforcement enhances nail tear resistance, ensuring durability. The translucent nature of the sheet allows for easier installation and inspection of support structures. This grade is widely used by leading system manufacturers for its dependable performance.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48842780279131,"sku":"48842780279131","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/procheck500.jpg?v=1723799606"},{"product_id":"proctor-procheck-300-0-3mm-x-2m-x-50m","title":"Proctor Procheck 300 - 0.3mm x 2m x 50m","description":"\u003cp\u003eProctor Procheck 300 is a strong reinforced polyethylene vapour control layer that offers excellent vapour resistance, making it a reliable choice for construction applications. The woven extruded polypropylene multifilament scrim reinforcement enhances nail tear resistance, ensuring durability. The translucent nature of the sheet allows for easier installation and inspection of support structures. This grade is widely used by leading system manufacturers for its dependable performance.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48843048386907,"sku":"48843048386907","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/procheck500.jpg?v=1723799606"},{"product_id":"proctor-procheck-125-0-35mm-x-2m-x-50m","title":"Proctor Procheck 125 - 0.35mm x 2m x 50m","description":"\u003cp\u003eProctor Procheck 125 is a strong reinforced polyethylene vapour control layer that offers excellent vapour resistance, making it a reliable choice for construction applications. The woven extruded polypropylene multifilament scrim reinforcement enhances nail tear resistance, ensuring durability. The translucent nature of the sheet allows for easier installation and inspection of support structures. This grade is widely used by leading system manufacturers for its dependable performance.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48843067916635,"sku":"48843067916635","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/procheck500.jpg?v=1723799606"},{"product_id":"proctor-probreathe-a2","title":"Proctor Probreathe A2 - 1.5m x 50m","description":"\u003cp\u003eProbreathe® A2 is an airtight, woven glass fibre membrane with a PU coating that offers a combination of breathability, water resistance, and airtightness. It holds a Reaction to Fire classification of A2-s1,d0, making it suitable for installation either free-hanging or on substrates with a minimum classification of A2-s1,d0.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48863359992155,"sku":"48863359992155","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/probreatheA2.jpg?v=1724059994"},{"product_id":"proctor-wraptite","title":"Proctor Wraptite - 1.5m x 50m","description":"\u003cp\u003eOur Wraptite external air barrier range offers a reliable solution for achieving airtightness in buildings. This robust system consists of two components: Wraptite and Wraptite Tape. This innovative approach not only ensures compliance with modern energy efficiency requirements for both commercial and residential buildings but also reduces labour and material costs associated with installation.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48877248348507,"sku":"48877248348507","price":752.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/Wraptite_roll-square.jpg?v=1724167598"},{"product_id":"novia-500g-avcl","title":"Novia 500G AVCL - 2.7m x 50m","description":"\u003cp\u003e\u003cspan style=\"font-size: 12.0pt; line-height: 115%; font-family: 'Aptos',sans-serif; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: Aptos; mso-fareast-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;\"\u003e\u003cstrong\u003eNovia® 500 Gauge VirginPoly\u003c\/strong\u003e is a virgin grade, single-ply polythene Air \u0026amp; Vapour Control Layer (AVCL) designed for use in insulated walls, roofs, and floors where there is a relatively low risk of interstitial condensation. Installed on the warm side of the building envelope, it minimises air leakage and moisture vapour penetration, helping to protect the structure and improve insulation performance.\u003cbr\u003e\u003cbr\u003eIdeal for timber frame constructions, including garden rooms and buildings, Novia® 500 Gauge VirginPoly is translucent green for ease of installation and is fully compliant with BS EN 13984 and CE marked. When used in conjunction with Novia® breather membranes and properly sealed with \u003ca title=\"Novia AVCL Tapes\" href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/novia-avcl-tapes\"\u003eNovia® AVCL tapes\u003c\/a\u003e, it supports energy-efficient, condensation-resistant construction.\u003c\/span\u003e\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":49037817610587,"sku":"49037817610587","price":77.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/Novia_500_Guage_VCL_Upright_-_small_542f22d5-00b8-4c47-ade2-24731318db51.jpg?v=1770726114"},{"product_id":"novia-1000g-avcl-2-7m-x-50m","title":"Novia 1000G AVCL - 4m x 25m","description":"\u003cp\u003e\u003cstrong data-start=\"206\" data-end=\"238\"\u003eNovia® 1000 Gauge VirginPoly\u003c\/strong\u003e is a virgin grade, single-ply polythene Air \u0026amp; Vapour Control Layer (AVCL) designed for use in insulated walls, roofs, and floors where there is a moderate risk of interstitial condensation. Installed on the warm side of the building envelope, it provides good resistance to moisture vapour and minimises air leakage, helping to protect structural timbers and improve long-term insulation performance. \u003cbr\u003e\u003cbr\u003eIdeal for timber frame constructions, including garden rooms and buildings, Novia® 1000 Gauge VirginPoly is supplied multi-folded in wide 4m rolls and is translucent green for ease of installation to the framework. Fully compliant with BS EN 13984 and CE marked, it should be used in conjunction with Novia® breather membranes on the cold side and correctly sealed with \u003ca title=\"Novia AVCL Tapes\" href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/novia-avcl-tapes\"\u003eNovia® AVCL tapes\u003c\/a\u003e for optimal air-tightness and energy-efficient construction.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":49037953696091,"sku":"49037953696091","price":123.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/Novia_1000_Guage_VCL_Upright2_-_small_0571b821-3d2d-41e2-9b61-68eebb8a37d0.jpg?v=1770726281"},{"product_id":"novia-1200g-avcl","title":"Novia 1200G AVCL - 4m x 25m","description":"\u003cp\u003e\u003cstrong data-end=\"163\" data-start=\"131\"\u003eNovia® 1200 Gauge VirginPoly\u003c\/strong\u003e is a virgin grade, single-ply polythene Air \u0026amp; Vapour Control Layer (AVCL) designed for use in insulated walls, roofs, and floors where there is a moderate to high risk of interstitial condensation. Installed on the warm side of the building envelope, it provides very good resistance to moisture vapour and minimises air leakage, protecting structural timbers and improving long-term insulation performance. \u003cbr\u003e\u003cbr\u003eSuitable for timber frame constructions, including garden rooms and buildings, Novia® 1200 Gauge VirginPoly is supplied multi-folded in wide 4m rolls and is translucent green for ease of installation to the framework. Fully compliant with BS EN 13984 and CE marked, it should be used alongside Novia® breather membranes on the cold side and correctly sealed with \u003ca title=\"Novia AVCL Tapes\" href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/novia-avcl-tapes\"\u003eNovia® AVCL tapes\u003c\/a\u003e for optimal air-tightness and energy-efficient construction.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":49038031716699,"sku":"49038031716699","price":140.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/Novia_1200_Guage_VCL_Upright_1_-_small_463e092d-dcef-4f07-ba7d-783325ffbcbe.jpg?v=1770726354"},{"product_id":"novia-strp-promax-avcl","title":"Novia STRP ProMax AVCL - 1.6m x 50m","description":"\u003cp\u003eNovia® STRP ProMax is a premium-grade, reinforced, foil-laminated polythene membrane designed for use as an internal Air \u0026amp; Vapour Control Layer (AVCL). Compliant with BS EN 13984 and UKCA marked, it offers outstanding moisture vapour resistance—ideal for insulated \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/wall-insulation\" title=\"wall insulation\"\u003ewall\u003c\/a\u003e, \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/floor-insulation\" title=\"floor insulation\"\u003efloor\u003c\/a\u003e, and \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/roof-insulation\" title=\"roof insulation\"\u003eroof\u003c\/a\u003e applications where there is a high risk of interstitial condensation.\u003c\/p\u003e\n\u003cp\u003eEngineered to reduce air leakage and minimise heat loss, Novia® STRP ProMax enhances long-term energy efficiency. It is especially well-suited to metal profile clad industrial buildings and commercial properties but can also be used in all types of insulated construction, including flat roofs (internal use only). When installed with a 25mm air gap, the reflective surface provides additional thermal performance. The membrane is reflective on one side and blue on the reverse, with no printed text or images.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":50836799619419,"sku":"50836799619419","price":225.01,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/STRPProMax.jpg?v=1750341759"},{"product_id":"novia-strp-reinforced-avcl","title":"Novia STRP Reinforced AVCL - 2m x 50m","description":"\u003cp\u003eNovia STRP VCL is a high-specification, reinforced polythene laminate designed for use as a Vapour Control Layer (VCL). It is ideal for metal profile clad industrial buildings, educational facilities, commercial properties, and high-specification residential timber frame constructions. Suitable for applications where effective control of water vapour transmission is essential, Novia STRP VCL helps protect insulation and building structures from condensation and moisture-related issues.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":50836872495451,"sku":"50836872495451","price":195.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/STRP.jpg?v=1750342386"},{"product_id":"novia-strp-light-reinforced-polythene-avcl","title":"Novia STRP Light Reinforced Polythene AVCL","description":"\u003cp\u003eNovia® STRP Light is a high specification, strong, reinforced polythene laminate Air \u0026amp; Vapour\u003cbr\u003eControl Layer (AVCL). The material meets EN 13984 and is CE marked. Novia® STRP Light\u003cbr\u003ehas good moisture vapour resistance and is suitable for use in insulated wall, floor or roof\u003cbr\u003eapplications, where there is a moderate risk of interstitial condensation occurring. Novia®\u003cbr\u003eSTRP Light also minimises air leakage and energy heat losses, improving the long-term\u003cbr\u003eenergy efficiency of constructions. The membrane is a high specification polythene solution,\u003cbr\u003eand is particularly suitable for use in low-rise metal profile clad industrial buildings and other\u003cbr\u003ecommercial properties. Novia® STRP Light is translucent, with no text or images, which allows\u003cbr\u003efor ease of installation to the structural framework.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":54331809988955,"sku":"54331809988955","price":165.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/01_STRP_Roll_V001.png?v=1791795697"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/collections\/tyvek-airguard-reflective_e54f4040-614e-4a13-a215-16e21884a345.jpg?v=1792669753","url":"https:\/\/www.nationalinsulationsupplies.com\/collections\/airtight-membranes.oembed","provider":"National Insulation Supplies","version":"1.0","type":"link"}