{"title":"Vapour Control Layers (VCLs)","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eVapour control layers (VCLs) help reduce the movement of moisture vapour from inside a building into walls, roofs and ceilings, where condensation can develop within the construction. Choosing the right VCL depends on the building design, required vapour resistance and whether additional airtightness, reflective or fire-performance properties are needed.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOur range includes \u003c\/span\u003evapour control layers from Novia, Tyvek, A. Proctor Group and ITP\u003cspan\u003e, covering different construction requirements. Options include \u003c\/span\u003epolythene VCLs for general vapour control, reinforced membranes for applications requiring greater durability, reflective VCLs for compatible construction systems and fire-rated VCLs where specific fire-performance requirements apply.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eVCLs are generally installed on the warm side of the insulation, with joints, overlaps and penetrations sealed using compatible tapes and accessories to maintain the intended air and vapour control performance.\u003c\/span\u003e\u003c\/p\u003e","products":[{"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":"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-procheck-fr200-1-6m-x-50m","title":"Proctor Procheck FR200 - 1.6m x 50m","description":"\u003cp\u003eProcheck FR200 is a reliable vapour control layer designed for use in roof and wall structures for both new builds and renovation projects. With a Reaction to Fire classification of B-s1,d0, it offers enhanced fire performance, ensuring safety and compliance with building standards. This air and vapour-tight membrane not only improves energy efficiency by minimising heat loss but also reduces the risk of condensation, contributing to a healthier and more durable building structure.\u003c\/p\u003e\n\u003c!----\u003e","brand":"A Proctor Group","offers":[{"title":"Default Title","offer_id":48865156727131,"sku":"48865156727131","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/procheckfr200.jpg?v=1724077042"},{"product_id":"novia-vc2-avcl","title":"Novia VC2 AVCL - 1.5m x 50m","description":"\u003cp\u003eNovia VC2 AVCL (air and vapour control layer) is an advanced, reinforced membrane designed to provide effective air-tightness and vapour control in insulated \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/wall-insulation\" title=\"wall insulation\"\u003ewall\u003c\/a\u003e, \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/roof-insulation\" title=\"roof insulation\"\u003eroof\u003c\/a\u003e, and \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/floor-insulation\" title=\"floor insulation\"\u003efloor\u003c\/a\u003e applications within timber-framed buildings.\u003c\/p\u003e\n\u003cp\u003eThis membrane acts as an air-leakage barrier, preventing losses due to unwanted convection flows. For ensuring complete barrier integrity throughout the product's lifespan, we recommend using Novia double-sided butyl tape, metallised BOPP tape, or aluminium foil tape. For challenging sealing areas or additional support, Novia AirSeal 310 can be utilised. Novia VC2 AVCL should be paired with Novia breather membranes to create a comprehensive air-tight and vapour-resistant system.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":49037071581531,"sku":"49037071581531","price":85.57,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/VC2_-_small_457bcf96-bdd2-4fa6-ae04-b62a585771e3.jpg?v=1770729996"},{"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-vc200-reflective-avcl","title":"Novia VC200 Reflective AVCL - All Sizes","description":"\u003cp\u003eNovia® VC200 Reflective is a high-performance Air \u0026amp; Vapour Control Layer (AVCL) designed for applications requiring excellent moisture vapour resistance. Compliant with BS EN 13984 and UKCA approved, this material is suitable for use in insulated \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/wall-insulation\" title=\"wall insulation\"\u003ewalls\u003c\/a\u003e, \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/floor-insulation\" title=\"floor insulation\"\u003efloors\u003c\/a\u003e, and \u003ca href=\"https:\/\/www.nationalinsulationsupplies.com\/collections\/roof-insulation\" title=\"roof insulation\"\u003eroofs\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eWith a reflectivity of 98%, Novia® VC200 enhances both U and R values, potentially adding up to 0.74m²K\/W* to the R value when properly installed. It features low moisture vapour permeability, ensuring effective control of moisture. Novia® VC200 also meets EN 13501-1 Fire Classification Class E.\u003c\/p\u003e\n\u003cp\u003eAvailable in roll sizes of 1.5m x 50m or 2.7m x 100m, the product is reflective on one side and white on the reverse, with no text or images.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"1.5m x 50m = 1 roll","offer_id":49038231142747,"sku":"49038231142747","price":87.15,"currency_code":"GBP","in_stock":true},{"title":"2.7m x 100m = 1 roll","offer_id":49038231175515,"sku":"49038231175515","price":304.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/VC200reflective.jpg?v=1726656456"},{"product_id":"novia-vc4000-fr-reflective-avcl","title":"Novia VC4000 FR Reflective AVCL - 1.5m x 50m","description":"\u003cp\u003eNovia® VC4000 FR Reflective is a high-quality, high-performance Air \u0026amp; Vapour Control Layer (AVCL) with Class B* flame resistance. It meets BS EN 13984 standards and is UKCA approved. Complying with EN 13501-1 Fire Classification Class B-s1, d0*, it is suitable for use in high-rise applications. Novia® VC4000 FR offers excellent moisture vapour resistance, making it ideal for insulated wall or roof applications requiring high moisture control. With a reflectivity of 98%, it significantly enhances both U and R values when installed correctly. This product provides a very low moisture vapour permeability solution due to its high-performance materials. It features a reflective surface on one side and a white surface on the reverse, with no text or images.\u003c\/p\u003e","brand":"Novia","offers":[{"title":"Default Title","offer_id":49039457091931,"sku":"49039457091931","price":199.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/NoviaVC4000VCLRollLogoLR.jpg?v=1726665374"},{"product_id":"itp-flameout-block-class-a-vapour-control-layer-1-5m-x-50m","title":"ITP FlameOut Block Class A Vapour Control Layer - 1.5m x 50m","description":"\u003cp\u003eThe FlameOut Block Class A vapour control layer is a glass-based woven scrim combined with an aluminium layer, featuring a protective coating to prevent corrosion of the aluminium. The glass reinforcement scrim offers excellent tensile strength for use in wall and roof insulation. This advanced vapour control layer has been independently tested to meet British and international flame retardant standards, achieving the Euroclass A2-s1,d0 fire safety classification, aligning with the fire safety requirements of other external wall elements such as cladding.\u003c\/p\u003e","brand":"ITP","offers":[{"title":"Default Title","offer_id":49244786590043,"sku":"49244786590043","price":346.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/flameoutblockclassA2.jpg?v=1729072393"},{"product_id":"itp-flameout-block-fr-vapour-control-layer-2m-x-50m","title":"ITP FlameOut Block FR Vapour Control Layer - 2m x 50m","description":"\u003cp\u003eFlameOut Block FR is a polyethylene-based vapour control layer reinforced with a mono-filament scrim, providing excellent tensile strength for wall and roof insulation applications. These vapour control layers have been independently tested to meet British and international flame retardant standards, ensuring reliable fire safety performance.\u003c\/p\u003e","brand":"ITP","offers":[{"title":"Default Title","offer_id":49245003317595,"sku":"49245003317595","price":157.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7763\/0299\/files\/flameoutblock.jpg?v=1729074425"},{"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\/VC2airandvapour.jpg?v=1793630833","url":"https:\/\/www.nationalinsulationsupplies.com\/collections\/vapour-control-layers.oembed","provider":"National Insulation Supplies","version":"1.0","type":"link"}