{"title":"Gas Resistant Membranes","description":"\u003cp\u003eA gas membrane is a low-permeability barrier installed within a building's structure to prevent harmful ground gases from migrating into occupied spaces. In construction, the term covers a range of products installed beneath or around below-ground structures: sheet membranes laid under concrete floor slabs, self-adhesive membranes bonded to vertical concrete walls and pile caps, pre-applied membranes positioned ahead of the concrete pour, and liquid applied coatings used to seal complex details, corners and service penetrations. All share the same core function: creating a continuous, gas-tight layer between the ground and the building interior.\u003c\/p\u003e\n\u003cp\u003eGas resistant membranes go a step further than standard radon barriers. Where a standard radon barrier is engineered primarily for ground floor slab installation on greenfield or low-risk sites, a gas resistant membrane is a structural product capable of simultaneously resisting hydrostatic water pressure and providing a certified barrier against ground gas ingress. This makes them the correct specification where a building is below ground level and exposed to both water and gas risk.\u003c\/p\u003e\n\u003ch2\u003eWhen is a gas resistant membrane required?\u003c\/h2\u003e\n\u003cp\u003eGround gas is a concern wherever the soil beneath a site contains materials capable of producing, or has been exposed to, hazardous gas concentrations. Methane and carbon dioxide are generated by the decomposition of organic material and are a particular risk on brownfield land, former landfill sites and areas of made ground. Radon is a naturally occurring radioactive gas present at varying levels across the UK, arising from the decay of uranium in rocks and soils. Volatile organic compounds and hydrocarbons are associated with former industrial sites and petrol stations. Any combination of these gases may be present on a single site, which is why the gas protection system must be designed to the specific conditions identified in the ground investigation.\u003c\/p\u003e\n\u003ch3\u003eContaminated land and brownfield sites\u003c\/h3\u003e\n\u003cp\u003eThe redevelopment of brownfield land is a significant and growing part of the UK's construction programme. Former industrial, landfill and made-ground sites frequently carry elevated concentrations of methane, carbon dioxide and VOCs, and the level of gas protection required is directly proportional to the risk characterisation for that site. Where ground investigation data indicates a gas hazard, a gas protection system designed in accordance with current guidance is required before any below-ground structure or occupied ground floor slab can be constructed.\u003c\/p\u003e\n\u003ch3\u003eBuilding regulations and design standards\u003c\/h3\u003e\n\u003cp\u003eGround gas protection for new buildings is governed by BS 8485:2015+A1:2019, the code of practice for the design of protective measures against methane and carbon dioxide ground gases. This standard provides the framework for site characterisation, risk assessment and the selection of appropriate gas protection measures, and requires installation to be verified by a competent person. Where a below-ground structure also requires waterproofing, BS 8102:2022 applies, governing the design and construction of waterproofing systems for basements and earth-retained structures. Gas resistant membranes that carry dual compliance with both standards are the appropriate solution wherever these requirements overlap.\u003c\/p\u003e\n\u003ch2\u003eGas resistant membrane types\u003c\/h2\u003e\n\u003cp\u003eThe range of gas resistant membranes reflects the variety of structural situations and gas risk profiles encountered on site. Selecting the right format requires an understanding of the floor construction type, the level of gas hazard, the presence of hydrostatic pressure, and the detailing requirements for the specific installation.\u003c\/p\u003e\n\u003ch3\u003eSheet and self-adhesive gas membranes\u003c\/h3\u003e\n\u003cp\u003eSheet membranes are the most widely used format for horizontal applications below concrete ground floor slabs. They are manufactured from polymer film, often incorporating an aluminium foil layer which significantly reduces gas permeability, and are available at a range of thicknesses to suit the gas hazard classification of the site. Products within this range also function as a damp proof membrane, removing the need for a separate DPM layer in the floor build-up.\u003c\/p\u003e\n\u003cp\u003eSelf-adhesive gas membranes are used where the membrane needs to bond to a substrate rather than simply being laid flat. This makes them the standard choice for vertical applications on concrete retaining walls, basement walls, pile caps, lift pits and stepped foundations, and in locations where the sheet cannot be loose-laid. The self-adhesive construction creates a direct bond to the concrete face, reducing the risk of gas tracking beneath the membrane at joints and edges. Pre-applied membranes, applied to blinding or formwork before the concrete is poured, form a fully bonded system once the slab is cast, which is particularly effective in ensuring continuity at wall-to-floor junctions.\u003c\/p\u003e\n\u003cp\u003eFor VOC-contaminated sites and those where a wider range of chemical contaminants is present, specialist multi-layer gas membranes with enhanced chemical resistance are available, providing protection against hydrocarbons and other compounds beyond the scope of standard gas barriers.\u003c\/p\u003e\n\u003ch3\u003eLiquid applied gas membranes\u003c\/h3\u003e\n\u003cp\u003eLiquid applied gas membranes are brush, roller or spray-applied coatings that cure to form a seamless, flexible gas and waterproof barrier. Their primary strength is in complex detailing: service penetrations, pipe entries, awkward corners, junctions between different construction types and retrofit situations where a sheet membrane cannot be accommodated. They bond to porous and non-porous substrates and can be used in both horizontal and vertical applications. In a complete system they are frequently used alongside sheet or self-adhesive membranes, applied as a first-stage treatment to details and transitions before the main sheet membrane is laid, ensuring continuity across the most vulnerable points in the installation.\u003c\/p\u003e\n\u003ch2\u003eGas resistant membranes and waterproofing\u003c\/h2\u003e\n\u003cp\u003eOne of the key distinctions between a gas resistant membrane and a standard radon barrier is the capacity to resist hydrostatic pressure. A standard radon barrier is not designed for use where the membrane will be subject to water pressure from the surrounding ground; in that situation it will not perform as a waterproofing layer and a structural waterproofing solution is required.\u003c\/p\u003e\n\u003cp\u003eGas resistant membranes in this range, including structural self-adhesive and pre-applied options, are designed to provide Type A waterproofing protection in accordance with BS 8102:2022, working in conjunction with or as part of a structural waterproofing system for below-ground applications. This means that on sites where both ground gas and groundwater are present, a single correctly specified gas resistant membrane can address both risks within one system, subject to the specific requirements of the site and the design.\u003c\/p\u003e\n\u003cp\u003eFor projects where the primary requirement is waterproofing against significant hydrostatic pressure and ground gas resistance is a secondary consideration, see our Tanking Slurry and Membranes range. Note that products in this range and in that collection serve different primary functions; any specification combining gas resistance and waterproofing should be confirmed against the relevant technical datasheets and current standards.\u003c\/p\u003e\n\u003ch2\u003eInstalling gas resistant membranes\u003c\/h2\u003e\n\u003cp\u003eGas membrane installation is a detail-critical activity. The membrane itself provides the protection, but a continuous, correctly lapped and properly sealed system is required for it to perform. Any breach, unsupported joint or unsealed service penetration represents a potential gas ingress point. For this reason, ground gas protection systems must be installed by a competent contractor and the installation should be subject to inspection and verification by an independent specialist in accordance with BS 8485:2015+A1:2019.\u003c\/p\u003e\n\u003cp\u003eSheet membranes are typically laid onto a prepared blinding layer beneath the reinforced concrete slab, with laps formed to overlap in the direction of the pour. Lap joints must be sealed using the manufacturer's specified tape or detailing strip to maintain continuity. Pre-applied membranes are installed onto the substrate before the concrete is placed, with the membrane bond activated by contact with the fresh concrete. Self-adhesive membranes are applied to a clean, primed substrate; primer is typically required for vertical or sloping surfaces to ensure full adhesion, and the substrate should be free from contamination, dust and standing water at the time of application.\u003c\/p\u003e\n\u003cp\u003ePenetrations for services, drainage pipes and structural elements passing through the membrane are among the most critical details in any gas membrane installation. Liquid applied membrane products are used to seal around penetrations and at wall-to-floor junctions, providing a flexible, fully bonded detail that a sheet membrane alone cannot achieve. Gas membrane tape provides additional security at laps where required by the specification. All details should be carried out in strict accordance with the manufacturer's installation guidance and the design drawings for the project.\u003c\/p\u003e\n\u003ch2\u003eChoosing the right gas membrane\u003c\/h2\u003e\n\u003cp\u003eThe correct gas membrane for a project is determined by the site risk, the construction type and the regulatory requirements that apply, not by product preference. A gas risk assessment carried out as part of the site investigation will characterise the type and level of gas hazard, and from that characterisation the appropriate level of protection can be selected. Where radon is the only gas of concern and no below-ground waterproofing is required, a standard radon barrier from our Radon Barriers and Gas Membranes range may be the more appropriate product. Where methane, CO2 or VOCs are present, or where the structure is below ground level and exposed to water pressure, a gas resistant membrane from this range is the correct starting point.\u003c\/p\u003e\n\u003cp\u003eFormat selection follows from construction type: sheet membranes for standard below-slab horizontal applications; self-adhesive and pre-applied for structural vertical and composite applications; liquid applied for detailing.\u003c\/p\u003e\n\u003ch2\u003eWhy choose Construction Supplies UK for gas resistant membranes\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eSpecialist range for structural gas protection:\u003c\/strong\u003e Our gas resistant membranes are selected for below-ground and earth-retained applications where both waterproofing and gas resistance are required, with products rated to BS 8102:2022 and BS 8485:2015+A1:2019.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTrusted brands across all formats:\u003c\/strong\u003e We stock gas resistant membrane products from Visqueen, RIW, ITP and Principal Building Products, covering sheet, self-adhesive, pre-applied and liquid applied formats for the full range of structural gas protection applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFree delivery on orders over £300 ex VAT:\u003c\/strong\u003e With no minimum order value, we supply trade and retail customers across mainland UK, making it straightforward to order the right quantity for your project.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical product information:\u003c\/strong\u003e Full technical datasheets, compliance certifications and installation guidance are available for all products. If you need help matching a product to a specification or ground gas report, the team is available to assist.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDirect supply:\u003c\/strong\u003e Order online or contact us directly at \u003cstrong\u003e\u003ca href=\"sales@constgructionsuppliesuk.co.uk\"\u003esales@constructionsuppliesuk.co.uk\u003c\/a\u003e\u003c\/strong\u003e or \u003cstrong\u003e03300 55 32 02.\u003c\/strong\u003e We supply groundworkers, waterproofing contractors, groundwork engineers and main contractors direct, without the delays of a distributor in the middle.\u003c\/p\u003e","products":[{"product_id":"riw-gr-sheetseal","title":"RIW GR Sheetseal","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRIW Sheetseal GR is a cold-applied sheet membrane combining a high density polyethylene film bonded to aluminium foil with a bitumen\/rubber self-adhesive layer and a removable reinforced silicone release paper. This multi-layer construction delivers both a robust waterproof membrane and a tested barrier against methane and carbon dioxide gas — making it the product of choice where ground gas is a concern alongside water ingress.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe product has been independently tested by Wimpey Laboratories for methane gas resistance, with results documented in the product data sheet. When correctly applied, Sheetseal GR provides Type A (barrier) protection capable of meeting the requirements for Grade 1, 2 and 3 basements as classified in BS8102:2009.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eFactory controlled thickness ensures consistent performance\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSelvedge strip to improve lap sealing\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eElastic and flexible\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWater and water vapour barrier\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eMethane and carbon dioxide barrier\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSelf healing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSubject to normal conditions of use Sheetseal GR will provide an effective barrier to methane gas, water and water vapour for the life of the structure\u003c\/li\u003e\n\u003cli\u003eNo drying time\u003c\/li\u003e\n\u003cli\u003eSulphate resistant\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127693451596,"sku":"BM05733","price":497.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-gr-sheetseal-1232467508.jpg?v=1776259230"},{"product_id":"newton-hydrobond-sagm-external-waterproofing-gas-membrane","title":"Newton HydroBond SAGM External Waterproofing \u0026 Gas Membrane","description":"\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"markdown markdown-main-panel stronger enable-updated-hr-color\" id=\"model-response-message-contentr_935ab606bcd817b7\" aria-live=\"polite\" aria-busy=\"false\" dir=\"ltr\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eNewton HydroBond SAGM is a high-performance, self-adhesive \"Type A\" membrane specifically designed to provide both external waterproofing and robust gas proofing for below-ground structures. This versatile sheet membrane is a composite of cross-oriented HDPE film and a thick bitumen-polymer adhesive, engineered for post-application to concrete, blockwork, or Insulated Concrete Formwork (ICF) walls. In addition to preventing water ingress, the SAGM version provides a certified barrier against harmful ground gases, including Radon, Methane, and Carbon Dioxide. Its advanced adhesive formula ensures a high-strength, fully-bonded seal even in temperatures as low as 5°C, effectively eliminating the risk of water or gas tracking between the membrane and the structure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-path-to-node=\"3,0,0\"\u003eDual-action protection provides a reliable barrier against both groundwater and hazardous ground gases\u003c\/li\u003e\n\u003cli data-path-to-node=\"3,1,0\"\u003eFully-bonded system prevents water or gas migration behind the membrane in the case of a puncture\u003c\/li\u003e\n\u003cli data-path-to-node=\"3,2,0\"\u003eHigh flexibility and elongation allow the membrane to bridge minor cracks and settlement in the structure\u003c\/li\u003e\n\u003cli data-path-to-node=\"3,3,0\"\u003eCold-applied and self-adhesive for a safe, fast installation without the need for specialist heat equipment\u003c\/li\u003e\n\u003cli data-path-to-node=\"3,4,0\"\u003eAdvanced adhesive achieves a high-strength bond at temperatures as low as 5°C for year-round application\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-path-to-node=\"5,0,0\"\u003eSupplied in 1.00m x 20.00m rolls providing 20 square metres of coverage\u003c\/li\u003e\n\u003cli data-path-to-node=\"5,1,0\"\u003eProduct code 401-GM\u003c\/li\u003e\n\u003cli data-path-to-node=\"5,2,0\"\u003eSubstrates must be prepared with Newton HydroBond SA Primer LT to ensure maximum adhesion\u003c\/li\u003e\n\u003cli data-path-to-node=\"5,3,0\"\u003eCompatible with HydroBond SAGM Detail Strip for reinforcing wall-to-foundation joints and corners\u003c\/li\u003e\n\u003cli data-path-to-node=\"5,4,0\"\u003eHighly resistant to aggressive groundwater chemicals and soil contaminants\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Newton Waterproofing","offers":[{"title":"Default Title","offer_id":57211599716684,"sku":"BM06078","price":296.44,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/newton-waterproofing-newton-hydrobond-sagm-external-waterproofing-gas-membrane-1232467334.jpg?v=1776255674"},{"product_id":"visqueen-gas-barrier-2m-x-50m-100m2","title":"Visqueen Gas Barrier","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eVisqueen Gas Barrier is a multi-layer reinforced polyethylene gas barrier membrane incorporating a 20 micron aluminium foil core, providing highly effective protection against methane, carbon dioxide, radon and other ground gases. The membrane is blue on the upper surface and silver on the reverse, and is supplied in single wound (not folded) rolls measuring 2m x 50m.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe membrane complies with the methane gas transmission rate, mass per unit area and thickness requirements of BS 8485:2015+A1:2019 for methane and carbon dioxide protection, and with NHBC Foundation's NF94 guidelines for use in Type A membrane locations. It also provides radon and damp proof membrane protection.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eMulti-layer reinforced polyethylene gas barrier with 20 micron aluminium foil\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eMethane and CO2 protection to BS 8485:2015+A1:2019\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAlso provides radon and damp proof membrane protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eBBA Agrement certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThis product \u003cspan style=\"text-decoration: underline;\"\u003emust not\u003c\/span\u003e come into direct contact with uncured concrete or screed due to the aluminium foil core.\u003c\/li\u003e\n\u003cli\u003eLap joints can be taped or heat welded\u003c\/li\u003e\n\u003cli\u003eVisqueen Gas Barrier should be installed on a smooth continuous surface e.g. grouted beam and block floor, a compacted blinding layer e.g. 50mm thick sand blinding, or smooth concrete blinding.\u003c\/li\u003e\n\u003cli\u003eWhen installing the barrier in demanding site conditions, or where specified, use Visqueen NF-150 Lap Tape (in conjunction with the double sided tape) to seal the lap.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Visqueen","offers":[{"title":"Default Title","offer_id":57301784789324,"sku":"BMD10882","price":417.71,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-membranes-visqueen-gas-barrier-2m-x-50m-roll-100m2-1233883878.jpg?v=1776866090"},{"product_id":"visqueen-gas-barrier-nf-400-2-4m-x-43-5m-x-400-micron","title":"Visqueen Gas Barrier NF-400","description":"\u003cp\u003eVisqueen Gas Barrier NF-400 is a co-extruded, multi-layer thermoplastic gas membrane 0.4mm thick (400 micron). The membrane is transparent with a blue tint, allowing a clear view of the substrate during and after installation. Supplied in single wound rolls measuring 2.4m x 43.5m. Provides a multi-functional ground gas and moisture protection in a single product.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMethane and CO2 protection to BS 8485:2015+A1:2019\u003c\/li\u003e\n\u003cli\u003eNHBC Foundation NF94 compliant — Type A membrane location\u003c\/li\u003e\n\u003cli\u003eAlso acts as radon and damp proof membrane\u003c\/li\u003e\n\u003cli\u003eBBA Agrement certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTransparent with blue tint for substrate visibility\u003c\/li\u003e\n\u003cli\u003eLap joints can be taped or heat welded\u003c\/li\u003e\n\u003cli\u003eVisqueen Gas Barrier NF-400 should be installed on a smooth continuous surface e.g. grouted beam and block floor, a compacted blinding layer e.g. 50mm thick sand blinding, or smooth concrete blinding. The substrate should\u003cbr\u003ebe free from irregularities such as loose aggregates or other sharp protrusions, voids, projections or mortar deposits.\u003c\/li\u003e\n\u003cli\u003eStore in a cool dry place away from direct sunlight\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Visqueen","offers":[{"title":"Default Title","offer_id":57301786100044,"sku":"BM02419","price":466.85,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-gas-barrier-nf-400-1233883885.jpg?v=1776865830"},{"product_id":"visqueen-gas-barrier-nf-500-2-4m-x-43-5m-x-500-micron","title":"Visqueen Gas Barrier NF-500","description":"\u003cp\u003eVisqueen Ultimate Gas Barrier NF-500 is a co-extruded, multi-layer thermoplastic VOC and gas barrier membrane 0.5mm thick (500 micron). The membrane is transparent with a green tint, distinguishing it from the NF-400 (blue tint), and is supplied in single wound rolls measuring 2.4m x 43.5m.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMethane and CO2 protection to BS 8485:2015+A1:2019\u003c\/li\u003e\n\u003cli\u003eVOC protection to CIRIA C748:2014\u003c\/li\u003e\n\u003cli\u003eNHBC Foundation NF94 compliant — Type A and Type B membrane locations\u003c\/li\u003e\n\u003cli\u003eAlso acts as radon and damp proof membrane\u003c\/li\u003e\n\u003cli\u003eBBA Agrement certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTransparent with green tint\u003c\/li\u003e\n\u003cli\u003eStore in cool dry place away from direct sunlight \u003c\/li\u003e\n\u003cli\u003eLap joints can be taped or heat welded\u003c\/li\u003e\n\u003cli\u003eThe barrier can be positioned above or below reinforced cast in situ concrete floor slabs e.g. ground bearing, suspended or raft, or above precast suspended segmental subfloors, e.g. beam and block floor.\u003c\/li\u003e\n\u003cli\u003eVisqueen Ultimate Gas Barrier NF-500 should be installed on a smooth continuous surface e.g. grouted beam and block floor, a compacted blinding layer e.g. 50mm thick sand blinding, or smooth concrete blinding. The substrate should be free from irregularities such as loose aggregates or other sharp protrusions, voids, projections or mortar deposits\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Visqueen","offers":[{"title":"Default Title","offer_id":57301786132812,"sku":"BM02420","price":828.57,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-gas-barrier-nf-500-1233883884.jpg?v=1776865848"},{"product_id":"visqueen-ulitmate-gas-dpc-900mm-x-20m","title":"Visqueen Ulitmate Gas DPC","description":"\u003cp\u003eVisqueen Ultimate Gas DPC is a 0.5mm thick flexible 7-layer co-extruded film providing VOC and ground gas resistance for use as a damp proof course and cavity tray in masonry construction on sites where gas protection is required. The DPC has an embossed\/debossed finish, is coloured gold\/white and can be installed with either surface facing upwards. It is ideal for sites where multiple gas hazards are present.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBS 8485:2015+A1:2019 methane and CO2 compliant\u003c\/li\u003e\n\u003cli\u003eProtection against radon, carbon dioxide, methane and VOCs\u003c\/li\u003e\n\u003cli\u003eCIRIA C748:2014 VOC compliant\u003c\/li\u003e\n\u003cli\u003eSupplied in 20m rolls in 500mm, 600mm, 750mm and 900mm widths\u003c\/li\u003e\n\u003cli\u003e7 layers to make 0.5mm thickness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCan be installed with either surface facing upwards\u003c\/li\u003e\n\u003cli\u003eLap joints can be taped or heat welded\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Visqueen","offers":[{"title":"500mm","offer_id":57345869840716,"sku":"BM009676","price":160.9,"currency_code":"GBP","in_stock":true},{"title":"600mm","offer_id":57345869873484,"sku":"BM02424","price":193.09,"currency_code":"GBP","in_stock":true},{"title":"750mm","offer_id":57345869906252,"sku":"BM02425","price":241.36,"currency_code":"GBP","in_stock":true},{"title":"900mm","offer_id":57345869939020,"sku":"BM02426","price":289.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-ulitmate-gas-dpc-1233883886.jpg?v=1776865710"},{"product_id":"visqueen-gr-self-adhesive-membrane-1m-x-20m","title":"Visqueen Gas Resistant Self Adhesive Membrane","description":"\u003cp\u003eVisqueen Gas Resistant Self Adhesive Membrane is a foil lined modified bitumen rubber membrane with a self-adhesive coating protected by a removable polyethylene release film. The upper surface is silver and the membrane is supplied in rolls of 1m x 20m.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType A waterproofing to BS 8102:2022\u003c\/li\u003e\n\u003cli\u003eMethane and CO2 protection to BS 8485:2015+A1:2019\u003c\/li\u003e\n\u003cli\u003eAlso provides radon and DPM protection\u003c\/li\u003e\n\u003cli\u003eBBA Agrement certified\u003c\/li\u003e\n\u003cli\u003eA multi-functional solution for sites where both waterproofing and gas protection are required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSilver upper surface\u003c\/li\u003e\n\u003cli\u003eSelf adhesive - no need for jointing tape\u003c\/li\u003e\n\u003cli\u003eEPD available\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Visqueen","offers":[{"title":"Default Title","offer_id":57301787017548,"sku":"BM008772","price":332.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-gas-resistant-self-adhesive-membrane-1233883891.jpg?v=1776865693"},{"product_id":"visqueen-liquid-gas-membrane-12-5l","title":"Visqueen Liquid Gas Membrane","description":"\u003cp\u003eVisqueen Liquid Gas Membrane is a blue-grey single component polymer modified emulsion that dries to form a black flexible membrane providing damp proof, gas proof and waterproof protection. Unlike sheet membranes, the liquid applied system creates a seamless, fully bonded barrier with no lap joints, and is self-terminating at the perimeter of the installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType A waterproofing to BS 8102:2022\u003c\/li\u003e\n\u003cli\u003eMethane and CO2 protection to BS 8485:2015+A1:2019\u003c\/li\u003e\n\u003cli\u003eRadon protection to BR 211:2023\u003c\/li\u003e\n\u003cli\u003eSeamless fully bonded application — no lap joints\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for damp surfaces and green concrete\u003c\/li\u003e\n\u003cli\u003eApplied by brush or roller as a single component system — no mixing required.\u003c\/li\u003e\n\u003cli\u003ePaint on blue - dries in black to ensure you have covered all areas\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Visqueen","offers":[{"title":"Default Title","offer_id":57301787181388,"sku":"BM02427","price":291.04,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-liquid-gas-membrane-1233883895.jpg?v=1776865669"},{"product_id":"visqueen-ultimate-geoseal-2-44m-x-20-5m-x-1mm","title":"Visqueen Ultimate Geoseal","description":"\u003cp\u003eVisqueen Ultimate GeoSeal is a robust 1mm thick pre-applied waterproofing barrier membrane for below-ground reinforced concrete structures. The membrane is grey on the upper surface, with a textured finish to aid adhesion to cast in-situ concrete, and black on the reverse. Supplied in single wound rolls measuring 2.44m x 20.5m.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType A waterproofing to BS 8102:2022, resistant to groundwater\u003c\/li\u003e\n\u003cli\u003eMethane and CO2 protection to BS 8485:2015+A1:2019\u003c\/li\u003e\n\u003cli\u003eVOC protection to CIRIA C748:2014\u003c\/li\u003e\n\u003cli\u003eAlso provides radon and DPM protection\u003c\/li\u003e\n\u003cli\u003eNHBC NF94 compliant\u003c\/li\u003e\n\u003cli\u003eBBA Agrement certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTextured grey upper surface aids adhesion to cast concrete\u003c\/li\u003e\n\u003cli\u003eLap joints can be taped or heat welded\u003c\/li\u003e\n\u003cli\u003eSupplied as single wound rolls 2.44m x 20.5m\u003c\/li\u003e\n\u003cli\u003e1mm thick\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Visqueen","offers":[{"title":"Default Title","offer_id":57301787214156,"sku":"BM008763","price":1261.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-ultimate-geoseal-1233883896.jpg?v=1776865646"},{"product_id":"powerbase-voc-membrane","title":"Powerbase VOC Membrane","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePowerbase VOC is an innovative multilayered barrier membrane comprising protective polymeric layers on both sides of a hydrocarbon and chemical resistant inner core. It provides exceptional resistance to volatile organic compounds (VOCs) and harmful gases including hydrocarbons, methane, radon and carbon dioxide, making it the specification choice for developments on brownfield sites or contaminated land where protection against a broad spectrum of toxic vapours and gases is required.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIndependently tested to ISO 15105-2 and compliant with BS 8485:2015+A1:2019. Supplied in extra-wide 3m x 50m rolls, offering labour savings on site due to fewer overlaps required compared to standard width membranes. Also functions as a damp proof membrane.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eProtection against VOCs, hydrocarbons, methane, radon and CO2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSpecifically designed for brownfield and contaminated land developments\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSupplied in an extra wide 3m roll \u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eMultilayered barrier with hydrocarbon and chemical resistant inner core\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePOWERBASE VOC membranes are joined by conventional thermal (hot air\/wedge) welding equipment to provide overlapped seams for optimum barrier integrity.\u003c\/li\u003e\n\u003cli\u003e The membranes can be overlapped and joined using POWERBOND sealing and jointing self-adhesive tapes.\u003c\/li\u003e\n\u003cli\u003eEnsure no risk of puncture or abrasion on surface before laying membrane \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITP","offers":[{"title":"Default Title","offer_id":57398957015372,"sku":"BM06270","price":878.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/itp-powerbase-voc-membrane-1234664935.jpg?v=1777369633"},{"product_id":"powerbase-low-perm","title":"Powerbase Low Perm","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eLow Perm is a robust 500 micron gas barrier membrane designed to protect buildings against radon and low levels of methane and carbon dioxide. Independently tested to ISO 15105-1, it achieves excellent permeation resistance across all three gases, with permeation rates of 216 ml\/m²\/day for methane, 952 ml\/m²\/day for CO2 and 7.2 x 10⁻¹² m²\/s for radon, making it a reliable choice for sites where basic gas protection measures are required.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eBBA certified and compliant with NHBC gas protection measures for Green and Amber 1 sites. Also provides damp proof membrane protection. Yellow in colour for easy site identification. Supplied in 4m x 20m rolls.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cb\u003eImportant note; \u003c\/b\u003ewhere higher levels of methane or CO2 protection are required, or where VOC or hydrocarbon protection is needed, Powerbase Multigas or Powerbase VOC should be specified instead.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e500 micron gas barrier membrane for radon and low-level methane and CO2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITP","offers":[{"title":"Default Title","offer_id":57399017308492,"sku":"BM06271","price":87.79,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/itp-powerbase-low-perm-1234677229.jpg?v=1777376910"},{"product_id":"powerbase-multigas","title":"Powerbase Multigas","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePowerbase Multigas is a premium multilayer reinforced LDPE gas barrier membrane engineered to provide durable and reliable protection against radon, methane and carbon dioxide for buildings on sites with moderate to high gas risk. The membrane has high tear and impact resistance and also provides damp proof membrane protection. Green\/silver in colour. CE marked. Supplied in 2m x 50m rolls.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePowerbase Multigas 300 is independently tested to ISO 15105-1 and compliant with BS 8485:2015, achieving a methane permeation rate of 0.07 ml\/m²\/day. NHBC Green, Amber 1 and Amber 2 compliant.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePowerbase Multigas 500 is the higher specification grade, BBA certified and compliant with BS 8485:2015+A1:2019. NHBC Green, Amber 1 and Amber 2 compliant. CE marked.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePremium multilayer reinforced LDPE gas barrier membrane\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eProtection against radon, methane and carbon dioxide\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eMethane permeation 0.07 ml\/m²\/day\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eNHBC Green, Amber 1 and Amber 2 compliant\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAlso provides damp proof membrane protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCE marked\u003c\/li\u003e\n\u003cli\u003eMultigas 300, independently tested to ISO 15105-1, BS 8485:2015 compliant\u003c\/li\u003e\n\u003cli\u003eMultigas 500, BBA certified, BS 8485:2015+A1:2019 compliant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e","brand":"ITP","offers":[{"title":"Multigas 300","offer_id":57399103062348,"sku":"BM06272","price":259.9,"currency_code":"GBP","in_stock":true},{"title":"Multigas 500","offer_id":57399103095116,"sku":"BM06273","price":328.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/itp-powerbase-multigas-1234677226.jpg?v=1777376893"},{"product_id":"rhinoplast-evolution-gas-barrier","title":"Rhinoplast Evolution Gas Barrier","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRhinoplast Evolution is a high specification co-extruded multi-layer gas barrier membrane developed using the latest co-extrusion technology. At 0.4mm thick, it consists of fourteen layers including two layers of EVOH gas barrier polymer encased in polyethylene outer layers. This construction provides outstanding protection against volatile organic compounds, hydrocarbons, methane, radon and carbon dioxide without the need for aluminium foil or reinforcement, allowing the membrane to be installed in direct contact with concrete without risk of corrosion. Purple in colour. Single wound to achieve a flat surface, with coverage of 100m² per roll.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDesigned for loose-laid applications, Rhinoplast Evolution is suitable for full line-out installations or in combination with the Evolution Gas DPC. It can be positioned above or below concrete ground floor slabs and above precast suspended segmental ground floor systems such as beam and block floors. Compliant with BS 8485:2015+A1:2019 and incorporates the performance guidance of CIRIA C748:2014. BBA approved. NHBC Amber 1 and Amber 2 compliant. CE marked for waterproofing to EN 13967:2012+A1:2017. Suitable for all characteristic Gas Situation (CS) ground gas regimes. Also provides damp proof membrane protection. A fully integrated system of components including tapes, protection fleece, preformed corners, top hats and gas resistant DPC is available.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e14 layers - high specification\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTwo layers of EVOH gas barrier \u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eBBA approved\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eNo aluminium foil, safe for direct contact with concrete\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAlso provides DPM protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eExcellent welding characteristics\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSingle wound to achieve a flat surface\u003c\/li\u003e\n\u003cli\u003eDesigned for loose laid applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Principal Building Products","offers":[{"title":"Default Title","offer_id":57484049285452,"sku":"SD00131","price":382.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/principal-building-products-rhinoplast-evolution-gas-barrier-1237074895.png?v=1778161512"},{"product_id":"rhinoplast-evolution-hd-gas-barrier","title":"Rhinoplast Evolution HD Gas Barrier","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRhinoplast Evolution HD is the highest specification product in the Rhinoplast gas barrier range — a heavy duty chemically resistant co-extruded multi-layer gas barrier membrane developed using the latest co-extrusion technology. At 0.6mm thick, it consists of fourteen layers including two layers of EVOH gas barrier polymer encased in high-density polyethylene (HDPE) outer layers. The HDPE construction provides superior robustness and chemical resistance compared to the standard Evolution, making it the specification choice for the most challenging sites contaminated by volatile organic compounds, hydrocarbons and ground gases. Brown in colour. Single wound to provide a flat, even surface. Coverage 50m² per roll at 1.65m x 30.5m.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDesigned for loose-laid applications, the Evolution HD is suitable for full line-out installations or in combination with the Evolution Gas DPC. It can be positioned above or below concrete ground floor slabs, above precast suspended segmental ground floor systems such as beam and block floors, or within the ground beneath floor constructions. The system is adaptable with venting layers and can be installed using sealing tapes or fully welded for VOC applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eLike the standard Evolution, the HD membrane contains no aluminium foil or reinforcement, allowing it to be installed in direct contact with concrete without risk of corrosion. Compliant with BS 8485:2015+A1:2019 and incorporates the performance guidance of CIRIA C748:2014. NHBC Amber 1 and Amber 2 compliant. Follows NHBC Foundation NF94 guidance for Type A, B and C membrane locations. Fully compliant with BR 211:2023. CE marked for waterproofing to EN 13967:2012+A1:2017. Suitable for all characteristic Gas Situation (CS) ground gas regimes. Also provides damp proof membrane protection.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTwo layers of EVOH gas barrier polymer\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eHDPE outer layers for superior robustness and chemical resistance\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eProtection against VOCs, hydrocarbons, methane, radon and CO2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSuitable for fully welded systems\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAlso provides DPM protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHighest specification in the Rhinoplast range\u003c\/li\u003e\n\u003cli\u003eSuitable for all CS ground gas regimes\u003c\/li\u003e\n\u003cli\u003eFollows NHBC Foundation’s NF94 guidance for use in Type A, Type B and Type C membrane locations\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSufficiently durable to remain serviceable for the anticipated life of the building and duration of gas emissions.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Principal Building Products","offers":[{"title":"Default Title","offer_id":57484318409036,"sku":"BM004423","price":345.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/principal-building-products-rhinoplast-evolution-hd-gas-barrier-1237080088.png?v=1778168792"},{"product_id":"visqueen-zedex-cpt-high-performance-dpc-cavity-tray","title":"Visqueen Zedex CPT High Performance DPC \u0026 Cavity Tray","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eVisqueen Zedex CPT is a high performance damp proof course and cavity tray system used across residential and commercial masonry construction. Manufactured from a flexible 0.8mm co-polymer thermoplastic, it combines damp proofing with gas resistance in a single product, which makes it a versatile choice where both moisture and ground gas need to be addressed within the same detail.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe membrane is BBA certified and has been assessed in accordance with NHBC Technical Requirement R3, so it is suitable for use on NHBC sites. As part of the Visqueen Low Permeability Gas Membrane system it provides gas protection to NHBC Amber 1, and it can be used alongside the Visqueen radon membranes where radon protection is required. Preformed units are available to simplify more complex or awkward detailing.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal\"\u003eBBA certified for independent third party assurance\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal\"\u003eAssessed to NHBC Technical Requirement R3 and suitable for NHBC sites\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal\"\u003eExcellent tear resistance so ideal for site\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCan be used with the Visqueen radon membranes for radon protection\u003c\/li\u003e\n\u003cli\u003eWidths from 100mm to 1400mm to suit a wide range of applications\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Visqueen","offers":[{"title":"100mm","offer_id":57819365212492,"sku":"BMD6651","price":9.56,"currency_code":"GBP","in_stock":true},{"title":"112.5mm","offer_id":57819365245260,"sku":"BMD6652","price":10.76,"currency_code":"GBP","in_stock":true},{"title":"150mm","offer_id":57819365278028,"sku":"BMD6653","price":14.34,"currency_code":"GBP","in_stock":true},{"title":"225mm","offer_id":57819365310796,"sku":"BMD6654","price":21.51,"currency_code":"GBP","in_stock":true},{"title":"300mm","offer_id":57819365343564,"sku":"BMD6655","price":28.69,"currency_code":"GBP","in_stock":true},{"title":"337.5mm","offer_id":57819365376332,"sku":"BMD6656","price":32.27,"currency_code":"GBP","in_stock":true},{"title":"450mm","offer_id":57819365409100,"sku":"BMD6657","price":43.02,"currency_code":"GBP","in_stock":true},{"title":"600mm","offer_id":57819365441868,"sku":"BMD6658","price":57.36,"currency_code":"GBP","in_stock":true},{"title":"900mm","offer_id":57819365474636,"sku":"BMD6659","price":86.04,"currency_code":"GBP","in_stock":true},{"title":"1000mm","offer_id":57819365507404,"sku":"BMD6660","price":95.6,"currency_code":"GBP","in_stock":true},{"title":"1200mm","offer_id":57819365540172,"sku":"BMD6661","price":114.72,"currency_code":"GBP","in_stock":true},{"title":"1400mm","offer_id":57819365572940,"sku":"BMD6662","price":133.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/visqueen-visqueen-zedex-cpt-high-performance-dpc-cavity-tray-1244641721.jpg?v=1781602891"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/collections\/riw-riw-sheetseal-226-1232467558.jpg?v=1776263227","url":"https:\/\/www.constructionsuppliesuk.co.uk\/collections\/gas-resistant-membranes.oembed","provider":"Construction Supplies UK","version":"1.0","type":"link"}