{"product_id":"18mm-p5-moisture-resistant-chipboard-flooring-t-g-2400mm-x-600mm","title":"18mm P5 Moisture Resistant Chipboard Flooring T\u0026G 2400mm x 600mm (8' x 2')","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003e18mm P5 Moisture Resistant Chipboard Flooring measuring 2400mm x 600mm. This high-density particleboard is engineered specifically for structural flooring applications where increased humidity or incidental moisture may occur. The panels feature precision-machined tongue-and-groove profiles on all four edges, enabling an interlocking \"floating\" or fixed deck that significantly reduces the risk of independent board movement and surface squeaking.\u003cbr\u003e\u003cbr\u003eAt a 18mm thickness, these boards provide a robust load-bearing sub-base suitable for domestic renovations, loft conversions, and overlaying existing uneven timber floors. The P5 classification ensures superior dimensional stability and structural integrity compared to standard P2 grades, resisting the swelling and degradation typically caused by moisture ingress during the construction phase. The 600mm width is specifically designed for ease of handling in confined spaces, such as attics or narrow corridors, while ensuring the structural integrity of the floor at a thickness of 18mm.\u003cbr\u003e\u003cbr\u003eFor projects requiring a different material composition with similar structural capabilities, \u003ca href=\"https:\/\/materialsmarket.com\/products\/18mm-osb-3-tongue-groove-flooring-board-2400mm-x-590mm\"\u003e18mm OSB 3 Tongue \u0026amp; Groove Flooring\u003c\/a\u003e is a suitable alternative.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eP5 moisture-resistant grade\u003c\/strong\u003e: Certified to EN 312 for load-bearing use in humid internal conditions, including kitchens and bathrooms. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-density particleboard\u003c\/strong\u003e: Engineered construction provides high compressive strength and resistance to structural weakening from moisture. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTongue-and-groove profiles\u003c\/strong\u003e: Precision-fit edges on all four sides ensure a secure, interlocking joint that minimises vertical movement between panels. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSanded surface finish\u003c\/strong\u003e: Provides a smooth, level face that is ready for the direct application of underlays, carpets, or laminate flooring.  \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced workability\u003c\/strong\u003e: The board composition allows for clean cuts and secure fastener retention when using standard woodworking tools. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2400mm x 600mm dimensions\u003c\/strong\u003e: Optimised for rapid coverage and easy manual handling through standard doorways and up staircases. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStructural 18mm thickness\u003c\/strong\u003e: Designed for installation over joists at 400mm centres or as a high-strength overlay for existing floor structures.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDomestic structural flooring\u003c\/strong\u003e: 18mm profile serves as the primary load-bearing sub-floor for bedrooms and living areas with joist centres up to 400mm. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKitchen and bathroom sub-floors\u003c\/strong\u003e: P5 moisture-resistant classification prevents dimensional instability in humid environments when joints are correctly glued. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoft conversions\u003c\/strong\u003e: Lightweight 18mm boards provide a durable structural surface for transforming attic spaces into habitable rooms. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor overlays and levelling\u003c\/strong\u003e: Used to provide a flat, stable foundation over existing floorboards in refurbishment projects before laying final floor coverings. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemporary site walkways\u003c\/strong\u003e: Provides a robust, slip-resistant surface for protected pedestrian access during internal construction phases.\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Guidance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcclimatise the boards\u003c\/strong\u003e: Store panels flat in the room of installation for 48 hours to equalise moisture content with the surrounding environment. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck joist spacing\u003c\/strong\u003e: Ensure joists are level and spaced at maximum 400mm centres for 18mm boards to prevent excessive deflection under load. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply joint adhesive\u003c\/strong\u003e: Run a continuous bead of D3 or D4 grade moisture-resistant PVA glue along both the tongue and the groove to create a silent, waterproof bond. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStagger the joints\u003c\/strong\u003e: Lay boards in a staggered \"broken bond\" pattern, ensuring that short-end joints always fall directly over a supporting joist. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintain expansion gaps\u003c\/strong\u003e: Leave a minimum 10mm to 12mm expansion gap around the entire perimeter of the room and at all rigid obstructions like radiator pipes. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixing intervals\u003c\/strong\u003e: Secure boards using ring-shank nails or carcass screws at 200mm intervals along supported edges and 300mm on intermediate joists. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountersink fasteners\u003c\/strong\u003e: Ensure all screw or nail heads are driven 2mm below the surface to prevent \"grinning\" through the final floor covering. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal perimeter edges\u003c\/strong\u003e: Treat all field-cut edges with a suitable wood sealant if they are likely to be exposed to moisture near plumbing or external doorways.\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompliance \u0026amp; Performance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard classification\u003c\/strong\u003e: EN 312 P5 moisture-resistant, structural grade particleboard for internal use. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService class\u003c\/strong\u003e: Rated for Service Class 1 (dry) and Service Class 2 (humid) environments. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire rating\u003c\/strong\u003e: Standard Euroclass D performance; can be enhanced with appropriate fire-retardant treatments or underlays. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental status\u003c\/strong\u003e: E1 formaldehyde emission compliant for safe use in domestic and commercial interior living spaces. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant note\u003c\/strong\u003e: While P5 grade is moisture-resistant, it is not waterproof; all standing water must be removed immediately to prevent long-term thickness swelling.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Unbranded","offers":[{"title":"18mm","offer_id":53771573330031,"sku":"4005001","price":11.58,"currency_code":"GBP","in_stock":false},{"title":"22mm","offer_id":53771573362799,"sku":"4005002","price":13.8,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/18mm_P5_moisture_resistant_TG_flooring_-_Photo_1_-_1920_comp.jpg?v=1783758853","url":"https:\/\/supplyyard.co.uk\/products\/18mm-p5-moisture-resistant-chipboard-flooring-t-g-2400mm-x-600mm","provider":"Supply Yard","version":"1.0","type":"link"}