{"product_id":"tongue-and-groove-osb3-flooring-boards","title":"Tongue and Groove OSB3 Flooring Boards","description":"\u003cp\u003eTongue and groove OSB3 flooring boards provide a structural, load-bearing sheet solution for subfloors, loft boarding, roofing decks and wall sheathing. The interlocking T\u0026amp;G profile creates a tight, level surface between sheets, and factory-sealed edges help control moisture ingress. Available in 18mm thickness at 600mm x 2440mm.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOriented strand board (OSB)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOSB3 - structural use in humid conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProfile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTongue and groove (T\u0026amp;G) long edges\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18mm (3\/4 inch) x 600mm x 2440mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFactory-sealed edges\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUse Class\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStructural - humid\/load-bearing applications\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat it's used for\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSubfloor decking on timber joists in new builds and refurbishments\u003c\/li\u003e\n  \u003cli\u003eLoft boarding to create usable storage space over ceiling joists\u003c\/li\u003e\n  \u003cli\u003eFlat roofing decks as a structural sarking layer beneath the waterproof finish\u003c\/li\u003e\n  \u003cli\u003eWall and ceiling sheathing where a structural panel with moisture resistance is required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFitting and handling\u003c\/h2\u003e\n\u003cp\u003eAllow boards to acclimatise in the installation area for at least 24 hours before laying, particularly in loft or ground-floor subfloor situations where temperature and humidity can vary. Fix through the face into joists at 150mm centres around the perimeter and 300mm centres internally, using ring-shank nails or screws appropriate for the joist depth. Leave a 3mm expansion gap at walls and perimeter edges to allow for seasonal movement.\u003c\/p\u003e\n\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between OSB2 and OSB3 flooring boards?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOSB3 is rated for structural use in humid conditions under EN 300, whereas OSB2 is only suitable for dry interior conditions. For subfloors, loft boarding or roofing decks where moisture exposure is possible, OSB3 is the appropriate choice and is widely specified by UK building regulations and warranties.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan T\u0026amp;G OSB3 be used as a finished floor surface?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOSB3 tongue and groove boards are intended as a structural subfloor rather than a decorative finish. They are designed to receive floor coverings such as carpet, vinyl, ceramic tiles (with suitable adhesive) or engineered flooring. The surface texture is not suitable as a standalone wear layer in occupied spaces.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat joist spacing is 18mm OSB3 rated for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e18mm OSB3 T\u0026amp;G flooring boards are generally suitable for joist centres up to 600mm, which aligns with the 600mm board width so joints always fall on a support. For spans up to 450mm centres the boards perform well under standard domestic loading. Always confirm with your structural requirements and local building control where applicable.\u003c\/p\u003e\n\n\u003cp\u003eNottage Timber Merchants hold T\u0026amp;G OSB3 flooring boards in stock at our Bridgend yard, with delivery available throughout South Wales. Browse our full range of \u003ca href=\"\/collections\/subfloor-loft-boards\"\u003esubfloor and loft boards\u003c\/a\u003e for complementary sheet materials, or contact the yard for volume pricing and next-day delivery options across the Bridgend area.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between OSB2 and OSB3 flooring boards?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"OSB3 is rated for structural use in humid conditions under EN 300, whereas OSB2 is only suitable for dry interior conditions. For subfloors, loft boarding or roofing decks where moisture exposure is possible, OSB3 is the appropriate choice and is widely specified by UK building regulations and warranties.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can T\u0026G OSB3 be used as a finished floor surface?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"OSB3 tongue and groove boards are intended as a structural subfloor rather than a decorative finish. They are designed to receive floor coverings such as carpet, vinyl, ceramic tiles or engineered flooring. The surface texture is not suitable as a standalone wear layer in occupied spaces.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What joist spacing is 18mm OSB3 rated for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"18mm OSB3 T\u0026G flooring boards are generally suitable for joist centres up to 600mm, which aligns with the 600mm board width so joints always fall on a support. For spans up to 450mm centres the boards perform well under standard domestic loading. Always confirm with your structural requirements and local building control where applicable.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Nottage Timber Merchants","offers":[{"title":"18mm (3\/4 Inch) \/ 600mm x 2440mm (2ft x 8ft)","offer_id":52565694153041,"sku":"OSBTG18","price":16.91,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/1467\/1697\/files\/Tongue-and-Groove-OSB3-Flooring-Nottage-Timber-Merchants_1029__02640.1724753619.1280.1280.jpg?v=1765210334","url":"https:\/\/www.timberonline.co.uk\/products\/tongue-and-groove-osb3-flooring-boards","provider":"Nottage Timber Merchants","version":"1.0","type":"link"}