{"product_id":"sawn-kiln-dried-regularised-c24-timber-47mm-x-125mm","title":"Sawn Reg C24  Structural Timber  47mm x 125mm","description":"\u003cp\u003eC24 structural timber 47mm x 125mm is a stress-graded, regularised section suited to load-bearing construction work including floor joists, rafters, and studwork. Kiln dried to 20% moisture content or less for dimensional stability and compliance with UK building regulations.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSoftwood (spruce\/pine\/fir)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrade\u003c\/td\u003e\n\u003ctd\u003eC24, stress graded to BS 4978\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eSawn, regularised (planed to consistent dimensions with eased corners)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e47mm x 125mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLengths\u003c\/td\u003e\n\u003ctd\u003e3.6m (12ft), 4.8m (16ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTreatment\u003c\/td\u003e\n\u003ctd\u003eKiln dried to 20% moisture content or less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProfile\u003c\/td\u003e\n\u003ctd\u003eRegularised with eased arrises\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat it's used for\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFloor joists in domestic and commercial timber frame construction\u003c\/li\u003e\n\u003cli\u003eRoof rafters and ridge boards where C24 grade is specified by an engineer or building control\u003c\/li\u003e\n\u003cli\u003eStudwork in load-bearing timber frame walls\u003c\/li\u003e\n\u003cli\u003eGeneral structural carcassing where span and load capacity require a higher grade than C16\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitting and handling\u003c\/h2\u003e\u003cp\u003eAllow the timber to acclimatise on site for at least 24 to 48 hours before fixing, keeping it stacked flat on bearers off the ground and under cover to prevent moisture uptake. Use galvanised or stainless steel fixings throughout to avoid corrosion staining, and where joist hangers or structural connectors are specified, ensure they are rated for C24 timber. Store any unused lengths flat and supported at regular intervals to prevent bowing.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between C16 and C24 structural timber?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eC24 is a higher stress grade than C16, meaning each piece has been tested and confirmed to carry greater loads over longer spans. It is specified where structural calculations or building control require increased strength, for example in floor joists at wider centres or in roof rafters with longer rafter runs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does regularised mean on sawn timber?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eRegularised timber has been passed through a planer to bring all pieces to a consistent depth, which makes it easier to achieve level floors and plumb walls without packing. The arrises (corners) are also eased to reduce the risk of splits and splinters during handling. The face and edge remain sawn in appearance rather than fully smooth.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this timber suitable for use in a structural floor without further treatment?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor most above-ground internal floor joist applications in a ventilated, dry environment this section can be used without preservative treatment. If the timber will be close to or in contact with masonry, near an external wall, or in a poorly ventilated subfloor void, a preservative-treated section should be considered. Always confirm requirements with your structural engineer or building control officer.\u003c\/p\u003e\u003cp\u003eBrowse the full range of \u003ca href=\"\/collections\/c24-graded-timber\"\u003eC24 graded timber\u003c\/a\u003e at Nottage Timber Merchants. We supply trade and retail customers across South Wales, with next-day delivery available to the Bridgend area and surrounding regions.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between C16 and C24 structural timber?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"C24 is a higher stress grade than C16, meaning each piece has been tested and confirmed to carry greater loads over longer spans. It is specified where structural calculations or building control require increased strength, for example in floor joists at wider centres or in roof rafters with longer rafter runs.\"}}, {\"@type\": \"Question\", \"name\": \"What does regularised mean on sawn timber?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Regularised timber has been passed through a planer to bring all pieces to a consistent depth, which makes it easier to achieve level floors and plumb walls without packing. The arrises (corners) are also eased to reduce the risk of splits and splinters during handling. The face and edge remain sawn in appearance rather than fully smooth.\"}}, {\"@type\": \"Question\", \"name\": \"Is this timber suitable for use in a structural floor without further treatment?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"For most above-ground internal floor joist applications in a ventilated, dry environment this section can be used without preservative treatment. If the timber will be close to or in contact with masonry, near an external wall, or in a poorly ventilated subfloor void, a preservative-treated section should be considered. Always confirm requirements with your structural engineer or building control officer.\"}}]}\u003c\/script\u003e","brand":"Nottage Timber Merchants","offers":[{"title":"3.6m \/ 3600mm \/ 12ft","offer_id":52565934473553,"sku":"CARC4712536","price":11.85,"currency_code":"GBP","in_stock":true},{"title":"4.8m \/ 4800mm \/ 16ft","offer_id":52565934506321,"sku":"CARC4712548","price":15.89,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/1467\/1697\/files\/c24-47-x-125-600x599__88173.1721255474.1280.1280.jpg?v=1765211652","url":"https:\/\/www.timberonline.co.uk\/products\/sawn-kiln-dried-regularised-c24-timber-47mm-x-125mm","provider":"Nottage Timber Merchants","version":"1.0","type":"link"}