{"product_id":"treated-timber-joist-47-x-225mm-c24","title":"Treated Timber Joist 47 x 225mm C24","description":"\u003ch3\u003eTreated Timber Joist 47 x 225mm C24\u003c\/h3\u003e\n\nTreated Timber Joists are a strong, reliable, and versatile choice for structural construction work. Also known as softwood carcassing timber, these joists are pressure-treated and strength-graded to C24, ensuring they meet the highest standards for use in demanding load-bearing applications.\n\nEach joist is planed and regularised, creating smooth surfaces, eased edges, and consistent sizing for a professional finish and easier handling. The timber is kiln-dried, a process that reduces moisture content to a stable level, increasing both its strength and resistance to movement, shrinkage, or twisting over time.\n\nThese C24-graded joists can be safely used above ground in areas with occasional exposure to moisture, making them suitable for a wide range of structural projects such as flooring, roofing, wall framing, and general carcassing. Available in a variety of lengths from 3.0m to 6.0m, they offer flexibility for both small and large-scale builds.\n\nSourced responsibly and PEFC 70% certified, this timber not only delivers performance but also supports sustainable forestry practices — a trusted choice for professionals across the construction industry.\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSection Size:\u003c\/strong\u003e 47 x 225mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFinished Size (Approx.):\u003c\/strong\u003e 45 x 220mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLengths Available:\u003c\/strong\u003e 3.0m, 3.6m, 4.2m, 4.8m, 6.0m\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eGrade:\u003c\/strong\u003e C24 (Structural)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Pressure Treated for durability\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Planed and Regularised with Eased Edges\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMoisture Content:\u003c\/strong\u003e Kiln Dried for stability\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e 70% PEFC Certified\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003eWhat does C24 mean in timber grading?\u003c\/h4\u003e C24 is a structural strength grade that indicates superior quality timber, capable of withstanding higher loads and offering greater stability than lower grades such as C16. It’s ideal for demanding structural applications like floors, roofs, and joists. \u003ch4\u003eCan C24 treated timber be used outdoors?\u003c\/h4\u003e Yes, it can be used outdoors or in areas exposed to occasional wetting, provided it is properly treated and maintained. For long-term ground contact, use timber specifically rated for direct soil exposure. \u003ch4\u003eWhy is kiln drying important for timber joists?\u003c\/h4\u003e Kiln drying removes excess moisture from the timber, reducing the risk of warping, splitting, and shrinkage. It ensures greater stability and strength, making the timber easier to work with and more durable over time.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/timber\"\u003etimber\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/timber-lengths\"\u003etimber lengths\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"JJ Building Materials","offers":[{"title":"3.0m","offer_id":51585204814166,"sku":"T00001180","price":15.44,"currency_code":"GBP","in_stock":true},{"title":"3.6m","offer_id":51585204846934,"sku":"T00001181","price":18.54,"currency_code":"GBP","in_stock":true},{"title":"4.2m","offer_id":51585204879702,"sku":"T00001182","price":21.62,"currency_code":"GBP","in_stock":true},{"title":"4.8m","offer_id":51585204912470,"sku":"T00001183","price":24.69,"currency_code":"GBP","in_stock":true},{"title":"6.0m","offer_id":51585204945238,"sku":"T00001185","price":39.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/treated-timber-joist-47-x-225mm-c24-9844687.jpg?v=1772656457","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/treated-timber-joist-47-x-225mm-c24","provider":"JJ Building Materials","version":"1.0","type":"link"}