{"product_id":"treated-48m-timber-joist-47-x-100mm-c24","title":"Treated 4.8m Timber Joist 47 x 100mm C24","description":"\u003ch3\u003eTreated 4.8m Timber Joist 47 x 100mm C24\u003c\/h3\u003e\n\nTreated Timber Joists are a high-performance, reliable choice for structural construction projects that demand both strength and stability. Commonly referred to as softwood carcassing timber, these joists are graded to C24, ensuring excellent load-bearing capability and long-lasting performance for use in a variety of building applications.\n\nEach joist is pressure treated to enhance protection against moisture, fungal decay, and insect attack — making it suitable for above-ground use where occasional wetting may occur. The timber is planed and regularised, giving it a smooth finish, consistent sizing, and eased edges that make it easier to handle and install.\n\nThe wood is also kiln-dried, a process that reduces moisture content to ensure greater stability and strength while minimising the risk of twisting or warping over time. At 4.8 metres in length, this joist is ideal for applications such as flooring, roofing, decking, and general carcassing where precision and reliability are key.\n\nSustainably sourced and PEFC 70% certified, this timber combines performance, sustainability, and versatility — trusted by both professional builders and DIY enthusiasts alike.\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSection Size:\u003c\/strong\u003e 47 x 100mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFinished Size (Approx.):\u003c\/strong\u003e 72 x 95mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 4.8m\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 protection and 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 improved 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 high structural grade that ensures excellent strength, durability, and minimal defects. It is ideal for load-bearing applications such as joists, roofing, flooring, and wall framing where reliability is essential. \u003ch4\u003eCan C24 treated timber be used outdoors?\u003c\/h4\u003e Yes, it can be used externally in areas that experience occasional wetting, such as decking subframes or outdoor structures. However, for timber in direct ground contact, a higher treatment class is recommended. \u003ch4\u003eWhy is kiln drying important for treated timber?\u003c\/h4\u003e Kiln drying reduces the timber’s moisture content, increasing its strength and stability while preventing movement or warping. It also allows the preservative treatment to penetrate more deeply, extending the lifespan of the timber.","brand":"JJ Building Materials","offers":[{"title":"Default Title","offer_id":54802339692886,"sku":"T00001278","price":18.0,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/jjbuildingmaterials.co.uk\/products\/treated-48m-timber-joist-47-x-100mm-c24","provider":"JJ Building Materials","version":"1.0","type":"link"}