Treated Timber Joist 47 x 100mm C24
Treated Timber Joists are a robust and reliable choice for a wide range of construction and structural applications. Often referred to as softwood carcassing timber, these joists are C24 graded, meaning they meet strict structural standards for strength, stability, and performance in load-bearing projects.
Each piece is pressure treated to protect against moisture, decay, and insect damage, making it suitable for above-ground use where there is an occasional risk of wetting. The timber is planed and regularised, giving it smooth surfaces, eased edges, and consistent dimensions for easy handling and a professional appearance.
These joists are also kiln dried to maintain a low and stable moisture content, which enhances their strength and prevents issues such as warping, twisting, or splitting over time. Available in 3.0m, 3.6m, 4.2m, 4.8m, and 6.0m lengths, they are ideal for roofing, flooring, wall framing, decking frameworks, and general carcassing.
Backed by a 70% PEFC certification, this timber is responsibly sourced and environmentally conscious, ensuring a sustainable option without compromising on quality or durability.
Key Specifications
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Section Size: 47 x 100mm
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Finished Size (Approx.): 45 x 95mm
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Lengths Available: 3.0m, 3.6m, 4.2m, 4.8m, 6.0m
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Grade: C24 (Structural)
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Treatment: Pressure Treated for protection and longevity
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Finish: Planed and Regularised with Eased Edges
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Moisture Content: Kiln Dried for improved stability
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Certification: 70% PEFC Certified
FAQs
What is C24 timber used for?
C24 timber is a high-strength structural grade commonly used for flooring, roofing, decking, and wall framing. It provides excellent load-bearing performance with fewer knots and imperfections compared to lower-grade timber.
Can treated C24 timber be used outdoors?
Yes, C24 treated timber is suitable for outdoor use where it may occasionally get wet, such as in decking frameworks or pergolas. However, for ground contact or continuously wet environments, a higher treatment specification is recommended.
Why is kiln drying important for structural timber?
Kiln drying reduces the timber’s moisture content, improving its strength, stability, and resistance to movement. This process also helps the preservative treatment penetrate more deeply, ensuring longer-lasting protection and durability.
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