C24 Grade 47 x 125mm x 3.6m Treated Timber
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Product Details
C24 grade timber is a high-strength softwood specifically engineered for structural applications where heavy loads and long spans are required, making it ideal for floor joists, roof rafters, wall framing, and other load-bearing work in both internal and external projects. The "C24" designation refers to its minimum bending strength of 24 N/mm², which makes it significantly stronger and more durable than lower grades like C16, with fewer knots and a tighter grain structure. This 47mm x 125mm section is a popular choice for demanding DIY and building projects, offering the extra strength needed where standard timber might require additional support. The timber has been kiln-dried to reduce moisture content and treated to resist rot, fungal decay, and insect attack, making it suitable for use in damp environments and outdoor applications when properly sealed. Its superior quality and reliability make it an excellent choice when you need timber that will perform reliably under stress without warping or degrading over time.
As of August 2026, PriceNailer data confirms that the cheapest price for C24 Grade 47 x 125mm x 3.6m Treated Timber is £7.49 from MKM across 6 suppliers. Prices have increased by 10.9% over the last 7 months.
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Frequently Asked Questions
What is C24 grade timber and how strong is it?
C24 grade timber has a minimum bending strength of 24 N/mm², making it significantly stronger than C16 grade timber. It's specifically engineered for structural applications where high strength and load-bearing capacity are essential.
What can I use 47 x 125mm C24 timber for?
This size is ideal for floor joists, roof rafters, wall framing studs, and structural beams where spans up to 4-5 metres are required. It's commonly used in construction where standard timber grades wouldn't provide sufficient strength.
Is treated C24 timber suitable for outdoor use?
Yes, the pressure treatment protects against rot, fungal decay, and insect attack, making it suitable for outdoor structural applications. However, it should still be properly sealed and maintained for maximum durability in exterior conditions.
How many 47 x 125mm joists do I need per square metre?
For floor joists, you typically need one joist every 400mm centres, which equals approximately 2.5 joists per square metre. Always consult structural calculations and building regulations for your specific application.
What's the difference between C24 and C16 grade timber?
C24 has a bending strength of 24 N/mm² compared to C16's 16 N/mm², making it 50% stronger. C24 also has fewer knots, tighter grain structure, and can span longer distances without additional support.