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C16 & C24 Treated Timber

(13 products)

C24 treated timber is a premium strength-graded structural softwood (class C24 under EN 338) that offers superior load-bearing capacity, fewer knots and defects, and better stability compared to standard C16 timber. Ideal for demanding UK construction projects including floor joists, roof rafters, timber framing, and external structures when pressure-treated, C24 graded timber ensures compliance with building regulations while allowing longer spans and heavier loads.

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Frequently Asked Questions

What is the difference between C16 and C24 timber?

C24 is a higher-grade timber than C16. It is stronger, has fewer knots, and is better suited for high-load structural applications like floor joists or roof rafters.

What is the difference between C24 and C16 timber?

C24 is a superior structural grade. It has fewer and smaller knots than C16, making it stronger and more resilient. Because it is denser, it can handle higher loads and longer spans, which is why it is the standard for heavy-duty structural work like floor joists and roof rafters.

Is this timber "Regularised"?

Yes, this timber is Regularised (finished to a consistent size). It is planed to ensure the width and thickness are uniform across every length, and the edges are usually slightly rounded (eased). This makes it much easier to handle and ensures your frame or floor remains perfectly level.

Can I use C24 timber for outdoor projects like decking frames?

Yes, our treated timber forces preservative deep into the wood fibres, protecting the timber against rot, fungal decay, and insect attack, making it suitable for ground contact and external structures.