C24 Grade 47 x 100mm x 2.4m Treated Timber
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Product Details
These stress-graded softwood battens (47x100mm) undergo regularising treatment for consistent sizing. Known as CLS timber or carcassing, their C24 rating indicates superior strength for structural framing compared to common C16 wood. The treatment protects against insect damage in damp environments
As of August 2026, PriceNailer data confirms that the cheapest price for C24 Grade 47 x 100mm x 2.4m Treated Timber is £5.22 from BuildingMaterials.co.uk across 5 suppliers. Prices have decreased by 5.8% over the last 19 months.
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Frequently Asked Questions
What's the difference between C24 and C16 treated timber?
C24 grade timber has superior strength properties compared to C16, with higher bending strength and stiffness values. This makes C24 suitable for structural applications with greater loads, whilst C16 is adequate for general construction work with lighter loads.
What is the actual finished size of 47x100mm CLS timber?
The 47x100mm dimensions are nominal sizes before planing. After regularising treatment, the actual finished size is typically around 45x95mm, giving consistent dimensions for easier construction work.
Is 47x100mm treated timber suitable for external use?
Yes, this treated timber is suitable for external structural framing as it's been pressure-treated to resist insect attack and fungal decay. However, for ground contact applications, you may need higher treatment levels like UC4.
How much weight can C24 grade 47x100mm timber support?
C24 timber has a characteristic bending strength of 24 N/mm², significantly higher than C16 grade. The exact load capacity depends on span, spacing, and load distribution, so structural calculations should be performed for specific applications.
What treatment does this timber receive for protection?
This timber undergoes pressure treatment with preservatives to protect against insect attack and fungal decay. The treatment penetrates deep into the wood fibres, making it suitable for use in damp conditions and external applications.