CLS 100x50mm (4" x 2") 3m
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Product Details
CLS 100x50mm (4" x 2") 3m is kiln-dried softwood timber with a smooth planed finish on all four sides and rounded edges for easy handling in DIY projects. Its finished size is typically 89mm x 38mm, making it perfect for building internal stud walls, partitions, and framing in home extensions or loft conversions. Commonly used in timber frame construction, this C16 strength grade piece offers good stability and strength for non-load-bearing applications. At 3 metres long, it suits standard room heights and cuts easily to size with basic tools. Ideal for indoor use, though untreated versions need protection if exposed to moisture.
As of August 2026, PriceNailer data confirms that the cheapest price for CLS 100x50mm (4" x 2") 3m is £4.85 from BuilderDepot across 8 suppliers. Prices have decreased by 0.8% over the last 8 months.
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Frequently Asked Questions
What are the actual finished dimensions of CLS 100x50mm timber?
CLS 100x50mm timber has finished dimensions of approximately 89mm x 38mm due to the planing process. The nominal size (100x50mm) refers to the rough sawn size before planing and kiln drying.
Is CLS 100x50mm suitable for load-bearing applications?
CLS timber graded C16 is suitable for some structural applications, but you should consult building regulations and a structural engineer for load-bearing projects. It's commonly used for non-load-bearing internal stud walls and partitions.
How many CLS 100x50mm studs do I need per metre of wall?
For standard stud walls, space CLS studs at 400mm or 600mm centres. At 400mm centres you'll need approximately 2.5 studs per metre, at 600mm centres you'll need about 1.7 studs per metre, plus additional studs for door and window openings.
Can I use CLS 100x50mm timber outdoors?
Untreated CLS timber is designed for internal use only and will deteriorate if exposed to moisture outdoors. For external applications, you need pressure-treated timber or apply appropriate wood preservative treatments.
What tools do I need to cut CLS 100x50mm timber?
You can cut CLS timber with a hand saw, circular saw, or mitre saw. The smooth planed finish and softwood composition make it easy to cut with basic DIY tools, though power tools will give cleaner, faster cuts.