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CLS timber, also known as Canadian Lumber Standard timber, is a type of timber commonly used in construction, particularly in the UK. Our CLS is untreated so suitable for inside use only unless treated. Studwork: Commonly used for framing in walls, partitions, and other structural applications within buildings. Roofing: Employed in the construction of roof trusses and other roofing structures. Flooring: Utilized in the construction of floor joists and other supporting structures for flooring. General Construction: Suitable for various other construction purposes, including decking, fencing, and garden structures.