Looking for the perfect timber for the job? We supply C16 & C24 timber in herefordshire, powys, shropshire, gloucestershire & most locations surrounding these area's. What is C24 timber? C24 timber is classed as one of the highest quality timbers available to purchase in the UK. similar to C16 timber, it is also (KD) kiln-dried to reduce the moisture content within the timber, it typically has fewer defects, in terms of both characteristics and appearance. this makes it stronger and more resilient for structural use on building frames & other applications.