At Supreme Timber we have structural C24 timber that comes pressure treated to prevent rot and decay, regularised to ensure a consistent size and strength graded for known structural performance. Typically treated it can be used for various indoor/outdoor domestic applications such as joists for roof, floors and decking and other general joinery applications. C24 also has a better finish to C16, it is almost dressed quality and is often used for pergolas and other garden projects. C24 graded premium structural timber offers greater strength than C16 timber, that can handle higher loads and wider spans. It is the better-quality structural option because it can take up to 50% longer for these timbers to grow.