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C24 Timber Floor Joists

C24 is a slower-growing softwood timber which has fewer knots in it because the trees C24 timber comes from grow much slower than those which C16 timber comes from. C24 timber is a premium choice of timber floor joists owing to its greater strength when compared to C16 timber. In general terms, C24 regularised timber is a carcassing timber that is used for joists, rafters and timber frames where the wood is not exposed to the elements. It is generally used for load bearing and for principal structural elements of a timber frame, internal walls, etc. 

Read This Blog on C16 and C24 timber, wood or lumber?