scope:

Specifies permitted deviations (due to variability in sawing and machining) from target sawn and prepared thickness, widths and lengths for structural timber of coniferous species and poplar (Populus sp.).It also specifies the moisture content to be used as a reference point for the measurement of sizes, and gives average values for changes in size due to changes in moisture content. It is applicable to sawn and prepared square-edged timber with parallel edges having sawn thicknesses or widths in the range 24 mm to 300 mm. The average actual thickness and the average actual width of square-edged timber shall not be less than the target sizes, marking allowance for changes in size due to changes in moisture content.