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Updated July 29, 2012, 9:06 am betterhomesgardens
Timber comes in standard lengths, grading and dressing. Make sure you specify the right one for your job.
Select (No. 1 clears): Has straight grain, is free of knots and is suitable for high-quality cabinetwork.
Select merchantable: Has straight grain but some knots and is used fordoor and window joinery.
Merchantable: Has wavy grain and larger knots and is used for frame construction.
Standard or building: Has sloping grain and larger knots and is used for battens and bracings.
Engineering: Is free of defects and has straight, tight grain for high-quality structural timber.
Stress grading refers to the amount the timber will bend and is shown by an 'F' number - the higher the number, the greater the strength.
6. The stress grade (in construction work)Source: Basic Carpentry Techniques (Murdoch Books)