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Services - Grading

Robert Duncan Timber is committed to consistently supplying timber that meets the requirements of today's Building Standards.

Timber is widely used in the construction industry due to its versatility, durability and strength. Strength Grading is a method of determining the strength of a piece of timber destined for structural use.

Robert Duncan Timber has TRADA trained visual graders on-site to grade timber to the specified strength requirement. We can grade to industry recognised C16 and C24 strength requirements.



BM TRADA regulates our graders. Each piece of timber is examined by the graders to assess it for the presence of naturally occurring growth characteristics that can affect strength, including the slope of grain, rate of growth and knot content.

There are specific grading rules that stipulate the acceptable limits for these features.

We stamp our graded timber with the company's and the individual grader's reference so that it is fully traceable. For exposed pieces a grading certificate can also be supplied.

As the moisture content can affect the strength and stability of the timber, we can also supply dry graded timber, where the moisture content of the timber is less than 20% at the time of grading.

Timber can also be machine graded for stiffness of the timber, as there is a link between stiffness of timber and its strength properties.

Robert Duncan Timber stocks a wide range of machine graded timbers.