Making the GradeLearn more about the different grades of wood available
Universal Wood Grading Criteria
In these days of international legislation, there is no single, definitive framework that can be used as an International Standard for Timber Grades.
The rules and standards on timber grading differ from country to country, and even from species to species. This is understandably confusing for our customers. Oak, however, is by far our most popular species so, in order to show you a typical spread of grain formation and the properties for each grading description, we have chosen this species as an example of what to expect.
At VidaSpace we deal with a number of mills who work to varying parameters, so we have shown what is likely to be the “worst case” in terms of knot size; many individual planks will fall well within this. But please do remember, since they are usually selected by eye, there is always scope for an occasional board to fall outside of these parameters. Part of the beauty of timber is that each and every plank is unique, so these parameters should be taken simply as an indication, given in good faith and to the best of our knowledge.
Please be aware that VidaSpace cannot accept rejection of an entire project on the basis of a small number of boards. We strongly advise that our projects should only be fitted by a competent installer who will, as a matter of course, remove any defects within the normal cutting allowance. We cannot accept rejection of any project once it has been laid.
Typically, prime grade has few, if any knots, and these will be of minimal size. There will also be a minimal amount of sapwood defects and filler, if any at all. Where filler is used its colour is carefully selected to complement the wood rather than to match it exactly, and the colour of the filler may vary from batch to batch. There will be a relatively small amount of colour variation in the timber itself.
Typically, select grade will have a mix of almost prime boards with other planks which have more knots. Slightly larger knots are allowed in this grade. Heartwood and colour variation in the timber should be expected and there may be some checks (cracks across the growth ring), sapwood and filler. The colour of the filler is carefully selected to complement the wood rather than to match it exactly and it may vary from batch to batch.
Known as either character or classic grade, typically this allows a wider range of colour variation. Knots are larger and you should expect checks (cracks across the growth ring) and possibly some end shake (cracks between the rings). Filler will be used, the colour of which is carefully selected to complement the wood rather than to match it exactly, and it may vary from batch to batch.
Known as either natural or rustic grade this allows a virtually limitless size and number of knots. Heartwood will be used, there will be colour variation, sapwood and filler; you should also expect checks (cracks across the growth ring) and possibly some end shake (cracks between the rings). The colour of the filler is carefully selected to complement the wood rather than to match it exactly and it may vary from batch to batch.