Our grading rules

Rules for thickness 27 mm

We have established quality standards for the sorting of our products in 160+ wide derived from the European standard NF EN 975-1 using the symbol "QF" for the Q of Quercus (the oak) and F for the outputs in Strips and square edged.

The attached photos are just the beginning of explanations. We distinguish the qualities according to two main categories. :

Grading on the two faces 
QF1A  QF1A/1b   QF1b/2   QF2/3
Each board is inspected on both sides to ensure a compliant knot selection. Particular attention is given to the flatness of the board as it is intended for thickness re-sawing. No trace of heart or sapwood is accepted.

Grading on the best face
QF1-2X   QF2/3X   QF3/4x  KERN  QF5X
Indicated by the letter X, meaning that on the backside there might be the presence of limited sapwood, but not necessarily on all the boards. In the lower grades, a trace of closed heartwood is accepted. 

According to the widths and the sorting programme, we also have sorting variants. Here is a table for informational purposes that summarises the majority of the options you will find on the market and their correspondences.