The sorting grades are for wood that is not to be used as structural timber.
Our wood is sorted solely by appearance. In 1960, Swedish sorting rules became the basis for this selection.
The best class was unsorted in grades 1-4, then came the fifth and sixth. In 1994, seventh was added, and the sorting grades were then called A1-A4, B, C and D.
Sorting of sawn timber from pine and spruce (according to Gröna Bogen, 1960):
- Grade I-IV U/S, unsorted - used for e.g. flooring
- Grade V Fifth - often used for rafters
- Class VI Sixth/rejects - used e.g. as lathing
Sorting Nordic Timber (The Blue Book, 1994)
- A1-A4 U/S, unsorted - used for e.g. flooring
- B Fifth - often used for rafters
- C Sixth/rejects - used e.g. as lathing
- D Rejects - Often used for screening at construction sites