Grade 1
- Allowed : all kind of knots, natural discoloration, streaks, curly grain
- Not allowed : rot, false heartwood, pith
- Two sides A
Grade 2
- Allowed : false heartwood coming on one face of a board, all kinds of knots, natural discoloration, streaks, curly grain
- Not allowed : false heartwood overrun to the second face of the board more than 30 cm, rot
- Side A/B
Side board
- Allowed: all kinds of knots, , natural discoloration, streaks, curly grain
- Not allowed : rot, false heartwood, pith