- Width for grade Q-B A: ≥ 350 mm
- Width for grades Q-B 1, Q-B 2, Q-B 3 and Q-B 4: ≥ 250 mm
- Narrowest width:
• 120 mm, excluding sapwood, for the whole length of the board for grade Q-B A
• 100 mm, excluding sapwood, measured halfway along the board for grade Q-B 1
• 80 mm, excluding sapwood, measured halfway along the board for grade Q-B 2
• 60 mm, excluding sapwood, measured halfway along the board for grades Q-B 3 and Q-B 4