QUALITY:
A/A
Uniform color of lamellas, both sides free of defects.
A/B
Different color on the B-side is possible. Sound knots and repaired defects are allowed on both sides. Up to 20% sapwood is permitted. Enclosed knots and resin pockets are allowed on both sides.
B/C Rustik
Possible color variation. Sapwood up to 50% of the surface is allowed. Sound knots, cracked knots, loose knots, and knot holes up to 25 mm are allowed on both sides. Pin knots and resin pockets are permitted, as well as repairs with wooden inserts or branch knots.