Approximately 60% of QS2 (see description in the QS2 tab) and 40% of QS3 (description below):     

– Sound knots below 10 mm, admitted without limitation

– Sound knots between 10 and 70 mm, admitted in the equivalence of a knot less than 160 mm

– Admitted with reduction: one loose or rotten knot less than 70 mm, one isolated knot less than 30% of the width of the board, rolling, frostbite, sapwood deterioration only if isolated, lunure, brown heartwood less than 25%, rot only if isolated, sapwood pitting