Strength classes for constructional timber and lumber

The chart shows some of the common strength classes in Europe (EN14080/EN14081).

Classes in strength grading
Strength classes

Strength grading of constructional timber and lumber is required to ensure that the wood complies with the correct standards and strength requirements. Machine strength grading with Dynagrade and Precigrader can be done in accordance with most timber standards: the EN-classes in Europe, MSR-classes in North America, MGP-classes in Australia and JAS-classes in Japan.


Denmark, Norway & Sweden

Finland, Estonia, Latvia, Lithuania, Poland & Russia

Great Britain & Ireland

Canada & USA

Switzerland, Germany & Austria

France & Belgium


Chile, Brazil & Argentina