New Table 4G in NDS supplement on multi-species and country grade marked lumber available

A recent edition of the American Wood Council’s WoodPost featured multi-species grade stamps that require the designer to check each specie’s design values and use the lowest design value among the different species for each design property. These new multi-species grade marks are the result of certain mills producing lumber from two or more species without separating them in production. Lumber with these grade stamps could be any of the species and countries shown on the grade mark. To help designers and code officials navigate this relatively new approach to grade marking, the lumber grading agencies, working with the American Lumber Standards Committee and AWC staff, have developed a new table of design values for multi-species lumber grade marks. This new table, titled Table 4G, Reference Design Values for Multi-Species and Country Grademarked Visually Graded Dimension Lumber (2″-4″ thick), has been approved and included as an addendum to AWC’s 2018 NDS Supplement. The new Table 4G can be viewed and downloaded here.