worked lumber andspecial wood products . All yard lumber isclassified into one of three categories .Boards are typically 25 mm (1 in) thick and50 mm (2 in) wide or greater. Dimensionlumber is generally 50 - 100 mm (2 - 4 in)thick and 50 mm (2 in) wide or greater.Timbers are usually greater than 125 mm (5in) thick and 125 mm (5 in) wide . Table850-3 lists common yard lumber sizes andgrading . The nomenclature and sizing forthis classification system are fairly standardand are recognized by most regional gradingauthorities, although minor variationsmay occur.
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