Abstract:Background Douglas fir timber commands a premium for structural uses and a high proportion of mill out-turn will meet local structural standards. Old growth Douglas fir from the Pacific Northwest is world-renowned for the quality of the clear and high strength timber, and has been a major source of structural lumber and plywood as well as an important source of appearance and finishing grades domestically and for export. However, the iconic United States stands have long gone and second growth stands of Douglas fir (up to 100 years old) now dominate the market. This resource contains a much higher proportion of juvenile wood, commonly accepted as the first 20 rings from the pith in Douglas fir, and yields negligible amounts of clear lumber. (no keywords)
