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    Author(s): A.C. Knauss; E.H. Clarke
    Date: 1959
    Source: PNW Old Series Research Notes No. 173
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (570 KB)


    This report presents the results of a study to determine the degrade—loss in volume and grade—of coast-type Douglas-fir lumber when kiln-dried and surfaced in accordance with commercial practice. The study measured (1) loss in volume due to culling and trimming of dry-surfaced lumber because of seasoning and surfacing defects, (2) reduction in grade due to seasoning and surfacing defects, and (3) reduction in grade due to incomplete manufacture or to the development of manufacturing defects. Degrade is expressed as a percentage of the green lumber volume and also as a loss in value per thousand board feet of lumber.

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    Knauss, A.C.; Clarke, E.H. 1959. Seasoning and surfacing degrade in kiln-drying Douglas-fir in western Oregon. PNW Old Series Research Notes No. 173

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