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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


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Title: Temperature adjustments increase accuracy of grade assignments

Source: USDA Forest Service, Forest Products Laboratory, Techlines, 2005

Author(s): Green David W.

Publication Year: 2005  View PDF »

Category: TechLines

Abstract: Changes in moisture content and temperature can cause large changes in the mechanical properties of wood. Historically, tests of wood properties were conducted in a laboratory un-der constant conditions of temperature and humidity. This allowed the effect of temperature to be separated from the generally greater effect of moisture content. Increasingly, however, tests are conducted in the field under ambient con-ditions. For example, bending tests are conducted in the field using portable equipment to establish allowable properties for visually graded structural lumber. Wood temperatures at time of test ranged from 0F to 90F (18C to 32C). Such test data must be corrected to room temperature to obtain meaningful results.

Keywords: lumber grading, drying, lumber, kiln drying ;

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