Finger-Jointing Kiln-Dried and Unseasoned White Spruce Lumber Using the ”WFPL” Method

Finger-joints were prepared from the different combinations of rough 2- by 12-inch, kiln-dried and unseasoned white spruce lumber, using a preheating method developed at the Western Laboratory of Forintek Canada Corp. Forty-eight 2- by 6-inch bending-test specimens were prepared from the fingerjointed material and conditioned to 15 percent MC. In general, for a wide range of lumber MC, the average precent wood failure and strength values were high, 87 percent and 5,110 psi, respectively, indicating good adhesion between the glue and wood. These results show that the “WFPL method” of finger-jointing lumber has a high tolerance to variability in MC.

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