Bending Strength of Lodgepole Pine Lumber Increases After Edge-Gluing

Narrow pieces of lumber were edge-glued in order to achieve increased strength while making greater widths. Edge-glued 2- by 10-inch lodgepole pine specimens fabricated from 4- and 6-inch widths had bending strengths equivalent to material one grade higher when compared to control (not glued) pieces; 2 x 10’s increased from grade No. 2 structural joists and planks to grade No. 1, and from No. 3 to No.2. Specimens with-the best edge (based on knots and slope of grain) oriented outward were slightly stronger than pieces edge-glued in random manner, but both types of specimens increased in strength one grade. Similar increases would be expected with other species provided slope-of-grain was limited to 1:8.

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