Properties of commercial OSB from three southern pine mills

The results of an evaluation of certain mechanical and physical properties of OSB from three southern pine mills are presented. Boards from one mill consisted of 50 percent southern pine and 50 percent sweetgum. Boards from the other two mills were made from 100 percent southern pine. Although boards from all three mills met the requirements of the APA performance standards for sheathing exposure 1, the test results, as expected, indicated significant differences in properties among boards from the three mills. The maximum differences in board properties among the three mills occurred in flexural stiffness and strength parallel to face orientation. The differences among the mills in these properties for boards tested in the original condition were 31 percent for modulus of elasticity (MOE) and 35 percent for modulus of rupture (MOR). The differences in boards tested after cycling were 69 percent for MOE and 62 percent for MOR.

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