High-Temperature Drying Effect on the Bending Strength of Spruce-Pine-Fir Joists

Data from static bending tests of full-dimension eastern spruce, jack pine and balsam fir joists dried with high-temperature and conventional kiln schedules were analyzed. Linear regressions relating dry MOR to green MOE established that a statistically significant reduction resulted from the use of high temperatures. For a mixture containing equal volumes of the three species and mill-run proportions of Select Structural and No. 1 grades, average bending strength was reduced by 11.7 percent. On an individual-species basis, jack pine suffered most with statistically significant reductions of 2.2 percent in MOE and 13.5 percent in MOR. Both spruce and fir had non-significant reductions of 1.1 percent in MOE and significant reductions in MOR–11.0 percent in spruce and 10.2 percent in fir.

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