280NOT09 - Moisture Content "fiber saturation...

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Moisture Content "fiber saturation point" the moisture content of wood with 100% bound water and 0% free water. Typical value for f.s.p. is about 30 percent Decreases below the FSP will increase strength properties. F.S.P. E.M.C. 0% M.C. Free Water Bound Water Wt. of Solid Wood
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Moisture Content Equilibrium Moisture Content (E.M.C.) the average moisture content the wood will assume under service conditions typically less than the fiber saturation point and greater than 5 % F.S.P. E.M.C. 0% M.C. Free Water Bound Water Wt. of Solid Wood
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Moisture Content there is an optimum M.C. for each species (typically between 7-14 percent m.c.) specification allow 19 percent maximum (some say 15%) High M.C.--- promotes warping, fungus, insects Low M.C. --- brittleness
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Stress Grading Methods Allowable Stress including an avg. factor of safety » 2.5 99% of the time the f.s. will be > 1.25 Permissible Bending Stress Permissible Shear Stress Permissible Compressive Stress (perp.) Permissible Compressive Stress (// ) Modulus of Elasticity
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Stress Grading Methods I) Visual Grading species (6 classes)
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280NOT09 - Moisture Content "fiber saturation...

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