Visual stress grades of dahurian larch lumber

Allowable properties for dahurian larch (Larix dahurica) lumber from the Russian Far East were estimated. Although sample limitations prevented exact adherence to current U.S. standards, analyses were made in the spirit of a protocol accepted by the Board of Review of the American Lumber Standard Committee. For the four structural light framing grades contained in the National Grading Rule, modulus of elasticity (MOE) and bending allowable properties of dahurian larch were higher than that of Douglas Fir-Larch, compression parallel to grain and shear were about the same as that of Spruce-Pine-Fir South, and tension and compression perpendicular to grain were more like Hem-Fir. Because of the sampling limitations, a more conservative analysis was then performed. By this analysis, MOE of dahurian larch was still somewhat higher than that of Douglas Fir-Larch, but bending, tensile, and compressive allowable properties were more similar to those of Spruce-Pine-Fir South. We suspect that a more complete evaluation would yield results intermediate to those of these two analyses, showing that the properties of dahurian larch are not very different from those of Douglas Fir-Larch.

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