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Grain slope in wood beams

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What are the limiting requirements on allowable grain
slope in wood beams?  Are there strength reduction
factors to account for excessive grain slope, or is it
a fixed limit without exception.

FWIW, I am reporting on a 3x12 Ekki beam (Fb = 3750)
that cracked right along the grain line at
approximately 1:4.  The original specifier set a limit
of 1:10.

Jim Wilson, PE
Stroudbsurg, PA

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