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GLB allowable stress

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I have an old drawing of a wood framed roof plan.  It calls for GLB 5.125 x 24 beams.  The notes said "GLB... shall be manufactured in accordance with commercial standard CS-253".  The building is circa 1970.  Anyone know how I can find out what was the allowable stress on those GLB beams?  Thanks.
 
Y i   Y a n g  P. E.
Summit Engineering Inc.
Santa Rosa, CA