SEDL / STP / STP353-EB / STP45122S

Physical Tests and Statistics for Improved Lumber Stress Grading

Senft, J. F.
Instructor in forestry, Purdue University, Lafayette, Ind

Suddarth, S. K.
Professor of forestry, Purdue University, Lafayette, Ind

Angleton, H. D.
Director, National Association of Home Builders Research Laboratory, Washington, D. C.

Pages: 7    Published: Jan 1964

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Abstract

Strength tests have shown that the current visual grading system produces highly variable results. New nondestructive methods of stress grading have been found to be more efficient and have been introduced into commercial practice.

The statistical system is geared to automation and eliminates human judgment. It is also flexible to meet other future needs. Each piece is given a stiffness ratio; new wood species can be marketed for structural lumber; and higher strength material can be separated out for special uses.