SBCA Analyzes New SP Design Value Recommendations

Originally published by: SBCASeptember 19, 2012

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Now that the ​Southern Pine Inspection Bureau (SPIB) has concluded their full matrix In-Grade Southern Pine (SP) testing, and has issued its recommendations to the American Lumber Standards Committee’s (ALSC) Board of Review (which can be viewed by clicking on the pdf link below), SBCA is in the process of analyzing the proposed design values and will provide updated span tables and substitution charts comparing the old (Pre-June 2012) SP values to the new, preliminary (Fall 2012) values.


As reported earlier, the SPIB Board of Governor's met in Atlanta, Georgia on August 30, 2012. There they discussed the findings of the SPIB Technical Committee regarding the full In-Grade SP test results, and approved recommendations to submit to the ALSC's Board of Review for approval.

In preparation for its October 18th Board of Review meeting, ALSC provided SBCA a copy of SPIB’s recommendations. In its introduction, SPIB stated:

Based on the results of seventeen years of this [ASTM D1990] monitoring program, the SPIB realized the time had come to perform a full-matrix reassessment of the design values for Southern Pine dimension lumber. This report documents the results of the recent (2010-2012) tests on visually graded Southern Pine dimension lumber and establishes new design values based on these recent tests.

The report details the methodology and results of the full matrix testing and includes SPIB’s recommended changes to SP design values.  As we reported in July, here is a brief analysis of how these new recommendations differ from the existing design values.

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