SBCA Testifies at ALSC, Raises Concerns Over 'Appendix A'
Originally published by: SBCA — January 31, 2013
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Editor's Note: The ALSC Board of Review has approved SPIB's design value changes for all size and grades of visually graded SYP, effective June 1, 2013.
Yesterday (January 30, 2013), the American Lumber Standards Committee (ALSC) Board of Review heard testimony regarding the Southern Pine Inspection Bureau’s (SPIB) recommended design value changes to all sizes of Southern Yellow Pine (SYP).
In addition to advocating for a transition period in line with the precedent ALSC established when approving SYP design value changes in January 2012, SBCA raised serious concerns regarding language SPIB recommended including in a revised Appendix A to its Supplement 13 which lists the new recommended design values for all grades and sizes of SYP.
In a letter to ALSC (which can be viewed by clicking on the first pdf link below), SBCA outlined its concerns with the new language included in Appendix A:
As expressed at the BOR meeting, we have sincere concerns over the last few sentences and would recommend the change to this appendix, as defined below, so that the BOR review process can move forward unabated. It is important for ALSC to keep moving the design value changes forward given that SPIB testing shows significant design value changes (mostly lower) that should be published and used as soon as is reasonably possible with a BOR recommended transition period. This is critical because some applications using the “old” design values could result in NDS engineering-mechanics-based equation overstress conditions.
SPIB’s proposed Appendix A reads (highlight added to emphasize contentious language referenced in the letter):
SBCA’s letter to ALSC also draws attention to the SBCA Executive Committee approved policy entitled, “Structural Building Components Industry Truss and Component Raw Material and Construction Products Design Properties Policy,” (which can be viewed by clicking on the second pdf link below). The letter states:
As SBCA has consistently stated in each of its written submissions to the BOR, and at each of the hearings held to date, all end-users, when they are purchasing lumber for their trusses, components and related conventional framing applications, are essentially and effectively purchasing lumber design values and related properties. Having consistent properties in turn creates more reliable engineered and conventional designs.
Additional information on lumber design values can be found on SBCA's lumber webpage: http://www.sbcindustry.com/lumber.php.