Key SP Design Value Transition Concepts in One Location
Originally published by: SBCA — January 30, 2012
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The Southern Pine Inspection Bureau (SPIB) Board of Governors has issued Supplement #9, which can be view by clicking the pdf link below.
From SBCA's point of view, the changes contained in Supplement #9 can be implemented in the following ways:
1. Everyone can use the current Southern Pine (SP) Design Values in designs at the present time per the ALSC January 11, 2012 ruling and the SPIB Supplement #9, including their use for truss shop drawings that are submitted and approved before June 1, 2012.
2. On June 1, 2012 all load carrying member designs should utilize the new SP No. 2 Design Values for all structural end use applications.
3. Each company should evaluate their use of Southern Pine No. 2 to think through their individual company’s transition to the new SP No. 2 Design Values between now and the June 1, 2012 effective date.
SBCA continues to believe that all component manufacturers can and should continue to purchase and use SP as they have in the past while working through all the business considerations with respect to a prudent transition or lumber substitution plan.
The design values that currently apply to the grades of SP can be confirmed at one of the following websites:
· American Wood Council (AWC): http://www.awc.org/calculators/span/calc/timbercalcstyle.asp
· Perform a calculation using SP to see what design values are being used to resist loads currently.
· Southern Forest Products Association (SFPA): http://www.southernpine.com/using-southern-pine_design-values.asp
These lumber industry experts reference the current SP design values for engineering end uses.
SBCA will issue additional bulletins in the near future, setting forth discussion points and further recommendations for truss and component manufacturers directly relating to the current changes and future potential changes to the design values of Southern Pine. All updated information on this issue is posted on SBCA's lumber website: www.sbcindustry.com/lumber.php.