Organizations Update Span Tables for June 1 Deadline
Originally published by: SBCA — May 20, 2013
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Last week, two organizations released updated span table materials with the new Southern Pine (SP) design values effective June 1, 2013. The American Wood Council (AWC) indicated in a May 14th release it had revised several of its standards and design tools to, “ensure they remain consistent with the new design values.” In advance of the June 1st implementation date, AWC has developed addenda and other updates as follows:
- Addendum to NDS® Supplement: Design Values for Wood Construction, to use with 2012 NDS, 2005 NDS, and 2001 NDS;
- Addendum to Design Values for Joists and Rafters, to use with Span Tables for Joists and Rafters;
- Addendum to 2012 Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings; and
- Addendum to 2001 Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings.
In addition, the Southern Forest Products Association (SFPA) announced in a release on May 16th new pocket span cards for SP joists and rafters.
As noted last week, SBCA created sortable span tables for component manufacturers to use to compare the performance changes between the old and new SYP design values, along with all North American softwood lumber species, as well as visual and MSR/MEL grades. The table includes spans for 2x10 joists, 2x12 joists, 9 1/2” (4x2) trusses and 11 7/8” (4x2) trusses at 40 psf LL, 10 psf DL, 5 psf BC DL, 360 deflection. As you can see from the sortable results, trusses perform favorably to solid-sawn joists.