The American Lumber Standard Committee (ALSC) Thursday approved the Southern Pine Inspection Bureau's (SPIB) design value changes for all visually graded Southern Pine dimension lumber, setting June 1, 2013 as the implementation date for the new standards.

While the committee's approval of SPIB's recommended changes was expected, the new values will impact all points of the Southern pine dimension lumber supply chain, Journal of Light Construction senior editor Ted Cushman wrote earlier this month.

"The new, lower strength values will have an immediate effect for producers of engineered products such as floor and roof trusses," he wrote. "As codes adjust over time to reflect the new values, framers and deck builders will also be affected — especially if they build with pressure-treated wood, which (at least in the Eastern U.S.) is mostly Southern Pine."

On Feb. 1 the National Lumber and Building Material Dealers Association said in a release that it sought a four-month transition period for the changes. Association president Michael O'Brien said in a statement that the buffer period "will cause less disruption in the supply chain and give dealers time to plan for the change."

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