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1
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RFreund
Structural
- Aug 14, 2010
- 1,885
This may be old news to some, but new to me.
At a woodworks seminar today I learned that 'emergency' testing on southern pine wood has lead to the conclusion that there should be an immediate strength reduction for 2x4 SoPine due to more juvenile wood used in production.
Apparently the strength of a 2x4 SP will be reduced on 6/1/12. The official letter also 'strongly urges' to use caution when using other sizes as well as they may be reduced 25-30%
I imagine this being a real sh** sandwich for some design engineers, especially truss designers. I mean in a repetitive system it may not be so worry some, but for a 60' truss where one web member failing can cause a collapse, what are you to do uptil 6/1/12? It seems the grading or standard agency has put people in a tough place. They issue a statement saying values will be reduced for one size at a future date due to the fact they are currently understrength and future testing is needed for other sizes but they are also believed to be understrength.
I see this being tough for 'cut throat' truss engineers who will design with this knowledge in advance of 6/1/12, who won't?
EIT
At a woodworks seminar today I learned that 'emergency' testing on southern pine wood has lead to the conclusion that there should be an immediate strength reduction for 2x4 SoPine due to more juvenile wood used in production.
Apparently the strength of a 2x4 SP will be reduced on 6/1/12. The official letter also 'strongly urges' to use caution when using other sizes as well as they may be reduced 25-30%
I imagine this being a real sh** sandwich for some design engineers, especially truss designers. I mean in a repetitive system it may not be so worry some, but for a 60' truss where one web member failing can cause a collapse, what are you to do uptil 6/1/12? It seems the grading or standard agency has put people in a tough place. They issue a statement saying values will be reduced for one size at a future date due to the fact they are currently understrength and future testing is needed for other sizes but they are also believed to be understrength.
I see this being tough for 'cut throat' truss engineers who will design with this knowledge in advance of 6/1/12, who won't?
EIT