Cm with reduced values for pressure treated wood? 1

[SLTA]

Hi folks,

I'm using iLevel's "Parallam Plus" beams for an exterior deck, and they provide reduced allowable design stresses to be used due to the pressure treating. Do I also need to apply the Cm factor? Seems to me that's like double dipping. I've tried calling iLevel but apparently they're really short staffed and aren't able to take calls...

 

[SLTA]

never fails - iLevel just called back. so, no, you don't use Cm with their already reduced values.

 

[woodman88]

Per their attached pdf. A free download from

http://www.woodbywy.com/exterior/e_ParallamPlusPSL.aspx

"The allowable design stresses take into account the effects of treating and end-use moisture content (MC)."

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.