Posted by FBH44 on May 11, 2015 at 08:29:54 from (64.85.217.186):
In Reply to: Treated 4 posted by shunkfarm on May 11, 2015 at 06:54:11:
Yep, I can tell you exactly. I'm a retired building inspector. The ordinary posts in stock at lumber yards, and for sure ordinary 4x4, are rated to last only a vey short time. These posts are meant for your residential decks, fence posts, planters, etc. They are not NOT rated for building structral ratings, called "Structure Critical." The building codes and the lumber manufacturer's require these amounts of chemical [ depending on which chemical it is ] to be suitable for structure critical ratings;
“NatureWood” Alkaline Copper Quaternary ACQ Minimum 0.60 pcf ACQ for Structural / Building Pole / Foundation Use
“Micro-Pro / Smart-Sense” Micronized Copper Quaternary MCQ Minimum 0.60 pcf MCQ for Structural / Building Pole / Foundation Use
“Micro-Pro / Life-Wood” Micronized Copper (tebuconazole) Azole MCA Minimum 0.23 pcf MCA for Structural / Building Pole / Foundation Use
Ordinary lumber yard poles may not have enough chemicals. Those poles might only be approved by the manufacturers for decks or fence posts, not for permanent structural building foundations.
Even though you may see a label reading "Ground Contact", unless you see this amount of chemical, you are not getting the right post.
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