Pressure treated wood ratings (pole barns)

[EddieWalker]

Morton laminates there 6x6 out of 3- 2x6's claiming a 2x6 gets full penetration of the preservative where a 6x6 will have an untreated core. theres also a company the makes a sleeve to set the post into.

I do a fair amount of work with treated 6x6's and have never found one that was not treated all the way through. I guess it's possible, or maybe it's just that I'm lucky where I live, or maybe those who claim 6x6's are not treated all the way through are mistaken.

From what I understand about using 2x6s instead of solid posts, it's for speed in assembly. One isn't better then the other, but it's a lot harder to find a 2x6 rated for ground penetration then a 6x6. I also think a 6x6 looks better, and since most of what I build are decks, appearance very important to my clients.