Posted by MarkB_MI on August 02, 2013 at 04:01:22 from (75.219.6.57):
In Reply to: Re: Wood preservative posted by Stan in Oly, WA on August 02, 2013 at 02:15:28:
Hah! Been there.
Stan, I've seen the equipment used to pressure treat lumber and it's pretty impressive. I'm told they load the lumber into a large pressure vessel, then evacuate it. Once they've pulled a good vacuum, they then flood the vessel with the solution and pressurize it. Since the air has been sucked out of the wood, the solution is sucked deep into into it. So "properly" treated wood should have preservative all the way through it.
That said, a few years ago I bought a some 4x4s at a local store whose name rhymes with "loan repo". When I trimmed them to length, it was apparent that the PT solution had not fully penetrated the wood. The posts have held up OK, but rot is not a real big problem here.
You used to be able to by copper naphthenate at the hardware store, but that went away when they outlawed CCA. Anything to seal the end grain will reduce rot and checking. Boards tend to rot from the end grain because rot fungus is drawn into wood anytime it absorbs water, and water migrates fastest through the end grain.
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