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Green pressure treated lumber was mostly for termite prevention, brown PT is supposed to prevent some contact decay, but if you really want to stop rot, it needs to be kept dry all the time. Can't use chemicals that really work, the EPA would have a hemorrhage.
In the last bunch of years I have taken to painting my posts with Henry's roof patch to surface level and putting sand/gravel in the bottom of the post hole with the post touching that. Havent had any rot since.
Oh and I try to re use the concrete hole filler after removing the old post fluff.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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