Only issue with wood to dirt interface is dry rot, even on pressure treated. Keep it dry, lasts 3 times as long. I paint thinned roofing tar on all my earth contact wood on the contact areas. Will advise anticipated life when it fails in another 10or so years, if I last that long.
3 large nowadays just gets you a thousand board ft of lumber, if that much, on sale, grade #3 or 4
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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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