Here in Reno the bottom dry rots or is insect damaged after about 4 years. I found painting the bottom in roofing cement allows even a dry hole dirt set to survive. 10 years so far on some I did this way even re using the existing concrete. My new favourite is concrete filled 2" galvanized water pipes
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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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