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I set the Simpson post mount's floor a half inch above the concrete. The pressure treated uncut end of the post sits on the galvanized platform of the mount and is never sitting in ponding water. I expect posts set like this to last longer than me. I've done fence posts (with cheap PT 4x4) the same way and they're pretty much a forever post. I poke a few 2' junk steel rods or heavy wire down into the wet concrete too
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