Look into post protectors. I have a 30 x 60 built by mitchell...They used treated posts with post protectors. The protectors are at least 1/8" plastic covering that goes up the post, they trimmed the protectors down to height right before the concrete was poured. I believed the posts are guaranteed over 25 years. The protectors are like a plastic sleeve that fits snugly on the post in the ground.
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