I'm building an attached deck and have already buried precast piers in the ground. Unfortunately, I had to dig so deep that the tops of the piers are below finished ground level. I'd rather not bury the 6×6 posts. The tops of the piers are 8"x8". Should I use sonotubes and pour concrete on top of the piers (assuming I can jury rig round sonotubes on top of a square pier top) to bring the piers above ground level? How about putting a post sleeve around the post to keep it away from the soil? I know metal and today's PT lumber aren't friendly with each other, so could I use plastic sleeves?
Putting PT Piers in Ground
deck
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Best Answer
Without seeing the plans and what kind of precast piers you have - I would say that I'd pour more concrete, with some rebar drilled and epoxied into the precast piers and the new concrete poured over to join them both.
Then set stand-off post bases into the new concrete for the PT posts.