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Originally Posted by roger
id use 3 PT 2x6's laminated together. if strait and square is important then this will be better than twisty 6x6;s
the pressure treatment only penetrates maybe 1"-1 1/4" whereas almost the entire 2x6 would have been preserved. use copious amounts of endcut preserver as well.
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Great idea.
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A recent product I discovered is fibre reinforcement for concrete, and I think it would be excellent for keeping piles from splitting.
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Pushing rebar down the sonotube is the tried and true method.