Did you line the columns or just drill holes and fill them with concrete?
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belivie you didn't go deep enough even at 48'.....
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Whats the frost depth there?
I think the holes need (A) to be conical ( wider at the foot) and (B) do not let a collar of concrete mushroom out the top of the hole, keep it below grade.
Or, (C) skip the concrete and dry fill with gravel.
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I had the same problem with 6x6 PT posts in northwestern MA. Not my install but mine to fix. Posts went down over 5ft but they still heaved. Nothing but clay soil and an extremely high water table. Water infiltrated the post, froze, creating a binder between the post and the soil. The whole mess lifted.
Used these; http://www.foottube.com/index.htm all plastic so the ground water doesn't come in contact with the cement. Been 2 years and all is well, so far.
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Sphere, VTNorm, and redeyefly (?) are pointing you in the right direction.
Three things are required for a frost heave. Suitable soil, moisture, and freezing temps. Eliminate one and no heave.
What may be happening there is while the bottom of the footing could be deep enough, the soil may be sticking (freezing) to the side of the pier and ratcheting it up out of the ground with each freeze/thaw cycle.
I have heard of wrapping piers, but I have not tried it. You can also backfill them with a clean non-plastic (sandy) fill and make sure there is good drainage. Anything to keep the soil from freezing to the pier and then expanding.
Edited 1/3/2008 7:55 pm by Catskinner
What shape is your 'pier'? Is it connected to a footing?
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Thanks all, I think i'll try the footing tube, if the owner still wants to redo.
Flared footing, such as footing tube, 1½ times the frost depth. Smooth sided columns (such as formed by plastic drain pipe, left in place below ground level).
Clay is the culprit. It squeezes things out. 48" should be plenty unless you are above the 60th parallel. You need to isolate the sonatube from the clay. I think you could dig around 10" and down 36", fill with good sandy gravel and be fine.
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you can also pour your footings and insert rebar with a bend in it and then tie the rebar to your post. The frost would have to lift the area of the footing this way. I think that making the post slippery by putting a wrap of 6 mil poly around it before backfilling would be the easiest.
Don't bury your posts. Pour a concrete pier and anchor your post to it above ground.
I agree. The weather where he is simply not cold enough for long enough to freeze the soil to a depth to cause the heave by itself. Clay soils and too much water .
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Oregon? are you dealing with bentonite in the soil?