![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfa0CMVrTzt3IJ99g7bub-cvTdjcgNp1IMpejmeHpiMqRu2DWi82MtUxpQk7sKT4a3o4SxPccL_1pStbvG0KeUTH2mi1XCa0PexApQrjqhl9SQ_jw9vYJm4VxdKER3aj0w2tuLBg/s320/fence-lifting-out-of-ground.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQe3pirzO7uXQVcxTxQ2biZ3Bv6HW3fcywbI5srFXt3OhMlfs9InZvD2_L75Hj_k6JkT6fQX5lRo8vjjKbhD9c9-SPQ5nh96s_nFM5wmPF-LrxLdmLmstmfs20lfRv_JEMuEVvDw/s320/fence-falling-down.jpg)
Why do fence posts lift? Here’s an illustration.
Too much concrete… if the concrete is at the top of the hole, it is shaped in a perfect way for frost to lift it out of the ground at a rate of nearly an inch per year in some cases.
Realistically it doesn’t matter whether the concrete is in the ground 32” or 42”, when you dig a hole the top of the hole is normally larger. Frost sets in from ground level downwards and moisture expands as it freezes—therefore the ground rises.
Solution: KEEP THE CONCRETE IN THE BOTTOM PART OF THE HOLE ONLY!
Too much concrete… if the concrete is at the top of the hole, it is shaped in a perfect way for frost to lift it out of the ground at a rate of nearly an inch per year in some cases.
Realistically it doesn’t matter whether the concrete is in the ground 32” or 42”, when you dig a hole the top of the hole is normally larger. Frost sets in from ground level downwards and moisture expands as it freezes—therefore the ground rises.
Solution: KEEP THE CONCRETE IN THE BOTTOM PART OF THE HOLE ONLY!
Are you ready for the irony? Yes... this fence is surrounding a Municipal Services Yard -- in a township north of Toronto. Municipal services take care of things like fence repairs etc.
If anyone should know better--It is them.
L
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