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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