Tuesday, October 16, 2007

Incredible Growing Fences



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!
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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