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10-09-2012, 10:44 AM
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Quote:
Originally Posted by jjmartin1340
"Is the frost line in your area deeper than 4'?"
This is Keswick, ON, Canada (north of Toronto).
Water pipes, etc must be 4 feet deep, so I assume the frost line is maybe 3 feet deep, probably less now with the warmer winters. The fence in the pictures is a couple of blocks away from me, don't know anything about it. I've been going for walks around the area for 5 years now. The fence was there when I started. It never heaved up until this spring, which is also the warmest winter in ages. Instead of -25C to -35C at night in February, we only had a few nights at -20C, and in March there were many days above 0C with nights -10c.
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Thanks for your answer.
At my latitude/longitude the outside design temp is -10C/+14F so it maybe gets colder than that 1% or 5% of the time.
I imagine these kinds of temps can be dangerous if you are not acclimated.
Your freezing and thawing seems somehow to have compacted the soil more than it was when the fence was installed.
Last edited by Wuzzat?; 10-09-2012 at 11:03 AM.
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10-09-2012, 06:23 PM
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If your pipes are at 48" the fence wants to be a 48".
The fence coming out of the ground on a warmer winter will have more to do with the amount of water just below the concrete as compared to other years, warmer may have been wetter.
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10-11-2012, 02:52 AM
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I think so, the concrete not deep enough
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10-11-2012, 08:11 AM
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Assuming the posts were vertical when first installed, I'd think:
-if the soil surface is sinking because of compaction the posts will still be vertical.
-if the posts are being pushed up they should be becoming crooked, like old tombstones.
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10-12-2012, 02:54 PM
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This seems to be getting a lot of interest. Here's 2 pics of the fence. It's becoming rather crooked from the post heaving.
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10-12-2012, 03:05 PM
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So the red fence was planted deeper.
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10-13-2012, 01:11 PM
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This has been an interesing thread, I just realized that the guy who used Sonotube has no problem with his fence but the guy who didn't has problems and yet everyone is picking on the guys who's fence is still good. Am I nuts here or??? Really not trying to make trouble here just not making sence to me
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10-14-2012, 11:38 PM
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Like Blue Jay said; we used to just tamp the fill back in around the post. If you use a tube, you are not filling the whole hole so your back to tamping the fill back around the concrete, so why bother with the concrete?
Any way if both fences were planted at the correct depth then both would have popped for the same reason, but the red one did not.
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