Dirt fill to raise frost line


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Old 10-10-07, 11:25 AM
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Dirt fill to raise frost line

So I am building a pole barn and I have got my post holes dug and I have begun set them. I Live in Upstate ny and my building inspector told me to go 42" to 48" to get below the frost line. I got all of my holes very close to that despite the fact that I'm sitting on a rockbed. So just for good measure I was wondering if I backfilled the entire area with a few inches of fill would that actually help the frost depth? By a few inches I mean 20 yards worth of clay/soil fill. So my calculations put that at about 10" for my 24' x'24 area. any info helps / also what is the advantage of using quickforms to pour your concrete in?
 
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Old 10-10-07, 04:20 PM
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Your building inspector would be the best person to ask, since his opinion counts.
 
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Old 10-10-07, 06:15 PM
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Better ask your inspector. I did that once on a job, and they called me on it. But I BS'ed my way out of it. You had better ask. Good Luck
 
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Old 10-10-07, 07:47 PM
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Based on my experience what you propose won't work.
The frost not only moves down but will travel sideways as well.

Here the frost averages 8 feet and can go as deep as 12 feet.
 
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Old 10-11-07, 06:11 AM
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Wow Greg! How on earth do you guys build houses up there??

budd, did the inspector not consider the rock bed an acceptable stopping point? We have a 48" pier depth requirement as well, but if you hit solid rock, the inspectors call it good since it's very common to hit solid granite during excavation.
 
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Old 10-11-07, 10:18 PM
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Well the inspector came to inspect my hole depth and told me I was all set to move on. I guess I'll just skip the fill and save a few bucks. THanks for the input.
 
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Old 10-12-07, 05:24 AM
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I never thought about it because there's nothing but sand where I live, but hitting rock probably does change things a bit.
 
 

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