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I'm moving a deck footing for an existing deck, the current one is in the wrong location and it's too small. What is the proper depth in Connecticut in order to ensure that it doesn't suffer from frost heaving?

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Call the local building codes office. They'll let you know. –  DA01 Oct 22 '12 at 15:20
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up vote 2 down vote accepted

You need to place the footings deeper than the frost line. Some research says the frost line in CT is around 42" so you'd do well to put the posts down 48".

The city will be able to verify this when you get your permit approved.

Count yourself lucky... In Ottawa, Ontario I had to put them down 60"... and they still heaved one year.

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That wasn't frost. That was the country moving to the right. –  Chris Cudmore Oct 22 '12 at 16:10
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I said Canada, not Japan. :-) But then, perhaps it was Quebec separating. –  Brian White Oct 22 '12 at 16:24
    
@ChrisCudmore Politically speaking? :) –  maple_shaft Oct 22 '12 at 16:38
    
here in the northeast (USA), we always go at least 48" deep. Try some pyramid concrete porch posts. They work great, rarely heave because of the shape. –  shirlock homes Oct 22 '12 at 20:51
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+1 for GET A PERMIT. –  Tester101 Oct 23 '12 at 11:30
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