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How deep do footings have to be to prevent frost heave?

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Posted by: from Madoc
4/19/2016 at 7:16:14 PM

I want to hold up my water tower with sonotubes and concrete post anchors. Is 4 foot of 6" wide tube per post sufficient? (Posts are 6x6s).

How deep do footings have to be to prevent frost heave?
REPLIES (4)
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Date/Time4/19/2016 at 11:07:21 PM

Frost can go up to 6 ft into the ground. So to be on the safe side that is how deep your footing should go, especially with something as important as that.

Also make sure the way you anchor your posts to the concrete is strong.

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Date/Time4/19/2016 at 11:58:22 PM

Some areas have no frost, like coastal Vancouver island and only require the soil be suitable bearing. Other areas can be up to 6 feet. Other locations still you can build right on permafrost just a mere 6" below the topsoil.

Check with your local municipalities building department to get accurate information.

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Andrew from Hydroshield in Brampton
Date/Time4/20/2016 at 8:21:48 AM

Frost depth varies. Toronto is 48" but Madoff may be more, call your local municipal building department and they can tell you. I would install larger sonotubes with flared bottom section for increased bearing capacity. Water is very heavy and the 6 " tube may be undersized.

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James from Deckster Decks in Scarborough
Date/Time4/22/2016 at 6:04:09 AM

Contact a thermal pile company to install footings. Goliath or Postech have excellent products. Each pile can support 9000lbs

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