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Old 11-14-2017, 01:56 PM  
nealtw
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Originally Posted by billshack View Post
i think this might be O K in the usa, but here in canada where the frost goes to six feet or more , one year it went to 8 , i would not try it , also if you are a contractor until this stuff is accepted by the canadian building code you are leaving yourself open to lawsuits.
Bill
Canada is a big place, our depth is 18"


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Old 11-14-2017, 02:22 PM  
mabloodhound
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Those are only approved for decks, porch or small outbuildings. Not acceptable for whole house foundations.

Dave Mason


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Old 11-14-2017, 02:55 PM  
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They are not acceptable for use on a deck that is attached to a permanent structure(home).

The permanent structure is isolated from frost heaving, but the outer support of th deck cannot allowed to heave upward. - They don't always come back down.

Dick

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Old 11-14-2017, 03:23 PM  
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They are not acceptable for use on a deck that is attached to a permanent structure(home).

Dick
The Home show referenced did have the porch and roof attached to the house and only the outside footings were replaced.
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Old 11-14-2017, 04:04 PM  
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They are not acceptable for use on a deck that is attached to a permanent structure(home).

The permanent structure is isolated from frost heaving, but the outer support of th deck cannot allowed to heave upward. - They don't always come back down.

Dick
This sounds more like regular deck blocks than the product used on This Old House. They used them for the front porch and the posts were supporting the roof over the porch.
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Old 11-14-2017, 05:33 PM  
nealtw
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This sounds more like regular deck blocks than the product used on This Old House. They used them for the front porch and the posts were supporting the roof over the porch.
I would like to see how they work. If you have added pipes to or below the frost level. That will leave the lump of concrete and 90% of the pipe is still exposed. The holding power of that bottom bit is more than frost heave.


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