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Old 06-19-2012, 07:04 AM   #1
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building on concrete piers


Replacing a Lakefront cabin in an area subjected to flooding in th spring. Current cabin elavated using PT posts.Canadian winters and high water table.Not sure how deep the posts are in the ground but they seem stable enough. Will start from square1 with new const. Would like to go above ground level 5 ft.with concrete piers. Will I need to go below the frost line?

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Old 06-19-2012, 07:16 AM   #2
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building on concrete piers


Absolutely!

All posts and piers must extend below the frost line or heaving and shifting will occur-

Check with the local building department,if this area has one--or chat with a local architect or engineer

Even the local concrete company will know the footing/pier size and depth for that area.

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Old 06-19-2012, 07:17 AM   #3
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building on concrete piers


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Originally Posted by jojocunuck View Post
Replacing a Lakefront cabin in an area subjected to flooding in th spring. Current cabin elavated using PT posts.Canadian winters and high water table.Not sure how deep the posts are in the ground but they seem stable enough. Will start from square1 with new const. Would like to go above ground level 5 ft.with concrete piers. Will I need to go below the frost line?
You always want to go under the frost line. Here in Maine foundations/sono tubes go down 4' with a footer under that.
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Old 06-19-2012, 07:50 AM   #4
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building on concrete piers


Don't bury the posts--they will rot---use a concrete pier---with post anchors embedded into the wet concrete---
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Old 06-19-2012, 08:45 AM   #5
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building on concrete piers


The frostline in Canada, at least where I live is 4ft. below. Most footings are placed below the frost line with the concrete pier on top. You can direct-sink the post into the concrete as long as the top of the pier is at least an inch above the finished grade and slopes away from the post, to avoid water buildup.

Heavy objects like street lights often have an 8-10 ft. depth for the concrete pier and have horizontal and vertical rebar in the footing and pier. You may want to consult an engineer to see if rebar is necessary. Alternatively, go in and talk to your local building department and they will tell you the requirements for the footing and the rebar, and whether an engineer's stamp is required for the drawings.

Hope this helps
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