replacing concrete patio - footings?

Linda277June 11, 2013

I am replacing a 35 x 15 ' patio. The 35 is against the house. This time, rebar will be drilled into the foundation to stop sinking away. One contractor suggested a footing (2' deep so not below the frost line) all around to stop animals. He would tie rebar from footing to pad. The other suggested he pour the edges 12" deep and the top 4", no vertical rebar in the 12" deep sides. He said the center would heave if all 4 sides are tied to the edges. We are in Zone 4/5 depending on map. Any suggestions?

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klem1

I wouldn't attempt advising very indepth on this but have a couple of thoughts. You must contract this to somone you trust then follow their advise. If you don't have a knowledgeable friend to assist you ,inquire with the closest concrete plant for referals of contractors.
Unless you are attempting to have the patio and house floor level with oneanother,I see no reason for doweling them togeather. If you want them level,doweling alone is worthless and requires desighn by a pro. I am curious why you are repalcing the patio in the first place.

    Bookmark   June 14, 2013 at 1:20AM
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geoffrey_b

Couple of things....

A deep pour (12") is very heavy, and prone to settle and crack (even with mesh or rebar embedded).

I'd say get a good layer of class 5 limestone, compacted for a base, and pour a normal slab. You can't tie the patio to the house, the house has a frost footing.

    Bookmark   June 14, 2013 at 9:04AM
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southerncanuck

I must be missing something here. If the slab is poured on ground how can critters get under it? Underpinning might help prevent heaving of the slab but this is generally done to build an addition as is very technical and expensive.

    Bookmark   June 14, 2013 at 10:55AM
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