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Hi All,

I hope everyone is doing well during this pandemic.

I'm hoping to get some advice concerning a new concrete patio I would like to have installed. We have an existing patio that has settled and cracked, and we would like to replace it with a 17' x 16' slab that would be 4" thick.

We've had one quote so far from a concrete contractor who said that he would tie the rebar of the new slab into the house foundation. I'm no pro, but the idea of drilling holes into a foundation got the hairs standing up on my neck, so I called the next concrete contractor coming out in a few weeks to give us a bid, and he said over the phone he would do likewise - tie the rebar into the foundation.

I've done some internet searches, and it seems to be a 75%-25% split with most people saying not to tie the rebar into the house, with the idea that when the new slab settles, it will add tension to the existing foundation wall and possibly cause cracks and problems down the road.

I would love your insights and advice. I'm terrified of wrecking havoc to our foundation wall. Our basement is bone-dry - we've been really fortunate in this area. Maybe I just need some reassurance!

House is a 1989 build with concrete foundation walls with tie rods inserted through the walls, if that helps give any technical information anyone needs. We are in Wisconsin - so easily 30 - 50 degree temperature difference on some days...

Cheers,

~R
 

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retired framer
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Just have them run over the fill with a plate compactor.
The real problem doesn't show up for years when the steel that is exposed between the foundation and the slab rusts and expands and blows out the concrete.
 

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No way would I ever "tie" it into the foundation!
A slab like that is going to move over the seasons, a foundation should not.
The reason your old slab failed is because is was not prepped right under it before it was pored and likely no, or not enough cuts made in the slab to allowed it to flex.
 
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I’ll try to send a pic of the six places mine was tied in and all six have popped out the surface of the patio. Concrete guy said inspector forced him to do it; wouldn’t have otherwise.
 

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Master General ReEngineer
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No way would I ever "tie" it into the foundation!
A slab like that is going to move over the seasons, a foundation should not.
The reason your old slab failed is because is was not prepped right under it before it was pored and likely no, or not enough cuts made in the slab to allowed it to flex.
Ayuh,...... Ditto,..... Slabs, 'n decks should be independent from the house,...
 

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When you do a room addition or any addition, you tie the new slab with the existing footing, 12" deep, that's the code. A patio slab or a walkway - no.
What's the difference? A room addition has a footing all around it, patio slab and walkways don't.
 
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