Trying to tie seperately poured slabs together

[bhd]

I have a patio off my garage, where the previous owner poured an add on, without a footer! Erosion etc is already effecting this, to the tune of about .5" sloping of the add on end to end, after ~5 years.

My question is, it is possible to digg a footer, and use rebar, to encase the entire thing, creating a more stable, better poured, more attractive patio area?

Thoughts? insight?

I'll be posting up my garage thread as soon as i finish!~

 

[koditten]

You just need to pin the 2 slabs together. You will need a hammer drill to drill into the side of the existing slab. Install some rebar pins. Form up your new foundation/slab and pour the concrete. Done all the time.

 

[EOC_Jason]

Yes you can drill into the existing concrete and epoxy in rebar to tie the two together.

 

[csp]

Kinda hard to epoxy and rebar two existing slabs together.

The OP wants to know about pouring another slab around/below them (footer was mentioned) to keep the existing two from moving.

If both of the existing slabs are drilled/pinned with rebar that extends into your new footer it will keep them both from moving, provide the footing doesn't move.

 

[willymakeit]

It is possible.
Do you want to raise the 1/2'' ? If you want it raised then concrete jacking will be needed.
If your trying to stablize, you can do short runs of footings or peirs with a grade beam.
A lot depends on your soil conditions and frost depth.

 

[EOC_Jason]

Kinda hard to epoxy and rebar two existing slabs together.

No, not both... You drill the hold for the rebar in the existing slab. They have an epoxy that you put in there BEFORE you insert the rebar. That way you ensure you have a tight bond into the existing slab and the piece of rebar.

It's not necessary but it's cheap insurance. I've seen people not do that and have a gap form between the two.

 

[csp]

The point was that the OP has two adjacent, existing slabs(patio poured next to garage slab). You can't epoxy rebar to two existing slabs that are already sitting side by side.

I'm acutely aware that when you're pouring a new[/b] slab that you epoxy pins in the existing slab to tie the two together. That isn't the case here.

 

[EOC_Jason]

My bad, I misread the OP....

 

[zombies-nyc]

If you're trying to lift the concrete pad try something like this.