12x12 COVERED PATIO

[mrtbig]

I am wanting to build 12x12 covered patio on 4 inch slab that is already there. The 12x12 will be with 6x6 posts and beams and ridge with 2x6 rafters with asphalt shingles. My question is?

I was advised to cut out holes in slab to pour deeper footers for the posts. I know there is rebar in slab, how would I cut this? I don’t think concrete saw if I rented would cut the rebar. I was going to make about 14” wide and 16” deep footers. I am in Houston, Tx area so feel is deep enough.

How should I cut these out? Is size about right or change?

Thanks,
Terry

 

[Garcky]

I am wanting to build 12x12 covered patio on 4 inch slab that is already there. The 12x12 will be with 6x6 posts and beams and ridge with 2x6 rafters with asphalt shingles. My question is?

I was advised to cut out holes in slab to pour deeper footers for the posts. I know there is rebar in slab, how would I cut this? I don’t think concrete saw if I rented would cut the rebar. I was going to make about 14” wide and 16” deep footers. I am in Houston, Tx area so feel is deep enough.

How should I cut these out? Is size about right or change?

Thanks,
Terry

Consider putting your posts outside of the existing slab. That way, you can dig and pour concrete footings for them without messing with the slab. Easy peasy.

 

[mrtbig]

Consider putting your posts outside of the existing slab. That way, you can dig and pour concrete footings for them without messing with the slab. Easy peasy.

Not an option.

 

[Stuart in MN]

Assuming the slab is freestanding and not connected to your house or anything, I'd think you could just fasten the posts to the top of the slab and be done with it, no need for footings. The canopy won't be that large or that heavy, and you don't have any frost issues to worry about.

edited to add: I didn't think about that you may have additional requirements for hurricane resistance, that may be something to check with your local authorities about.

 

[bb29510]

there no weight there

 

[nadogail]

Why not drill holes in the slab and use Hilti Quick Bolts to hold the anchor plates for your posts in place?
Your wooden posts can then be stood on plastic spacers to keep them from standing in any surface water on the slab.

lots of paint on the ends of the posts to retard moisture pick up.

 

[topp64]

Segmented diamond concrete blades will cut rebar, no problem.

 

[MushCreek]

When I redid our porch in FL, they made me put footings under the posts, even though it had been standing 50 years the way it was. I dug under it from outside the slab and put rebar in and poured concrete into the space I had dug out under the edge of the slab.

 

[CraigStu]

Mush that is probably what should be done here also. A slab just sitting there only has to support a person standing on it and that weight is spread out. When you add a roof structure supported by posts, now you have the total weight of that structure concentrated into small areas of the slab. In cases where we see something added on supported by posts we, 99% of the time, see some kind of footer added to support the posts. In this case even w/ the rebar I could see a corner of the slab cracking off from the weight the post is putting right at the edge/corner. Topp64's comment about the concrete cutter blade type I think answers the question.