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Replacing 20x20 wooden deck with concrete slab?

Posted on 6/11/21 at 8:28 pm
Posted by boosiebadazz
Member since Feb 2008
80466 posts
Posted on 6/11/21 at 8:28 pm
We bought our house three years ago and there is a wooden deck about 20x20 in the backyard that is 20 years old and not in great shape. The termite guy told us it was just begging for an infestation.

I’ve never poured a slab and have no idea regarding cost, units of measurement or any of that.

I’m thinking concrete is poured in cubic yards but could be totally wrong on that. There is some drainage and a pergola base that will go into this and cost extra, but what am I looking at ballpark just to pour a 20 foot by 20 foot by 2 foot thick slab?

I’m decently handy, but this is beyond my scope so I’m looking for contractor prices in the lafayette area if that helps.

It’ll be abutting up to a concrete slab and brick exterior of a house on two sides and I’d like to have rebar drilled into the foundation (if that is even possible).

Thanks for any info.
This post was edited on 6/11/21 at 8:29 pm
Posted by GeauxldMember
Member since Nov 2003
4406 posts
Posted on 6/11/21 at 9:23 pm to
quote:

2 foot thick slab


You parking tanks on that sumbitch?
Posted by rented mule
Member since Sep 2005
2371 posts
Posted on 6/11/21 at 9:24 pm to
Good lord why would you want to pour a 2ft thick pad for a patio??
That's 30 yards of concrete.
This post was edited on 6/11/21 at 9:26 pm
Posted by crownNbull
Gretna
Member since Jun 2010
3096 posts
Posted on 6/11/21 at 9:46 pm to
Don’t pour a 2’ thick slab and don’t let anyone convince you to. Bring is some fill material to raise to the elevation you want. Install some subsurface draining if necessary. 20x20, 4” thick slab is about
5 cy. So you’d be looking 20-22 yards for 2’ thick plus the added steel and concrete placement
Posted by LsuFan_1955
Slidell, La
Member since Jul 2013
1781 posts
Posted on 6/11/21 at 11:09 pm to
I'm doing a 13x26 slab for my storage shed. The framing starts tomorrow, Saturday. The slab will be 4 inches thick with 8 inch footings running down the length. The quote came to $2550. I'm on the northshore.
This post was edited on 6/11/21 at 11:10 pm
Posted by AndyCBR
Baton Rouge, LA
Member since Nov 2012
7567 posts
Posted on 6/11/21 at 11:12 pm to
Concrete is very expensive fill material.

Pour a 4-6” slab with turndown footings on the perimeter.

The fill material and grading won’t be free but it will be way less than the safe foundation you are proposing.
Posted by Ric Flair
Charlotte
Member since Oct 2005
13690 posts
Posted on 6/12/21 at 12:07 am to
Why not a raised paver type of patio?

Posted by Obtuse1
Westside Bodymore Yo
Member since Sep 2016
25931 posts
Posted on 6/12/21 at 1:59 am to
You may want to consider doing stamped or imprinted then stained concrete for a patio. There are tons of options and it makes for a really nice look.



Posted by Cracker
in a box
Member since Nov 2009
17812 posts
Posted on 6/12/21 at 9:02 am to
Yeah stick to 4 in slab if you did it 2 feet thick that patio would weigh over 60k pounds ??
You will be able to build a very nice stamped stained patio a heck of a lot cheeper than building a wooden deck and it’s low maintenance
Posted by Mr Fusion
The American Dream City
Member since Dec 2010
7457 posts
Posted on 6/1/22 at 7:56 pm to
Summer 2020, in DFW, I had ~400 sf concrete patio poured for $2,500. 4" thick, #3 rebar on 18" centers, 8" footing around the outside edge. I removed an old wooden deck myself, and did the rough grading by hand.

Hopefully that gives you a good ballpark. I imagine they'd have charged an additional $500-$1000 for the deck removal, because that was probably the some of the hardest physical labor I've ever done on my own.

You also need to consider access to the patio area. Is it in an area where they could back up a concrete truck? If not, is there a gate wide enough to get a transport buggy (assume 5' wide clear path)? Otherwise, your cost will go up and quality will go down if they have to transport it by wheelbarrow loads.
Posted by Cracker
in a box
Member since Nov 2009
17812 posts
Posted on 6/9/22 at 4:44 pm to
Block two high fill with gravel pour 4 in slab on top
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