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Started By
Message
My patio add-on is sinking. Does foam injection leveling actually work?
Posted on 2/21/26 at 9:04 am
Posted on 2/21/26 at 9:04 am
We extended the patio about 13 years ago. It wasn’t even a big extension, but the shitty New Orleans soils have caused it to sink. It’s tied to the slab with rebar, so now it just slants downward. Makes sitting outside and enjoying the weather difficult because you’re sitting on an incline.
I’ve seen some stuff about foam leveling. They inject the stuff underneath it and it raises the panel. Does this work? Is it expensive? I’m trying to decide whether I’m better off just demolishing it and starting over (maybe with a deck).
I’ve seen some stuff about foam leveling. They inject the stuff underneath it and it raises the panel. Does this work? Is it expensive? I’m trying to decide whether I’m better off just demolishing it and starting over (maybe with a deck).
9
Posted on 2/21/26 at 9:30 am to Slippy
How much sinking are you talking? If it’s seriously to the point it’s physically making it uncomfortable to sit, foam may not help and you may need to consider either a tear down.
Posted on 2/21/26 at 9:45 am to Slippy
I did mine and it was about 2k to raise an inch or two. It’s now sunken back down two years later.
I am guessing how long it lasts depends on the cause of the subsidence.
I am guessing how long it lasts depends on the cause of the subsidence.
Posted on 2/21/26 at 11:59 am to Slippy
if you got 13 years on a thin patio slab sitting on native soil you more than got your moneys worth. Foam “can” work but it’s temporary…depends on what is under the foam
Posted on 2/21/26 at 1:49 pm to Slippy
It is used a lot in my area…it is really effective, but as others have said, it is temporary because the dirt still moves beneath it.
That said, any other method of leveling is also temporary, because it is all sitting on the same dirt.
That said, any other method of leveling is also temporary, because it is all sitting on the same dirt.
Posted on 2/22/26 at 10:51 am to Slippy
quote:
shitty New Orleans soils
There is little you can do about it. But, cousin in Greta had a badly jumbled driveway lifted and leveled with foam 10+ years ago and is still happy with the fix. NOLA area definitely has experienced people.
Before 1980 people got around the sinking-soil by spreading shell gravel dredged from Lake P. The shells were much lighter than crushed stone. It didn't cause as much sinking, formed a strong surface, was easily renewed and looked good too.
Posted on 2/22/26 at 12:47 pm to Slippy
You'd come out cheaper in the long run just tearing out the slab you now have and building a raised deck. It's not ideal since you mentioned you have a slab house, but it's better than most alternatives.
I live in Mid-City and the soil in my area is heavy clay. Several years ago one of my neighbors added to the back of his house and they drove about 2 dozen pilings about 30 ft. long into the ground before pouring the slab.
I live in Mid-City and the soil in my area is heavy clay. Several years ago one of my neighbors added to the back of his house and they drove about 2 dozen pilings about 30 ft. long into the ground before pouring the slab.
Posted on 2/23/26 at 1:51 pm to Slippy
It's a coin toss on whether your sub surface soil has achieved maximum compaction so foam might be a temporary fix.
The best fix is to go with deep foundation along the eave of the patio but don't go cheap and just use the piles called for in NO's no test pile report. I've found several issues with what Eustis (contracted geotech firm) reports.
Also, only helical piles (my recommendation) can be installed without tearing out the existing patio if you want to save it.
The best fix is to go with deep foundation along the eave of the patio but don't go cheap and just use the piles called for in NO's no test pile report. I've found several issues with what Eustis (contracted geotech firm) reports.
Also, only helical piles (my recommendation) can be installed without tearing out the existing patio if you want to save it.
Posted on 2/23/26 at 10:26 pm to junkfunky
quote:for a backyard patio slab?
helical piles
by the time you do all that OP could have broken up the old patio, put down some stone and pour another 13 year slab and probably saved money
Posted on 2/24/26 at 9:43 am to Slippy
we mudjacked our patio last summer and spoke to 3 different contractors to get quotes and information. the one who clearly knew more about what he was doing for a longer time told us that he can do foam but doesn't recommend it, said it doesn't last as long as the mud slurry mix because the foam is thicker and doesn't spread as uniformly into smaller crevices under the slab
note: this was out West, so soil types vary greatly
note: this was out West, so soil types vary greatly
Posted on 2/24/26 at 9:56 am to Slippy
I had section leveled around my pool. Started sinking again couple weeks later. They came right back out and put more foam. Haven't had a issue.
Posted on 2/24/26 at 12:21 pm to RedheadedStepchild
quote:very common. It is a trial and error procedure as to how much foam and where.
Started sinking again couple weeks later. They came right back out and put more foam.
Posted on 2/24/26 at 1:58 pm to cgrand
quote:
for a backyard patio slab?
If he doesn't expect it to ever sink again.
Little bit of tongue in cheek. quote:
by the time you do all that OP could have broken up the old patio, put down some stone and pour another 13 year slab and probably saved money
I don't concern myself with time or money, only solutions.
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