Soil Erosion under Patio, Garage, etc.

Member since 2019 · 44 posts · 5 votes

I've noticed that some of the soil is starting to wash out from underneath my patio slab. Obviously, my concern is that if this continues, the slab will settle and crack. How can I improve its support, seal it and prevent further erosion?

SECOND ISSUE, check out the last two pics and tell me your thoughts - is this soil erosion, or snake holes?

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Cara Kennedy
Rental Property Investor · Member since 2019 · 189 posts · 62 votes
7y
Hey @Matthew Defore, firstly, I make no professional claims that this information will fix the issue without having seen it myself. I can't get the picture in view in mobile, but if you have soil "erosion" under a patio slab you're likely looking at soil transport instead (soil getting moved by water). The big question needs to be: where is the soil going (i.e. what route is it taking)? And checking that you don't have any water issues in the basement or dirt inflow into your sewer should be high priorities. These are two commonly culprits, especially depending on the pipe material and age of the sewer.
As for a fix, make sure the water/soil isnt causing damage elsewhere and then there are products that can lift the patio stone using a flowable polymer to fix it. Consult with a local geotech engineer who can customize your solution to your exact problem. A company I've seen do the polymer infill/lifting is Uretek. Not sure on their service area, but they're a place to start. I haven't researched whether any good DIY techniques can do the same job. Good luck!
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Matthew Defore
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Member since 2019 · 44 posts · 5 votes
7y
Thanks @cara kennedy! Has anyone looked at the other pics to give an opinion if it's snake holes?
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