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Question DetailsAsked on 8/3/2017

What is the best way to add soil under neath my cement stairs without any major excavation Of the dirt or stairs?

Small cavity of less than 1 foot wide and 1 feet deep. Can a contractor drill a hole in concrete and use a scope to see cavity and then fill mud or cement throug the same small hole?

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1 Answer


Yes it can be grouted - Concrete - Levelling/Mudjacking (which is acutally liquid grout jacking) is the Search the List category. But pricey - minimum charge probably about $250 or more.

If this is just an animal burrow or minor soil settlement void, not causing troublesome settlement of the stairs, you can just take a crushed stone or stiff slightly silty or clayey gravelly soil (NOT sand) and rod it in there as a "drypack" (actually damp), tamping tightly layer by layer with a 2x4 or piece of pipe or such, with the soil at damp but not wet consistency so it compacts well.

Ditto on the "drypacking" with stiff sackcrete mix - predampen (damp, not soaking mud) the soil in the hole, then mix sackcrete to thick consistency like a biscuit dough so it does not run or slump much but still is moist enough to pack in well - rod it in with 2x2 or 2x4 or such layer by layer. You can trowel off at the opening - may need piece of wood blocked/braced againsat the opening to prevent slumping for a few hours if hoel is large at edge of steps. After it has set a few hours (so you cannot push finger into it) wet it well and either covaer with wet papers or rags to keep wet for at least 3 days, or dampen frequently with a jose, because it needs wet conditions to cure right.

These latter two you can do yourself or Handyman can do.

Answered 3 years ago by LCD

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