Slab Foundation Repair
Underpinning and stabilisation for settling concrete slabs, the dominant foundation type in post-1960s Tallahassee homes
Repair Type
Helical and Push Pier Underpinning in Tallahassee
Deep steel pier systems that transfer house loads past the moving soil to competent bearing strata.
Underpinning is what people usually mean when they say foundation repair. The principle is simple: the soil directly under the footing has stopped doing its job, so the load gets carried past it on steel to a layer that can hold it. Two systems dominate. Push piers are hydraulically driven straight down using the weight of the house itself as the reaction, which makes them well suited to heavier structures. Helical piers are screwed into the ground like a giant auger to a measured installation torque, which correlates with capacity, and they work on lighter structures where a push pier would have nothing to push against. Both are permanent, both are installed from outside the house, and both come with a manufacturer warranty on the steel. Pier work in Leon County typically runs $1,400 to $2,600 per pier installed.
What the scope covers
- Soil and load assessment first, so the choice between push and helical is engineered rather than habitual
- Galvanised steel shafts with documented capacity ratings, not fabricated substitutes
- Push piers hydraulically advanced to refusal, with the driving pressure logged pier by pier
- Helical piers torqued to a target value that correlates with the capacity the design calls for
- Footing brackets set on sound concrete, with footing repair first where the edge has deteriorated
- Depth recorded at every pier, so the finished job is documented rather than described
- Manufacturer warranty on the pier system, transferable to a future owner of the property
Where you are changes the answer
Leon County spans three geologic provinces, and the ground under a house on the north side of Tallahassee is not the ground under a house on the south side. The Red Hills clay guide covers the northern half, the karst plain guide covers the southern half, and the main Tallahassee guide puts the whole picture together.
Pier Systems anywhere in the county
Someone comes out, takes the elevations, and writes you a price. It costs nothing, and the ground conditions for your specific area are covered on its own page.
Detail
Questions about pier systems
What does underpinning cost per pier in Tallahassee?
Installed cost typically runs $1,400 to $2,600 per pier, and pier spacing is usually five to eight feet along the affected footing. That puts a ten-pier job in the $14,000 to $26,000 range. Depth is the main swing factor: where competent bearing sits at fifteen feet the pier is cheap, and where it sits at thirty-five feet the same pier costs considerably more. Quotes that price per pier and state an assumed depth are the ones you can compare.
Helical or push piers, which does my house need?
It depends on the weight of the structure and the soil profile. Push piers use the building as the reaction mass, so they need a heavy enough structure to drive against; they suit two-storey masonry well. Helical piers generate capacity from torque rather than building weight, so they work under lighter structures, additions, porches, and stoops where a push pier would simply lift the house instead of advancing. On many jobs either would work and the choice comes down to the soil profile and the installer's judgement.
How deep do piers go around Tallahassee?
It varies with where you are in the county, which is unusually true here. North of the Cody Scarp the Red Hills soils are deep clay and sandy clay, and piers may need to reach well down before finding a layer with reliable capacity. South of the scarp in the Woodville Karst Plain, thin sandy soil sits over limestone and refusal can come much shallower. Neither situation is better or worse; they just produce very different pier lengths and very different prices, which is why a quote written without a soil assessment is a guess.
Does underpinning come with a warranty?
The steel pier systems from established manufacturers carry a product warranty, commonly written as a lifetime warranty on the pier and transferable to a subsequent owner of the property. That is distinct from the installing contractor's workmanship warranty, which is typically shorter and covers the installation rather than the hardware. Both belong in the written quote, and it is worth reading which one covers what.
Will underpinning close the cracks in my walls?
Partially, often. When piers take the load and the footing recovers some elevation, cracks above frequently narrow, and some close nearly completely. How much depends on how long the movement went on and how the structure has adjusted around it. The purpose of underpinning is to stop the movement; crack recovery is a welcome side effect rather than the deliverable, and cosmetic repair afterwards is normally a separate line.
Adjacent Work
What usually gets quoted alongside it
Foundation problems rarely arrive alone, because they usually share a cause. A house that needs piers on one side very often needs the drainage on that side corrected too, and the second job is what stops the first one repeating.
-
-
Pier and Beam Foundation Repair
Shimming, sistering, and pier rebuilds for the raised crawl space homes in Tallahassee's older neighbourhoods
-
Foundation Crack Repair
Sealing and structural stitching for cracks in slabs, stem walls, and masonry foundation walls
-
Concrete Leveling and Slab Lifting
Polyurethane foam and mudjacking to raise sunken driveways, walkways, patios, and garage slabs
More on ground conditions around Tallahassee
Find out what is moving under your house
Someone comes out, takes the elevations, walks the drainage, and writes you a price. Ring (850) 391-4290 or send the details through the form.