If your foundation is sinking, cracking, or pulling away from an addition, you’re probably looking at two main repair options: push piers or helical piers. At Foundation Repair by Alex, helical piers are one of our most common recommendations, especially on lighter structures, additions, decks, and homes sitting on soil that won’t reliably support push pier resistance. This page explains what helical piers are, how installation actually works, and how to tell if they’re the right fix for your house.
What a Helical Pier Actually Is
A helical pier is a steel shaft with one or more helical plates welded onto it, shaped almost like a giant screw. We drive it into the ground using hydraulic equipment until it reaches soil (or bedrock) capable of bearing real load. Once it’s at depth, we attach a bracket to your foundation footing and transfer the structure’s weight onto the pier instead of the failing soil underneath it.
The math behind this is straightforward. Each helix plate has a bearing surface, and engineers calculate the load capacity based on plate size, number of helices, and soil torque readings taken during installation. Manufacturers like Chance Foundation Solutions (a Hubbell Power Systems brand), Ram Jack, and Foundation Supportworks all publish torque to capacity correlations for their pier lines, and we log torque readings on every pier we install so there’s a real engineering record, not a guess.
Helical Piers vs. Push Piers
| Factor | Helical Piers | Push Piers |
|---|---|---|
| Installation method | Rotated (screwed) into soil | Hydraulically pushed using structure weight as resistance |
| Best suited for | Lighter structures: additions, porches, decks, some single story homes | Heavier structures where the building itself provides enough reaction force |
| Load verification | Real time torque monitoring during install | Confirmed once full structural load is transferred |
| Soil requirements | Works in a wider range of soil conditions | Needs soil with enough resistance to push against |
Neither option is universally “better.” It comes down to your structure’s weight, the soil profile under your home, and what an engineer determines during inspection. We’re not going to sell you push piers if your load doesn’t call for them, and we won’t push helical piers on a job where they’re not the stronger fit.
Signs You Might Need Helical Piers
- Cracks in drywall that run diagonally from door and window corners
- Doors and windows that stick or won’t latch properly anymore
- Visible gaps where an addition meets the original structure
- Sloping or bouncy floors
- Exterior brick cracks, especially stair step patterns in mortar joints
- A porch or deck that has pulled away from the house
Any one of these on its own doesn’t necessarily mean you need piers. Homes settle a little over time and not every crack is structural. That’s why we do a full inspection before recommending anything, including checking crawl space conditions, grading, and drainage around the foundation.
Why Soil Conditions in This Region Matter
Central North Carolina sits on Piedmont soil that’s often clay heavy and prone to expansion and contraction as moisture levels change. Clay soil swells when it’s wet and shrinks when it dries out, and that movement is a major driver of foundation settlement in this part of the state. Homes built on fill soil, or on lots that were graded and backfilled during construction, tend to see more movement than homes built on undisturbed native soil.
This is exactly the kind of condition helical piers handle well. Because installation is driven by torque readings rather than the structure’s own weight, we can reach load bearing strata even where the upper soil layers are inconsistent or previously disturbed.
How the Installation Process Works
- Inspection and evaluation. We assess the foundation, check for the extent of settlement, and determine how many piers are needed and where they go.
- Excavation. We dig down to the footing at each pier location.
- Pier installation. Using hydraulic drive equipment, we rotate the helical pier into the ground, monitoring torque continuously until it reaches the required capacity.
- Bracket attachment. A steel bracket connects the pier to the footing.
- Load transfer. Hydraulic jacks lift the structure back toward its original position, transferring weight onto the piers.
- Backfill and cleanup. We fill excavation areas and restore the site as close to its original condition as possible.
Most residential jobs take one to three days depending on the number of piers and site access. We don’t cut corners on torque documentation because that record is what proves the repair was done to spec, not just done.
What Affects Pricing
Helical pier costs vary based on pier depth, shaft diameter, number of piers required, and site accessibility. Deeper installations and larger diameter shafts cost more because they require more steel and more drive time. A crawl space job with tight access will typically run more than a basement job with open excavation. We give every customer a written, itemized quote after inspection, not a phone estimate, because guessing at pricing before we’ve seen the soil and the damage doesn’t serve you or us.
A Straight Answer From Alex
I’ve seen homeowners wait years on a small crack, hoping it stops. Sometimes it does. Often it doesn’t, and the repair gets more expensive the longer settlement continues, because you’re not just fixing the foundation anymore, you’re fixing drywall, flooring, and sometimes plumbing lines that shifted with it. If you’re seeing any of the signs above, get it looked at. An inspection costs you an hour. Ignoring a real structural issue costs a lot more than that down the road.