If your Tulsa home needs foundation piering, the contractor will recommend either push piers (also called resistance piers) or helical piers. Both are engineered steel systems designed to bypass Tulsa’s unstable clay soil and transfer your home’s weight to stable bearing soil below. But they work differently, and the right choice depends on your specific situation.
How Push Piers Work
Push piers are steel tubes driven straight down through the soil using hydraulic pressure. The key: the structure’s own weight provides the resistance force that drives the pier downward. Each pier section is pushed until it reaches refusal, the depth where the pier cannot be driven further because it has hit bedrock or dense load-bearing soil.
Because the pier is driven using the building’s actual weight, every push pier is proof-tested under real load during installation. If the pier can be pushed to refusal with the building’s weight on it, it can support that weight permanently.
Installation steps: Small excavation pit at the pier location. Steel bracket attached to the foundation footing. Pier sections hydraulically driven through the bracket to refusal. Foundation lifted with synchronized hydraulic jacks. Piers locked under load. Pit backfilled.
How Helical Piers Work
Helical piers are steel shafts with one or more helical plates (like a large screw). They’re advanced into the ground using a hydraulic torque motor that rotates the pier. The helical plates pull the pier into the soil rather than pushing it.
Capacity is determined by installation torque, a known correlation between the torque required to advance the pier and the bearing capacity of the soil it’s in. When the torque reaches the target value, the pier has reached adequate bearing capacity.
Installation steps: Small excavation pit. Steel bracket attached to the footing. Helical pier screwed into soil to calculated torque. Foundation lifted with hydraulic jacks. Pier locked under load. Pit backfilled.
Key Differences for Tulsa Homeowners
Weight requirement: Push piers need the structure’s weight to drive them. Helical piers don’t. This means helical piers can be used on lighter structures (porches, additions, garages) where there isn’t enough weight for push piers.
Depth: In the Tulsa metro, push piers typically reach 15 to 30 feet to hit refusal. Helical piers typically reach 12 to 25 feet. Both go well past the active clay zone (typically the top 10 to 15 feet).
Proof testing: Push piers are inherently proof-tested during installation (if the pier reaches refusal under the building’s weight, it can hold the building). Helical piers use torque-to-capacity correlation, which is reliable but indirect.
Site access: Helical pier installation equipment tends to be more compact. In tight-access situations (narrow side yards, interior pier locations, close to existing structures), helical piers may be the only practical option.
Cost: Push piers are generally $1,000 to $1,800 per pier installed. Helical piers are typically $1,200 to $2,000 per pier. The difference reflects equipment and installation time, not quality.
Removability: Helical piers can be unscrewed and removed if needed (rare, but possible). Push piers cannot be retrieved once driven.
Which Does Your Tulsa Home Need?
Push piers are usually recommended for:
- Standard single-family homes with adequate weight
- Sites where bedrock is at a reachable depth
- Most slab foundation repairs in the Tulsa metro
- Budget-conscious projects (slightly lower per-pier cost)
Helical piers are usually recommended for:
- Lighter structures: porches, additions, detached garages
- New construction (pre-construction installation before the building is loaded)
- Tight-access locations where push pier equipment won’t fit
- Pier and beam homes where structural weight may be insufficient for push pier installation
- Sites with very deep bearing strata where multiple helical plates provide distributed support
Either works well for:
- Most residential foundations in the Tulsa metro
- House leveling projects
- Single-story and two-story homes on typical Tulsa clay
The licensed contractor determines the best option during your free inspection based on your home’s weight, foundation type, soil conditions, access, and the pattern of settlement.
What About Tulsa’s Clay Soil Specifically?
Tulsa’s expansive clay creates challenges for both pier types, but both are engineered to handle it:
The “active zone” of clay soil in the Tulsa metro extends roughly 10 to 15 feet below grade. This is the zone where seasonal moisture changes cause swelling and shrinking. Both push piers and helical piers are installed well past this depth, reaching stable soil below where the structure’s load can be permanently transferred.
One consideration specific to clay: lateral soil forces. Swelling clay can exert pressure on pier shafts as they pass through the active zone. Push pier systems with smooth, round shaft sections resist lateral forces effectively. Helical piers with larger-diameter helical plates can experience some lateral loading from swelling soil, but this is accounted for in the engineering design.
Questions to Ask Your Contractor
- Why are you recommending this pier type over the other?
- What depth do you expect to reach refusal/target torque?
- How many piers are needed and what spacing are you using?
- What warranty is included and is it transferable?
- What is the per-pier cost, and what does the total include?
A good contractor will explain their recommendation clearly and answer these questions without pressure.
Schedule your free inspection or call (918) 673-7959 to find out which pier type is right for your home.