Grip-Tite vs Earth Contact Products Push Pier Decision
Why this matters
Push pier systems are the bread-and-butter underpinning method for slab-on-grade homes settling on consolidating fill. Grip-Tite and Earth Contact Products (ECP) are two of the largest U.S. push pier manufacturers; both publish ICC-ES evaluation reports, both sell through dealer networks, and both have engineered systems sized for residential and light-commercial loads. They are not interchangeable. Tube diameter, sleeve geometry, bracket design, and installation method differ in ways that matter to project cost, install time, and which engineer is willing to stamp the design. This article frames the decision a foundation contractor makes when choosing which line to standardize on.
The two product systems
Grip-Tite (Grip-Tite Manufacturing, Adair, IA) manufactures push pier systems centered on the SS5 (2.875 inch OD) and SS150 (3.5 inch OD) steel tube lines. ICC-ES ESR-1854 covers the Grip-Tite product line for use under the IBC and IRC. Sleeve couplings are friction-pressed swaged ends. Brackets are remote-bracket style, allowing the pier shaft to be set at a distance from the footing edge.
Earth Contact Products (ECP, Olathe, KS) manufactures the PPB-350 and PPB-288 push pier systems and a parallel helical pier line. ICC-ES ESR-2820 covers the ECP push pier products. Sleeve couplings use external sleeve over swaged tube ends. Bracket geometry includes both standard remote brackets and the patented Plate Pier system for slab and footing applications.
Both companies publish design capacity tables, installation manuals, and dealer-training programs. Both have multi-decade field-history records.
Decision 1: Engineer preference
The single most common driver of which system gets specified is which manufacturer the project's geotechnical or structural engineer has used before. Engineers stamp drawings based on the published capacity tables and the ICC-ES report. An engineer who has stamped 50 Grip-Tite designs is going to stamp the 51st faster than they are going to learn ECP's tables.
For independent contractors choosing which system to certify on, the right question is which manufacturer's local dealer network and engineering support is stronger in the market. Both companies provide design assistance to certified installers; the relationship matters more than the product spec sheet.
Decision 2: Capacity vs cost
Both systems publish allowable working loads (factored downward from ultimate by a factor of safety, typically 2). For typical residential underpinning:
- Grip-Tite SS5: 30,000-40,000 lb working load depending on soil and depth.
- Grip-Tite SS150: 60,000-80,000 lb working load.
- ECP PPB-288: 30,000-40,000 lb working load.
- ECP PPB-350: 70,000-100,000 lb working load.
For a typical residential settlement repair carrying 15,000-30,000 lb per pier, the smaller-diameter systems (SS5 or PPB-288) are adequate. The larger systems are specified for heavier residential work, light commercial, or where ultimate-load testing is required at 1.5x or 2x working load and the smaller tubes do not have headroom.
Price differential between the two manufacturers is typically small (under 10 percent at dealer level), so capacity is a more meaningful driver than dollar cost per pier.
Decision 3: Installation equipment
Grip-Tite installation uses hydraulic ram cylinders rated for the system capacity (typically 30 ton for SS5, 50 ton for SS150). The ram is mounted in a manifold that reacts against the structure being underpinned.
ECP installation uses similar hydraulic rams; ECP's Tier system manifold geometry differs from Grip-Tite's.
A contractor who owns Grip-Tite manifolds and rams faces a meaningful capital expense to switch to ECP equipment, and vice versa. This is the single largest sunk-cost factor in switching systems.
Decision 4: Bracket geometry
Both companies offer remote brackets that sit on the footing edge with the pier shaft extending into the soil at a slight offset. Remote brackets are the typical residential installation.
ECP's Plate Pier system (proprietary) attaches to the slab edge for slab-on-grade homes where there is no continuous footing, providing a different mechanical attachment than the standard remote bracket. Where the foundation is a thickened-edge slab and the engineer is asking for slab-edge underpinning, the Plate Pier may be the deciding feature.
Grip-Tite's equivalent for slab-edge work is a thicker remote bracket with welded-on attachment plates; the function is similar.
Decision 5: ICC-ES evaluation report
Both ICC-ES ESR-1854 (Grip-Tite) and ESR-2820 (ECP) cover use under the IBC and IRC. Both reports are kept current with code cycle updates.
The reports specify:
- Allowable load tables by tube size and embedment depth.
- Installation acceptance criteria (ram pressure relationship to load).
- Bracket capacity by attachment configuration.
- Footing condition requirements.
A contractor working in a jurisdiction with active code-enforcement on residential underpinning (California, Florida, parts of Texas) will need the current ESR on file for permit submittal. Both manufacturers publish their ESRs at no cost.
Decision 6: Local dealer network
For ongoing residential foundation repair work, fast dealer fulfillment is the difference between a 2-day job and a 5-day job. Grip-Tite and ECP both operate dealer networks; coverage differs by region.
Pre-decision research: identify the nearest dealer for each system, dealer reorder lead time, and dealer technical support response time. A 200-mile dealer for the cheaper system loses to a 50-mile dealer for the more expensive system on most jobs.
Decision 7: Engineering support
Both companies provide design assistance to certified installers. The level of support varies:
Grip-Tite: published design tables in the ICC-ES report and in the installation manual; design-assist available through Grip-Tite engineering on complex projects.
ECP: published design tables; ECP also publishes a more extensive design library covering load combinations, eccentric loading, and uplift configurations.
For a contractor who handles residential straight-down compression loads and does not handle commercial or specialty work, both companies' standard documentation is sufficient. For a contractor handling industrial-floor underpinning, lateral-load piers, or uplift conditions (helical-equivalent), ECP's design library is generally more thorough.
Decision matrix
References
- ICC-ES ESR-1854, Grip-Tite Manufacturing Co. Steel Foundation Piles, Evaluation Service Report.
- ICC-ES ESR-2820, Earth Contact Products LLC Steel Foundation Piles, Evaluation Service Report.
- Grip-Tite Manufacturing Co. Push Pier Installation Manual, current revision, griptite.com.
- Earth Contact Products Push Pier Installation Manual, current revision, earthcontactproducts.com.
- ASTM D1586/D1586M, Standard Test Method for Standard Penetration Test (SPT) and Split-Barrel Sampling of Soils.
- IBC Chapter 18, Soils and Foundations, 2021 International Building Code.