Summary
Helical piers are rotated into the ground using hydraulic equipment and don’t rely on structural load for installation, making them well suited for lighter structures, additions, and tight access sites. Push piers are hydraulically driven using the weight of the structure itself and perform best on heavier foundations with significant settlement. The choice between them depends on structural load, soil conditions, and site access. Most installations are completed in a single day, with backfilled excavation and same-day return to normal use.
Helical Piers vs. Push Piers: What’s the Difference and When Does Each Apply?
When a foundation inspector tells you your home has settled and recommends piers, the conversation usually turns to two options: helical piers or push piers. Both are steel pier systems installed beneath the foundation to stop movement and, in many cases, lift the structure back toward its original position. The choice between them isn’t arbitrary. Soil conditions, structural load, site access, and the nature of the settlement all factor into which system makes sense for a given home. Knowing how each one works and where it performs best helps you understand what’s being proposed and why.
How Helical Piers Work
Helical piers are steel shafts with helical plates welded along the shaft, installed by rotating them into the ground with hydraulic equipment until the plates reach soil with enough bearing capacity to support the load above. A bracket connects the pier to the foundation footing, transferring the structural load onto the pier system. Unlike push piers, installation doesn’t depend on the weight of the structure to reach depth, which makes helical piers a practical option for lighter loads, additions, and new construction.
Restricted access sites are another common application. The installation equipment is compact enough to work in crawl spaces and areas with limited clearance. Soft or unstable soil near the surface is less of an obstacle, since the helical plates bypass it and anchor into more stable ground at depth.
How Push Piers Work
Push piers are steel pipe sections driven vertically into the ground using the weight of the structure itself as resistance. Crews excavate around the foundation footing, attach a drive stand, and hydraulically advance the pier sections downward until they reach load-bearing soil or bedrock. Once the pier is at depth, the load is transferred from the foundation onto the pier, which can stabilize the structure and in many cases lift it back toward its original elevation.
Because the installation process relies on the structural load to drive the pier, push piers perform best on heavier structures where that resistance is sufficient. They’re a common choice for full foundation walls on existing homes, particularly where significant settlement has occurred and recovery of elevation is a priority. The installation footprint is manageable, but sites need enough clearance around the exterior footing to accommodate the drive equipment.
When to Use Helical Piers vs. Push Piers
The decision between the two systems comes down to a few key factors, and a qualified inspector will evaluate all of them before making a recommendation. Each home presents a different combination of structural load, soil conditions, and site characteristics, so there’s no universal answer. Understanding what drives the recommendation helps you follow the inspector’s reasoning and ask the right questions during your evaluation.
- Structural load: Push piers rely on the weight of the structure to drive them to depth, making them best suited for heavier foundations on existing homes. Helical piers don’t depend on structural load for installation, so they’re the more practical option for lighter structures, porches, additions, and new construction.
- Soil conditions: Helical piers are designed to advance through weak or unstable surface soils and anchor into more competent material below. Push piers are driven until they reach resistance, which works well across a range of soil types as long as sufficient load is present above.
- Site access: Helical pier equipment is compact enough for crawl spaces, tight clearances, and interior applications. Push piers require excavation around the exterior footing, which works on most residential sites but is worth considering on properties with limited perimeter access.
Both systems are permanent solutions when installed correctly, and SafeBasements evaluates each situation individually to determine which pier type or combination of both is the right fit for your home.
What to Expect During a Foundation Pier Installation
Regardless of which system is recommended, the installation process follows a similar sequence. A SafeBasements crew will excavate around the affected areas of the foundation, expose the footing, and attach the pier brackets. From there, the installation method diverges depending on the pier type, with helical piers rotated in and push piers hydraulically driven. Once the piers are at depth and the load has been transferred, the crew will attempt to lift the foundation back toward its original position where conditions allow.
Most residential pier installations are completed in a single day, though larger projects or more extensive settlement may require additional time. Excavated soil is backfilled after installation, and the disruption to landscaping and the surrounding area is generally limited. Homeowners can typically return to normal use of the space the same day work is completed.
SafeBasements backs both pier systems with a Life-of-the-Structure Warranty, so the work is covered for as long as you own the home.
Ready to Find Out Which Pier System Your Home Needs?
Foundation settlement rarely looks the same from one home to the next, and the right pier system depends on factors that only a proper on-site evaluation can determine. If you’ve noticed cracks, sticking doors, or uneven floors and want a clear answer on what’s happening, contact SafeBasements to schedule a free evaluation.
