The Pros and Cons of Slab Foundation Leveling Methods

You’re finding out there are different ways to fix your unlevel slab. Pilings, piers, polyjacking . . . what are these things?? You’re knee-deep in online research, trying to separate marketing hype from actual facts. In other words, you’re feeling overwhelmed trying to figure out which repair method will actually work for your Texas home.

Can’t someone just tell you which one is right for your situation? Or maybe list the pros and cons of any available options?

Here at Anchor Foundation Repair, we’ve been raising and stabilizing Brazos Valley slabs since 1985. We’ve seen how different foundation leveling methods perform in our area’s soils. Honesty alert: We specialize in one method (drilled bell-bottom piers), but we understand that being informed about all your options helps you make the best choice.

This article breaks down the main slab foundation leveling methods available in Central Texas. We’ll cover how each one works, and most importantly, the real pros and cons of each approach so you can make a confident decision about your home’s foundation.

Foundation Leveling Options in Central Texas

Not every slab foundation repair method you read about online is actually available in your area. Some methods work better in certain soil types, while others are more common in different parts of the country. If you live in Central Texas, your realistic options typically narrow down to four main approaches.

Each method aims to do the same basic thing: add support under your settled (i.e. sunken) foundation to bring it back toward its original elevation. But they get there in different ways. Some use hydraulic pressure to push supports into the ground, while others rely on drilling and pouring concrete. Some are quick to install, others take more time.

The four main slab foundation leveling methods you’re likely to encounter in our area are:

• Pressed pilings (concrete, steel, or hybrid versions)
• Steel helical piers
• Drilled bell-bottom piers
• Polyjacking (also called polyfoam injection)

Each has its place and purpose. Understanding what sets them apart will help you ask better questions when talking to contractors and feel more confident about the repair method that ends up under your home.

How Do Pressed Pilings Work for Foundation Leveling?

Pressed pilings are probably the most common foundation repair method you’ll run into around Texas. If you get multiple bids, chances are good that at least one or two contractors will be offering some version of this approach.

Here’s the basic idea: contractors use hydraulic equipment to press precast concrete cylinders or steel sections into the ground, one piece on top of another, until they can’t press anymore. They keep going until they hit enough resistance in the soil to support your home’s weight. The pilings are installed under your foundation’s concrete beam to lift the settled areas back up and secure your foundation.

Now here’s where it gets a little confusing. There are several variations of pressed pilings out there, and each contractor seems to have their own “special” version, often with a trademarked name or something *patented*:

• Plain concrete cylinders that aren’t connected to each other
• Concrete sections connected together with steel cable or rebar
• All-steel interlocking versions
• Hybrid designs with steel at the bottom and concrete on top (likely cabled)

Don’t let the fancy names fool you. Pressed pilings, no matter the variety, all work on basically the same principle, even if each company markets theirs as revolutionary or patented. The main differences come down to whether the sections are connected and what materials are used.

Pros of Pressed Pilings

• Faster installation than other methods. Most pressed piling jobs wrap up in 3 to 5 days, which means less disruption to your life.
• Often less expensive upfront. Concrete pressed pilings especially tend to have lower initial costs compared to other methods, though steel versions are pricier.
• Widely available. It’s the most popular method in Texas, so you’ll have more contractors to choose from and can easily get multiple bids.
• Lots of variations to pick from. If you want steel reinforcement or other features, there are versions available to match different budgets and needs. Cabled and interlocking steel versions should have better stability over unconnected concrete pilings.

Cons of Pressed Pilings

• Confusion from too many variations. With so many “special” versions out there, it’s hard to know what you’re actually getting or if one is truly better than another.
• May not reach stable soil. Pressed pilings stop when they hit resistance, but that resistance might just be from dry soil conditions rather than an actual stable layer. When moisture returns, things can shift.
• Susceptible to obstructions. Since they’re being pressed through soil without a clear path, they can hit rocks or other obstacles and veer off course during installation.
• Long-term stability questions. Some pressed pilings (especially the unconnected concrete cylinder versions) may settle or shift over time, particularly in Texas’ shrink-swell clay soils. Soil moisture levels are guaranteed to change, and the friction holding the piling in resistance to your home will change too.

What About Steel Helical Piers for Slab Foundations?

Steel helical piers look like giant screws that get twisted into the ground under your foundation. They have large helical blades (like screw threads) welded onto a steel shaft, and these blades are designed to “bite” into the soil as the pier is rotated down.

The installation process uses high-tech hydraulic machinery that both rotates the pier into the ground and monitors the torque (rotational resistance). Once the equipment reaches a preset torque level, that tells the contractor that the pier is secure in the soil and strong enough to support the load. At that point, they attach it to your foundation and use the same equipment to lift your home.

This method relies heavily on the equipment doing the work and the “thinking”, which means less manual labor but also means you’re depending on the machinery and the operator’s experience to get things right. All that high-tech machinery also comes with higher costs.

Pros of Steel Helical Piers

• Can reach deeper soil layers. When installed correctly, helical piers can access more stable soil below the active zone where moisture changes are less dramatic.
• All-steel construction is strong. There’s no question that steel can handle heavy loads and won’t easily degrade.
• Immediate load-bearing capacity. Unlike poured concrete that needs to cure, helical piers can support weight as soon as they reach the proper torque.
• Faster than drilled piers. The mechanized installation takes less time than methods that require digging, pouring concrete, and waiting for it to set.

Cons of Steel Helical Piers

• Higher cost. Steel helical piers are typically the most expensive option, both for materials and the specialized equipment needed to install them.
• Quality depends heavily on installer skill. The equipment might do the heavy lifting, but human judgment is still crucial. An inexperienced operator can make costly mistakes.
• Less available in our area. Not many (or maybe not any) contractors around the Brazos Valley offer this method, so your choices are limited. You’ll likely need to bring in someone from out of town.
• Performance questions in clay soil. In areas with extreme shrink-swell clay cycles like ours, the helical design doesn’t always grip the soil as reliably as hoped, especially during soil expansion.

How Do Drilled Bell-Bottom Piers Compare?

Drilled bell-bottom piers are the old-school approach to foundation repair. This method has been around longer than the others and was even backed by HUD (the Department of Housing and Urban Development) back in the day. Whether government approval is reassuring or concerning is up to you, but the method has stood the test of time in Texas.

Here’s how it works: contractors use an auger to drill a hole about 10 to 12 feet deep, going past the active soil zone where moisture changes cause the most movement. At the bottom, they carve out a bell shape (wider than the shaft above it), which creates a strong anchor point. The hole gets filled with steel-reinforced concrete, and a column is formed that reaches just below your foundation beam. Once the concrete cures, it becomes one solid piece from top to bottom.

This approach doesn’t rely on fancy machinery to do the thinking. It’s more hands-on and labor-intensive, which means it takes longer but also allows for more human oversight and quality control at each step.

Pros of Drilled Bell-Bottom Piers

• Specifically designed for expansive clay. This OG method was developed for and proven in Texas-style clay soils over many decades of real-world use.
• Bell shape resists uplift and settlement. The wider base creates a strong anchor that resists both downward settlement and the upward forces from soil expansion.
• One-piece monolithic design. Because it’s poured as a single unit, there are no joints, connections, or separate pieces that could shift independently over time.
• Straight, unobstructed shaft. The drilling process creates a clear path straight down, so you know exactly where your support is positioned without wondering if it veered off course.
• Similar to commercial construction standards. This method closely resembles the deep foundation techniques used for commercial buildings, which need to last and support heavy loads.

Cons of Drilled Bell-Bottom Piers

• Takes significantly longer. Where pressed pilings might take 3 to 5 days, drilled piers typically need 3 to 4 weeks because of drilling, pouring, and concrete curing time.
• More labor-intensive process. This isn’t the “easy” way to repair a foundation. It requires skilled workers and more hands-on effort at every step.
• More intrusive in some ways. The digging and drilling process takes time and can be more disruptive than other methods, though the work still happens mostly outside your home. Dirt piles accumulate as material is removed to create space for the piers.
• Old-school design. The method hasn’t changed much in decades, which some see as proven reliability and others see as lack of innovation.
• Higher cost than basic pressed pilings. All that labor and time means drilled piers tend to cost more than simple concrete pressed piling options.

Is Polyjacking a Good Foundation Leveling Option?

Polyjacking for foundation leveling is a completely different animal from the other methods. Instead of installing vertical supports that go deep into the ground, polyjacking injects expanding polyurethane foam under your foundation to lift from below and fill as it lifts.

The process involves drilling small holes through your slab and pumping in a two-part chemical mixture that expands like shaving cream, then hardens into a rigid foam material. As it expands, it lifts the foundation. The foam doesn’t penetrate deep into the soil but rather spreads out horizontally under your slab, resting on the soil surface underneath your home.

Some contractors use polyjacking as a stand-alone method, while others combine it with traditional perimeter piering in a hybrid approach. The hybrid method uses strong perimeter supports (like drilled piers or pressed pilings) around the edges with foam injection to handle any interior settlement.

Pros of Polyjacking

• Less invasive than traditional piering. The injection holes are small, and interior work can be done from inside the home without cutting into your slab for installation.
• Lower costs for interior foundation work.
• Flooring damage is more minimal. With any interior work, your flooring is compromised. With polyjacking, only small holes are drilled vs. the possibility of all your flooring needing to be removed and likely replaced with another method.
• Quick installation. Polyfoam jobs can often be completed in one to two days, much faster than methods that require digging and concrete curing.
• Works well in hybrid systems. When combined with strong perimeter support from other methods, interior polyjacking can be effective and less messy and intrusive than installing interior piers.

Cons of Polyjacking

• Doesn’t reach stable soil. The foam sits on top of the soil rather than penetrating to deeper, more stable layers, so it’s still impacted by the active zone’s moisture changes.
• Long-term performance questions. Because the method is newer and doesn’t reach stable soil, there are legitimate concerns about how well it holds up over time in aggressive clay soils.
• Fully filling voids questionable. If your slab has large voids underneath (common after settlement), foam expands into these spaces, but gaps and air pockets can be left that could accumulate water or something else. This creates the potential for further settlement issues.
• Not available everywhere. Fewer contractors offer this method (or may only offer it for flatwork and not foundations). It may require you to bring in specialists from larger cities if they are willing to come out.
• May need retreatment. Foam installations may need follow-up treatments or adjustments more frequently than deep pier methods.
• Variable pricing. Costs can range widely depending on how much foam is needed and whether it’s used alone or in combination with other methods.

What Do These Foundation Repair Methods Cost and How Long Do They Take?

Let’s talk about money and time, because those are probably two of your biggest concerns right now. Unfortunately, there’s no simple answer to “how much will it cost?” because every home and situation is different. But we can give you some general ranges to help you plan.

Individual pier costs could run from $500 to $1,500 per support, depending on the method and materials used. Basic concrete pressed pilings usually fall on the lower end, while hybrid pilings or steel helical piers, and drilled bell-bottom piers tend toward the higher side. The total cost for your project depends on how many supports your home needs, which varies based on the extent of settlement and the size of the affected area.

Most foundation repair projects in our area range from $8,000 to $30,000 or more. Smaller corner repairs with 8 to 12 piers might be on the lower end, while homes needing support around multiple walls or under interior areas can climb much higher.

Polyjacking costs are structured differently since you’re not counting individual piers. Instead, pricing is based on the amount of foam needed and the area being treated. Expect to pay anywhere from $3,000 to $15,000 or more, depending on the scope.

As for timelines:

• Pressed pilings: 3 to 5 days for most jobs
• Steel helical piers: 3 to 7 days, depending on pier count and access
• Drilled bell-bottom piers: 3 to 4 weeks due to drilling, pouring, and concrete curing
• Polyjacking: 1 to 2 days for most residential applications

Remember, these are general estimates. Your specific situation, soil conditions, weather delays, and contractor scheduling can all affect both cost and timeline.

Try out our cost estimator for drilled piers 👉 Calculate Your Slab Foundation Repair Costs Here

How Do You Pick the Right Method for Your Texas Home?

When comparing bids from different contractors, each one is pushing their method as “the best.”

So with all these options, how do you actually decide? There’s no universal “best” method that works for everyone. The right choice depends on your priorities, your home’s specific situation, your budget, and how long you plan to stay in the house.

Think about what matters most to you. Are you looking for the fastest fix? Need maximum long-term stability? Working with a tight budget? Your answers will point you toward different methods. Also consider that minor settlement on one corner requires a different approach than widespread issues affecting multiple areas.

And here’s something important: when you’re choosing a foundation repair company in our area or elsewhere, you’re often choosing their method too. Most contractors specialize in one approach, and that’s what they offer. So in many cases, the decision about method and contractor go hand in hand.

Understanding Your Foundation Leveling Options

Now that you know the real pros and cons of each foundation leveling method, you’re in a much better position to evaluate bids and pick the approach that aligns with your home goals. Here’s what really matters: no method is perfect, and anyone who tells you theirs has zero downsides isn’t being straight with you. 

Each approach has situations where it may or may not be the best fit.

At Anchor Foundation Repair, we’ve chosen to specialize in drilled bell-bottom piers because we’ve seen how they perform over the long haul in our area’s challenging clay soils. After 40+ years and thousands of repairs, we trust this method to deliver the lasting stability our community deserves. 

We also offer a lifetime transferable warranty to back that up, and plan to be here to honor it. But we also know that drilled piers aren’t right for every homeowner in every situation. Sometimes budget constraints, timing, or your needs point toward another company, and that’s okay. 

Our goal is to help you get what you need, and sometimes that’s not us. Bet you not every foundation repair contractor would say that . . .

The next step is figuring out which contractor you can trust. Check out our article on 15 Best Questions to Ask Before Hiring a Foundation Repair Contractor. It’ll help you screen contractors effectively and feel confident about who ends up working on your home.