Your pool deck takes a beating. It’s constantly exposed to water, sunlight, and foot traffic—and underneath, the soil is quietly shifting. Over time, even a well-built pool deck can begin to crack, tilt, or sink. When that happens, you’re not just dealing with an eyesore. You’re looking at a real safety hazard.
The good news: in most cases, concrete leveling can restore your pool deck without the cost and disruption of a full replacement. This guide walks you through why pool decks sink and shift, what the warning signs look like, how the leveling process works, and what you can do to keep your deck stable for the long haul.
If you’re in Central Texas—Austin, San Antonio, or the surrounding areas—there’s also some important local context you should know, because Texas soils and climate create a particularly challenging environment for concrete around pools.
Why Do Pool Decks Sink and Become Uneven?
Pool deck settlement is common—and it’s almost never caused by a single thing. Most of the time, it’s a combination of soil conditions, water movement, and the natural aging of the concrete itself. Here are the most frequent culprits:
Soil Erosion and Washout
Water is the number one enemy of concrete stability. Splash-out from the pool, rain runoff, and irrigation can all gradually erode or wash away the soil underneath your deck slabs. When that sub-base washes away, the concrete above it loses its support and begins to settle into the void.
Soil Shrinkage and Expansion
In Texas, this is one of the biggest factors. The clay-rich soils throughout the Austin and San Antonio metro areas are highly reactive to moisture. During dry spells, the soil contracts and shrinks—pulling away from the underside of the concrete. During wet periods, it expands again. This repeated cycle of shrinking and swelling causes slabs to move, crack, and settle unevenly over time.
Poor Compaction at Installation
If the soil wasn’t properly compacted before the deck was poured, settlement can begin relatively quickly. Loose or poorly prepared sub-base material compresses under the weight of the concrete and traffic over time, leading to sinking slabs.
Tree Roots
Roots from nearby trees and shrubs can grow under concrete slabs, either lifting sections of the deck or—when they die and decompose—leaving voids that allow the concrete to drop. If you notice a section of your pool deck rising, tree roots may be the culprit.
Plumbing Leaks
A slow leak in the pool’s underground plumbing system can saturate the surrounding soil. Over time, saturated soil loses its load-bearing capacity, and the concrete above it begins to sink. If you’re seeing settlement concentrated near return lines or skimmers, a plumbing leak is worth investigating.
Warning Signs Your Pool Deck Needs Attention
Catching the problem early is key. The longer uneven concrete sits unaddressed, the more the underlying void grows—and the more complicated (and expensive) the repair becomes. Watch for these signs:
- Visible cracks: Hairline cracks are normal, but wide or growing cracks—especially diagonal ones running from corners—often indicate movement in the slab.
- Uneven surface or “step” between slabs: If slabs have shifted so there’s a noticeable height difference between panels, that’s a tripping hazard and a sign of soil movement.
- Gaps along the pool shell: Separation between the pool shell and the surrounding deck is a red flag. It often means the deck is pulling away from the pool structure, which can eventually damage the shell itself.
- Water pooling on the deck: If water isn’t draining away from the pool properly and is instead sitting on the deck, the surface has likely shifted out of its original slope.
- Sunken sections: Any section of the deck that’s visibly lower than it used to be points to sub-base settlement.
- Hollow sound when tapped: Knock on your deck with your knuckles or a mallet. A hollow sound indicates a void has formed beneath—meaning the concrete has lost support.
If any of these sound familiar, it’s a good time to read through our guide on how to know if your concrete needs leveling before the problem gets worse.
Why Uneven Pool Decks Are a Bigger Problem Than They Look
It’s easy to look at a slightly sunken or cracked deck slab and tell yourself you’ll deal with it later. But pool deck problems tend to compound:
- Safety: An uneven pool deck is a trip hazard—especially dangerous around a pool where surfaces are wet. Raised slab edges and sunken sections are a leading cause of poolside injuries.
- Structural damage to the pool shell: As the deck shifts, it can put pressure on the pool coping and shell. Persistent movement can crack or damage the pool structure itself—a far more expensive repair.
- Water intrusion: Gaps that open up around the pool allow water to flow underneath the deck and into the pool’s shell cavity, accelerating erosion and potentially damaging waterproofing systems.
- Escalating repair costs: The longer the settlement goes unaddressed, the larger the voids beneath the concrete grow. Small voids are quick and affordable to fill. Large voids take significantly more material and time to correct.
How Concrete Pool Deck Leveling Works
Concrete leveling—also called concrete lifting or slab lifting—is the process of raising sunken concrete back to its original position by filling the void beneath it. There are two primary methods in use today:
Foam Leveling (Polyurethane Foam Injection)
Foam leveling is the modern, preferred method for pool deck work. Small holes (about the diameter of a penny) are drilled into the sunken slab, and a two-part closed-cell polyurethane foam is injected underneath. The foam expands to fill the void and lifts the concrete back to level, then cures quickly—typically within 15 to 30 minutes.
Polyurethane foam is the preferred choice around pools for several reasons:
- It’s lightweight—adding very little weight to the sub-base, which reduces the risk of future settlement.
- It’s water-resistant and won’t erode or wash away like traditional mudjacking slurry.
- It cures fast, meaning minimal disruption and a quick return to service.
- The injection holes are small and easy to patch cleanly.
- It’s environmentally friendly—Apex Group uses eco-friendly, closed-cell polyurethane products.
Want to understand more about when foam leveling is the right call? We break it down in detail here: When Is Foam Concrete Leveling the Right Choice Over Other Leveling Methods?
Mudjacking (Slabjacking)
Mudjacking is the traditional method. A slurry mix of cement, soil, and water is pumped through larger holes in the slab to fill the void and lift the concrete. It’s a proven technique and is generally less expensive per job, but around pool decks it has some disadvantages: the slurry adds significant weight, the larger holes require more noticeable patching, and the material can erode over time if water continues to wash through.
For most pool deck applications—where water exposure is ongoing and aesthetics matter—foam leveling is the better long-term solution.
Concrete Leveling vs. Full Replacement: Which Is Right for You?
One of the first questions homeowners ask is whether they should level their existing pool deck or tear it out and start over. In most cases, leveling is the right answer—but not always.
Concrete leveling is a strong option when:
- The concrete is structurally intact—cracked or settled, but not crumbling or spalling extensively
- Slab panels have sunk but are otherwise solid
- The settlement is localized rather than widespread
- The underlying cause (erosion, soil shrinkage) has been or can be addressed
Replacement may be the better route when:
- The concrete is severely deteriorated—widespread crumbling, deep scaling, or structural failure
- Multiple slabs across the entire deck have settled significantly
- There is extensive reinforcement corrosion inside the slab
- You’re planning to change the design or size of the deck anyway
For most homeowners, leveling costs a fraction of full replacement and delivers results that last for years when properly maintained. A professional assessment is the best way to know for sure which path makes sense for your specific deck.
Leveling Concrete for Above-Ground Pools (and Two-Level Decks)
Above-ground pool setups present their own concrete leveling considerations, especially when the pool sits on or near a concrete pad—or when a multi-level deck is involved.
How to Level Concrete for an Above-Ground Pool
For an above-ground pool that sits directly on a concrete slab, a level surface is non-negotiable. An unlevel base puts uneven stress on the pool walls and liner, can cause the pool to shift or bow, and shortens its lifespan significantly.
If the concrete base has settled unevenly, options depend on the degree of unlevelness. Minor settling can often be addressed by grinding down high spots or using self-leveling concrete overlay to bring low areas up to grade. More significant settlement—where one side of the pad has dropped relative to the other—generally calls for foam or mudjack lifting to raise the sunken section back to level.
Important: before attempting any leveling work on a pad that an above-ground pool sits on, the pool must be emptied and removed from the pad. Working around a filled pool is not safe and limits access to the slab surface.
Two-Level Decks with Above-Ground Pools
A popular design choice for above-ground pools is the two-level deck: one platform at pool entry height that connects directly to the pool wall, and a lower surrounding deck at grade level. When one or both levels of these decks begin to settle or shift, leveling becomes more complex—but it’s still very achievable.
The primary concern with a two-level concrete deck setup is differential settlement—where the upper and lower platforms settle at different rates. This can create a dangerous step height between levels or cause the upper platform (which may be attached to or adjacent to the pool wall) to pull away from the pool structure.
Leveling crews need to assess each platform independently and plan lifts carefully so that raising one section doesn’t put stress on the transition between levels. Foam leveling’s precision and controlled expansion make it particularly well-suited for these situations, as the amount of lift can be carefully controlled.
Pool Deck Leveling in Texas: What Homeowners Need to Know
Texas presents a uniquely demanding environment for pool deck concrete. If you’re in the Austin, San Antonio, or surrounding areas, these local factors significantly affect how quickly pool decks shift—and what the right repair approach looks like.
Expansive Clay Soils
The clay-heavy soils common throughout Travis, Bexar, Williamson, and Hays counties are highly expansive. They swell when wet and shrink when dry—and in Central Texas, the swing between wet and dry conditions can be dramatic. Pool decks built on these soils are almost always subject to movement over time. This doesn’t mean your deck was built poorly; it means the underlying geology demands regular monitoring and proactive maintenance.
Heat and UV Exposure
Texas summers are brutal on concrete. Prolonged UV exposure degrades surface sealers, and extreme heat accelerates the shrink-swell cycle in the soil below. Pool decks in Austin and San Antonio often see surface cracking accelerate in summer months, particularly during drought conditions when the underlying clay pulls away from the slab bottom.
Drought and Heavy Rain Cycles
Central Texas alternates between drought and heavy rainfall—sometimes dramatically within a single season. Flash floods and heavy rains following dry spells can rapidly erode loosened sub-base material, accelerating pool deck settlement. This makes drainage planning around pool decks especially important in the Texas climate.
What This Means for Repair
Because Texas soils are so reactive, simply leveling a sunken pool deck without addressing drainage or ongoing moisture management may only buy you a few years before the problem returns. A good contractor will assess not just what needs lifting but why it settled—and help you think through how to reduce the risk of future movement.
Maintaining Your Pool Deck After Leveling
Getting your pool deck leveled is the fix; maintenance is what keeps it level. A few proactive habits can significantly extend the life of your repair and slow the rate of future settlement.
Seal the Surface
A quality concrete sealer reduces water penetration into the slab and slows the erosion of the sub-base beneath it. For pool decks, choose a sealer that’s rated for wet environments and slip resistance. Resealing every two to three years is a reasonable maintenance interval for most Texas pool decks.
Manage Drainage
Poor drainage is the root cause of most pool deck settlement. Make sure the deck maintains proper slope away from the pool and toward drains or landscaped areas. Clean deck drains regularly and watch for signs of water pooling after rain or heavy pool use.
Fill Cracks Promptly
Small cracks are an entry point for water. If left open, water works its way into the sub-base and accelerates erosion. Filling cracks with an appropriate concrete caulk or filler as soon as they appear is one of the most effective and least expensive maintenance steps you can take.
Check Your Pool Plumbing
If you notice ongoing settlement concentrated near the pool shell, return lines, or equipment, have your pool plumbing pressure-tested to rule out a slow underground leak. Addressing a plumbing leak before leveling is critical—if leaking water is the source of the erosion, the leveling repair won’t hold.
Do Annual Inspections
Once a year—ideally at the start of pool season—walk your entire deck and look for new cracks, level changes between slabs, gaps at the pool shell, and drainage issues. Catching movement early means smaller voids, faster repairs, and lower costs. For more guidance on post-repair maintenance, see our guide on tips to protect your concrete after leveling.
When to Call a Concrete Leveling Professional
Some minor surface cracking can be handled as a DIY repair. But for pool decks—where water exposure, safety around a pool, and proximity to the pool structure are all factors—most leveling and significant crack repair work is best left to professionals.
Call a professional when:
- There is a visible height difference between any two adjacent slabs
- Cracks are wider than a quarter inch or are actively growing
- You hear a hollow sound when tapping the deck surface
- There is a separation between the deck and the pool coping or shell
- Water is pooling on the deck surface after rain or pool use
- Settlement is concentrated near the pool equipment or return lines
Attempting to lift or fill concrete incorrectly can make the situation worse—cracking slabs further or causing uneven lift that creates new trip hazards. A trained leveling contractor has the equipment and experience to assess the extent of the void, plan the injection points correctly, and execute the lift precisely.
Pool Deck Leveling in Austin, San Antonio & Beyond
Apex Group is a Texas-based concrete contractor with decades of experience in concrete leveling, repair, and restoration for residential and commercial properties throughout Austin, San Antonio, and the surrounding areas. We use eco-friendly, closed-cell polyurethane foam products to lift and stabilize sunken slabs—including pool decks—with minimal disruption and lasting results.
We understand Texas soils, Texas weather, and what it takes to keep concrete stable in a demanding climate. Whether you’re dealing with a single sunken slab near your pool steps or widespread settlement across an aging deck, our team can assess the situation honestly and recommend the right approach—leveling where it makes sense, replacement where it’s warranted.
Learn more about our concrete leveling services and our concrete repair services, or contact us today to schedule a free on-site assessment for your pool deck.
