When Settled Concrete Creates Drainage Problems: What Contractors Should Look For
For foundation repair and waterproofing contractors, the concrete surrounding a structure can tell an important part of the story.
A settled driveway, patio, sidewalk, porch, or other concrete slab isn’t always just a cosmetic concern or trip hazard. When concrete settles and begins sloping toward a structure, it can change how water moves across the property. Instead of directing runoff away from the foundation, the affected slab may allow water to collect near foundation walls or contribute to already poor drainage conditions.
That makes exterior concrete worth a closer look during foundation and waterproofing evaluations.
Recognizing these conditions can help contractors identify contributing factors to moisture problems, recommend more comprehensive repairs, and uncover concrete lifting opportunities that might otherwise be overlooked.
Settled Concrete Can Become a Water-Management Problem
Concrete flatwork depends on adequate support from the soils beneath it. When those soils settle, erode, wash out, or lose their ability to adequately support the slab, the concrete above can sink or become uneven.
The direction of that settlement matters.
When a driveway, patio, sidewalk, or other slab settles toward a home or building, rainwater and runoff may also be directed toward the structure. That can contribute to increased moisture around the foundation, erosion or washout, and water-management problems around the property.
For contractors already evaluating foundation movement or basement moisture, exterior concrete should therefore be part of the overall inspection—not an unrelated issue.
What Contractors Should Look for Around the Property
When evaluating a property, take time to look beyond the foundation itself. Several conditions around exterior concrete may indicate settlement or inadequate drainage.
Watch for:
- Concrete surfaces that pitch toward the foundation
- Water pooling where concrete meets the structure
- Uneven or sunken driveway slabs
- Settled patios or porches
- Sidewalk sections that have dropped or become uneven
- Gaps beneath concrete slabs
- Visible soil erosion or washout along slab edges
- Changes in elevation between adjoining slabs
- Trip hazards created by differential settlement
- Evidence of runoff repeatedly moving toward the structure
These observations can help determine whether concrete settlement is contributing to a larger drainage issue.
They can also reveal an opportunity to provide a more complete solution to the property owner.
Why Does Concrete Settle?
Before recommending a repair, contractors need to understand why the slab moved.
Concrete settlement frequently originates below the concrete rather than within the slab itself. Conditions that can contribute to settlement include:
Poorly Compacted Fill
If fill soils beneath a slab were not adequately compacted during construction, they may compress over time and leave the concrete without uniform support.
Soil Erosion and Washout
Water moving beneath or alongside a slab can carry soil particles away. As supporting material disappears, voids can develop beneath the concrete.
Changing Soil Conditions
Soils can respond differently to changes in moisture. Loss of support beneath portions of a slab can eventually result in uneven settlement.
Drainage Problems
Downspouts, improper grading, heavy runoff, leaking water lines, and other sources of concentrated water can affect the soils supporting concrete.
Freeze-Thaw Conditions
In colder climates, repeated freezing and thawing can contribute to movement in the soils supporting exterior concrete.
Identifying the conditions contributing to settlement helps contractors determine whether concrete lifting is appropriate and whether other drainage or site improvements should also be addressed.
How Polyurethane Concrete Lifting Addresses Settled Slabs
When the concrete itself remains suitable for repair, polyurethane concrete lifting can provide contractors with an alternative to removing and replacing the affected slab.
The process begins with an assessment of the slab, underlying conditions, and desired lift. Small injection holes are drilled through the concrete at strategically selected locations. Polyurethane material is then injected beneath the slab.
As the material reacts and expands, it can fill underlying voids, provide support, and allow the contractor to carefully raise the affected concrete.
ECP’s PolyPier® system includes polyurethane formulations engineered for professional concrete lifting, leveling, void filling, and soil stabilization applications. Different formulations are available to accommodate different project and site conditions.
Contractors interested in the products, equipment, applications, and technical details behind the system can learn more about PolyPier concrete lifting solutions at PolyPier.com.
Why Concrete Lifting Belongs in a Comprehensive Property Evaluation
A homeowner may call a contractor because of water in the basement, a foundation crack, or another obvious symptom. The source of the problem, however, may involve several conditions around the property.
That’s why contractors should consider the entire water-management picture.
For example, correcting a settled patio that directs runoff toward a foundation may be one component of a larger repair strategy that also involves grading, drainage improvements, gutters and downspouts, foundation repairs, or a waterproofing system.
Concrete lifting should not automatically be presented as a solution to every basement moisture or foundation problem. Instead, it gives contractors another tool for addressing an identifiable condition that may be contributing to water movement around a structure.
That distinction helps contractors make better recommendations while providing customers with a more complete understanding of what is happening around their property.
Concrete Lifting Can Expand Your Service Opportunities
For foundation repair and waterproofing contractors, identifying settled concrete doesn’t necessarily have to mean referring the work to another company.
Concrete lifting can complement services you already provide.
The same property with foundation settlement or waterproofing concerns may also have a sunken driveway, uneven sidewalk, settled patio, garage slab, porch, or other concrete problem.
Adding polyurethane concrete lifting capabilities can allow contractors to address more of those needs while expanding the range of services they offer existing customers.
PolyPier supports contractors with polyurethane materials, concrete lifting equipment, training, and technical support designed specifically for professional concrete lifting operations.
Training Matters When Adding Concrete Lifting Services
Successful concrete lifting involves more than purchasing foam and injection equipment.
Contractors need to understand slab behavior, underlying void conditions, injection patterns, material selection, equipment operation, and how the concrete may respond as polyurethane expands beneath it.
Hands-on education can help crews develop the skills necessary to evaluate projects and perform controlled lifts.
Through PolyPier, contractors have access to training and support intended to help them understand both the materials and the concrete lifting process before putting those skills to work in the field.
Make Exterior Concrete Part of the Inspection
Foundation and waterproofing contractors are often called to a property because the owner has already noticed a problem. A thorough inspection can reveal additional conditions that may be contributing to it.
Take a few extra minutes to walk the exterior.
Look at the driveway. Check the patio. Examine sidewalks and other slabs near the structure. Pay attention to where water will travel during the next heavy rain.
A settled slab may be more than another item on the inspection report. It could be an important part of understanding the property’s drainage conditions—and an opportunity to provide a more comprehensive repair solution.
Grow Your Concrete Lifting Capabilities with ECP
Earth Contact Products works with foundation repair, waterproofing, and concrete repair professionals who want reliable products backed by engineering, education, and industry support.
If you’re interested in adding polyurethane concrete lifting to your services or expanding your existing concrete repair capabilities, explore the PolyPier system and contractor resources or contact ECP to learn more about becoming an ECP partner.
Frequently Asked Questions About Concrete Lifting and Drainage
Yes. When exterior concrete settles in a way that causes the surface to pitch toward a structure, runoff may be directed toward the foundation rather than away from it. Contractors should evaluate the concrete along with grading, gutters, downspouts, drainage systems, and other site conditions when investigating water-management problems.
In appropriate applications, polyurethane concrete lifting can be used to raise settled portions of a slab and improve its elevation or pitch. Contractors should first evaluate the condition of the concrete, the cause of settlement, underlying support conditions, and surrounding drainage before determining whether lifting is appropriate.
Polyurethane systems can be used in many concrete lifting applications, including driveways, sidewalks, patios, pool decks, steps, interior floor slabs, and certain commercial and infrastructure applications. The appropriate material and installation approach depend on project conditions.
No. Depending on the formulation and application, geotechnical polyurethane can also be used for applications such as under-slab void filling, stabilization, and other ground-improvement work. PolyPier offers multiple polyurethane formulations designed for different project conditions and applications.
Voids can develop when supporting soils settle or when water erodes or washes soil away beneath a slab. Poorly compacted fill and changing soil conditions can also contribute to loss of support.
Yes. Concrete surfaces can provide useful information about drainage and site conditions around a structure. Slabs that have settled toward the building, visible washout, gaps beneath concrete, or water pooling along the foundation may warrant additional investigation.
Yes. Concrete lifting can complement foundation repair, waterproofing, and other structural or concrete repair services. Contractors considering adding the service should account for equipment, material selection, crew training, job evaluation, and proper installation techniques.
Contractors can visit PolyPier.com to learn more about PolyPier polyurethane products, concrete lifting applications, equipment, training, and contractor resources.