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Drainage Fixes vs. Slabjacking: Which Do You Need, or Do You Need Both?
Quick summary: Drainage fixes and slabjacking solve two different problems. Drainage fixes, whether that's a French drain, redirected downspouts, regrading, or a surface runoff solution, redirect water away from an area to prevent future erosion and pooling. Slabjacking lifts and stabilizes concrete that has already settled. Neither is a substitute for the other, and depending on what's actually going on at your property, you might need just one, or both, or possibly neither if something else entirely is causing the issue. The only way to know for sure is to have both looked at together.
We hear some version of this question constantly: "Do I need drainage work done, or do I need my concrete lifted?" It's a fair question, and honestly, a smart one to ask before spending money on either. The two get lumped together a lot because they're both common fixes for water-related property issues, but they're not interchangeable, and a lot of homeowners end up paying for the wrong one first simply because nobody explained the difference.
We're not a drainage company, we're a concrete raising company, and we think that's actually an advantage here. We don't have a reason to steer you toward any particular drainage fix, and we're not going to tell you that you need one just to pad a job. Our only job is to tell you honestly what we're seeing and let you decide from there.
What drainage fixes actually do
Drainage problems show up in a lot of different forms, and so do the fixes. A French drain, a trench filled with gravel and a perforated pipe, collects water and redirects it somewhere safer, usually away from a foundation, low spot, or slab. But plenty of drainage issues never need anything that involved. Sometimes the fix is as simple as extending a downspout that's been dumping water right at a slab edge for years. Sometimes it's regrading a section of yard so water flows away from the house instead of toward it. Sometimes it's addressing surface runoff from a slope above the property that's been sending water into the same low spot every time it rains.
All of these are genuinely effective tools when the core problem is water that's collecting somewhere it shouldn't and has nowhere good to go.
What none of these fixes do is lift anything. If water has already been sitting under or beside your driveway for a season or two and the soil underneath has eroded or washed out, fixing the drainage solves the water problem going forward, but it does nothing for the void or the settled concrete that's already there. We've talked to plenty of homeowners who redirected a downspout or installed a French drain expecting their sunken walkway to somehow correct itself afterward, and it just doesn't work that way.
What slabjacking actually does
Slabjacking is the process of injecting polyurethane foam beneath a settled slab to lift it back to grade and fill the void underneath. It addresses the settled concrete and fills the void beneath it. Your driveway, sidewalk, or basement floor gets raised and re-leveled, usually in about a day, without the cost or mess of tearing everything out and repouring.
What slabjacking doesn't do, on its own, is manage water going forward. If the reason your slab settled in the first place was an active drainage issue, whether that's a downspout, poor grading, or surface runoff, and that issue is still there after we lift the concrete, that same spot can be more prone to settling again down the road. It's also worth knowing that in some cases, lifting the slab itself corrects the drainage problem, since a big part of what causes water to pool wrong in the first place is uneven or improperly sloped concrete. Once that slope is restored, water starts moving the way it's supposed to again.
"A lot of homeowners assume that if water is involved, they automatically need some type of drainage system in addition to lifting the concrete, but that isn't always the case. Sometimes the concrete has settled and is now draining the wrong direction, so restoring the proper elevation can correct the issue. Other times there's an active water source, like a downspout or surrounding grade directing water toward the slab. Our job is to identify what we're actually seeing so the homeowner can address the cause along with the settled concrete when necessary."
-Chris Walen, 1-866-SLABJACK, 9+ Years of Industry Experience
How to think about which one you need
A few starting points, though nothing here replaces an actual look at your property:
- If your main complaint is standing water, poor drainage in the yard, or water pooling somewhere with no concrete settling involved, that's more likely a drainage-only situation, and a fix like regrading, downspout extensions, or a French drain may be the right call on its own.
- If your main complaint is a sunken, uneven, or cracked slab and you're not seeing ongoing standing water or pooling nearby, that's often a straightforward slabjacking situation with no separate drainage work needed.
- If you've got both a settled slab and a visible, ongoing water source nearby, like a downspout draining right at the edge of the concrete, poor grading, or runoff that consistently pools against a foundation, that's the scenario where addressing both makes the most sense, and where doing just one without the other tends to lead to a repeat problem.
If you're not sure which category you're in, that's genuinely the most common situation, and it's exactly what a free inspection is for. We touched on this same idea in more detail in our post on why fixing your drainage won't fix your sunken concrete, and vice versa, if you want to dig into the reasoning further.
Why we don't default to recommending both
It would honestly be easier for us to just tell every homeowner they need drainage work done alongside their slabjacking. But that's not accurate for a lot of jobs, and it's not the kind of company we want to be. If your slab settled because of poor initial compaction, disturbed soil from past excavation or construction, or tree root activity, a drainage fix isn't going to do anything for you, and we're not going to recommend spending money on one just because it sounds thorough.
This same honesty is baked into our one-year, no-questions-asked warranty. If an area we've lifted experiences settlement again within that first year, we'll come back out and address it. We also try to identify any ongoing drainage or erosion concerns upfront, because lifting the concrete doesn't eliminate an outside water source.
What this looks like in practice
A driveway with a downspout draining directly onto the slab edge for years. Here we'd likely recommend redirecting or extending that downspout, sometimes alongside regrading or a small French drain, in addition to raising the settled sections.
A walkway that's settled unevenly with no clear water source nearby, maybe due to tree roots or older backfill. In this case, slabjacking alone is usually the full fix.
A basement floor with grading around the foundation pushing water toward the house. Regrading or a French drain paired with slab stabilization is common here.
A patio or pool deck settling in one corner where the surrounding landscaping was recently regraded or excavated. This is often a soil disturbance issue rather than a drainage one, and typically just needs a lift.
A driveway or walkway that's settled just enough to reverse its slope, so water that used to run off now pools or runs toward the house. In cases like this, lifting and re-leveling the concrete is often the whole fix, since the settling was the drainage problem.
What To Take Away
Drainage fixes and slabjacking aren't competing solutions, they're different tools for different problems, and a lot of properties genuinely only need one of them. We'd rather walk you through which one actually applies to your situation than sell you on both because it sounds like the safer recommendation. If you're weighing a drainage project against a concrete repair, or trying to figure out if you need both, get in touch and we'll give you a straight answer.
FAQ
Can a French drain or other drainage fix address sunken concrete?
No. Drainage fixes like French drains, downspout extensions, or regrading redirect water to prevent future erosion or pooling, but they don't lift concrete that has already settled or refill a void that's formed underneath a slab.
Can slabjacking fix a drainage problem?
Sometimes. If a settled slab is causing water to pool or run the wrong direction, lifting and re-leveling it can restore proper slope and solve that specific drainage issue. If there's a separate, active water source involved, like a downspout or poor grading, that typically needs its own fix alongside the concrete work.
Do I need to fix drainage before I get my concrete lifted?
Not necessarily. It depends on what's causing the settling. If there's no ongoing water issue involved, a separate drainage fix may not be needed at all. Our team can help you figure out which situation applies during a free inspection.
How do I know if I need both a drainage fix and slabjacking?
The clearest sign is having both a settled slab and a visible, ongoing water source nearby, like a downspout, poor grading, or a low spot that consistently sends water toward the concrete. If you're only dealing with one of those two issues, you likely only need one fix.
If you're not sure whether your property needs a drainage fix, slabjacking, or both, schedule a free inspection and we'll walk the property with you and tell you exactly what we're seeing, no upsell, just an honest read.
