So, you’ve noticed your floor isn’t quite what it used to be.
Maybe it slopes toward one corner. Maybe your garage floor looks like it’s trying to hug the ground. Or maybe your laundry room tile has started popping up like it’s auditioning for a trampoline act.
Whatever the symptom, the diagnosis is usually the same: sunken concrete. And your search history now looks something like: “How to level concrete floor” + “DIY concrete repair” + “foam jacking gone wrong.”
We get it. You’re handy, you’re motivated, and you’re not afraid to get your boots dirty. But before you head out to rent equipment or start mixing concrete in your driveway, let’s talk about the most common mistakes people make when trying to level a concrete floor, and how to avoid them.
Because while a sunken slab might look like a weekend project, getting it wrong can lead to bigger problems, more costly repairs, and, occasionally, language your neighbors weren’t ready to hear over the fence.
For more information, see Professional Basement Floor Leveling Methods You Should Know.
Mistake #1: Thinking a Bag of Concrete Will Fix the Problem
Let’s start with the classic.
You’ve got a low spot in the floor, so you grab a bag of self-leveling compound and figure you’ll just fill it in. Easy, right?
Wrong.
Adding more concrete on top of an already sunken slab doesn’t fix the problem, it just masks it. Like putting new shingles on a sinking roof.
The real issue is usually under the slab: voids, settled soil, or poor compaction. If you don’t address what’s going on beneath the concrete, that shiny new layer will start cracking and sinking too. And now you’ve got two layers to fix.
Better Option: Use a method like polyurethane lifting (aka foam jacking) to fill the voids and lift the entire slab back to where it belongs…before you worry about topping it off.
Mistake #2: Using the Wrong Repair Method for Indoors
A lot of folks confuse slab leveling with mudjacking, and then wonder why their garage feels damp for weeks afterward.
Mudjacking involves pumping a slurry of soil, water, and cement under the slab. It’s heavy, it adds moisture, and it takes days to cure. It also means drilling holes the size of a coffee mug in your floor.
That’s not ideal for indoor use, especially if you care about mold, finish flooring, or clean air.
Better Option: For interior slabs, polyurethane foam (like our PolyLevel® system) is the cleanest, driest, and fastest option. It’s injected through tiny holes (about the size of a dime), cures in 15 minutes, and won’t introduce moisture into your home.
For more information, see Comparing All Concrete Leveling Solutions Side-by-Side.
Mistake #3: Not Understanding Why the Concrete Sank
You can’t fix what you don’t understand.
Concrete doesn’t sink just to be difficult. It sinks because something underneath it gave way…maybe it’s eroded soil, poor drainage, or tree roots disturbing the subgrade.
If you don’t fix the underlying cause, your slab will keep sinking… and cracking… and driving you nuts.
Better Option: Have a professional assess the soil conditions and drainage patterns around your home. At Ogburn, we include this in every inspection, because a good repair starts with the right diagnosis.
Mistake #4: Overcorrecting the Lift
Here’s one that gives DIYers nightmares.
You’re using jacks or foam or some other method to lift the slab, and then suddenly – BOOM – you’ve lifted the thing too far. Now the floor is tilted in the opposite direction and your garage door won’t close.
Concrete is heavy, but it’s also fragile. Lift it too quickly or unevenly, and you risk cracking the slab or damaging interior finishes.
Better Option: We use precision injection and laser levels to lift the slab gradually, inch by inch, not foot by foot. No guessing. No “winging it.” Just solid, controlled slab leveling.
Mistake #5: Ignoring Cracks and Control Joints
Let’s say you do manage to lift the slab correctly. Great. But what about all those cracks?
If you skip sealing them, or if the old control joint sealant is deteriorated, water can still get in…creeping below the slab, eroding the soil, and starting the whole mess over again.
Better Option: Use a flexible, waterproof joint sealant like NexusPro®. It’s designed to expand and contract with temperature and soil movement, keeping your concrete protected long after the lift.
It also looks good. No clumpy caulk or gray goo. Just clean lines and peace of mind.
Mistake #6: Leveling the Wrong Area
This one’s subtle, but important.
Sometimes people see a low slab and assume it needs to be lifted. But in reality, the surrounding slabs have settled too, just not as noticeably. So they level one section, and it ends up higher than the rest.
The result? A bumpy Frankenstein floor with new trip hazards.
Better Option: Let a professional evaluate the entire slab system. We look at how all the pieces fit together, not just the one that’s bothering you right now.
Mistake #7: Underestimating Structural Damage
Here’s the hard truth: Not all slab problems are cosmetic.
In some cases, a sunken slab might be tied to foundation movement or structural failure. If you lift the concrete without addressing those deeper issues, you’re just throwing good money after bad.
Better Option: At Ogburn, we don’t just lift concrete, we also evaluate load paths, foundation conditions, and overall home movement. If you’ve got deeper structural issues, we’ll tell you, and we won’t sell you a fix that won’t last.
Mistake #8: Trying to DIY Structural Repair
Look, we love a good DIY project as much as the next guy. But foam lifting, structural repair, and leveling concrete floors isn’t the kind of thing you want to guess at.
Better Option: Let the pros handle it. We’ve got the tools, the training, and the ten-year warranty to back it up.
Final Thoughts: Know When to Call In Reinforcements
Knowing how to level a concrete floor is one thing. Actually doing it right is another.
So if you’re staring at that sunken garage, that sloped basement floor, or that crack that keeps getting wider, don’t wing it. Avoid the mistakes. Trust the pros. And get it fixed once, the right way.
Because at the end of the day, leveling concrete isn’t about concrete, it’s about safety, stability, and peace of mind.
Ready to Lift It Right?
We’ve been fixing sunken concrete across Virginia for over 30 years, and we’ve seen (and repaired) every DIY mistake in the book.
If you’re ready for clean, safe, long-lasting results backed by a real warranty, let’s talk.
Call us at 1-804-409-8009 or schedule your free inspection online.
You’ll Get:
- A full inspection of your concrete and underlying soil
- A custom plan using PolyLevel foam and NexusPro sealant
- Results you can see – and walk on – the same day
