Why Is My Concrete Pulling Away From My Garage?
The gap between your driveway and garage floor didn't move because the garage moved. The driveway settled away from a stationary footing. Here's how to confirm it and lift the slab back where it belongs.
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Problem overview
What's actually happening.
The garage is anchored to a footing that extends below the frost line. The driveway is a floating slab on soil. When water gets under the driveway near the garage, the driveway drops — and the garage doesn't. The result is that widening gap.
In Spokane this is one of the most common driveway problems we see, especially on homes with a downspout at a garage corner or with a driveway that slopes back toward the house.
The fix isn't complicated. Lift the driveway back up to meet the garage floor, fill the gap under the slab so it can't drop again, and correct the drainage that caused it.
For the underlying service, see driveway leveling. Serving Spokane, WA and the surrounding Inland Northwest. Ready to skip ahead? Request a free estimate.
Signs to watch for
How this problem shows up.
A visible gap or step between the driveway and garage floor
The driveway is now noticeably lower at the garage edge.
Water running into the garage under the door
The driveway now slopes toward, not away from, the garage.
Cracks at the driveway edge near the garage
The unsupported edge is fracturing.
The garage door seal doesn't sit flush anymore
The driveway height has dropped below the seal's design range.
A noticeable bump when driving in or out
The transition is no longer flush.
Water pooling right at the driveway/garage seam
Concentrated water at the very spot where more settlement will happen.
Common causes
Why it happens in the Inland Northwest.
Spokane's freeze/thaw cycles, clay-and-silt soils, and heavy seasonal runoff produce a fairly predictable set of root causes.
Downspout at the garage corner
By far the most common cause. Concentrated roof water erodes fill under the driveway edge.
Poor perimeter grading
Ground sloping toward the garage pushes surface water into the joint.
Freeze/thaw cycling at the edge
Wet subgrade at the transition freezes unevenly, dropping the driveway a fraction each winter.
Backfill still compacting years after construction
The driveway is sitting on the tail end of long-term settlement.
A cracked driveway losing structural continuity
Once the edge is cracked off, that piece drops faster than the rest of the slab.
How to determine severity
Read your slab like a pro.
A quick self-triage. When in doubt, request a free on-site walkthrough.
- Under ¼ inch step: cosmetic. Easiest time to correct.
- ¼ to 1 inch step, water starting to enter the garage: moderate. Fix before the next wet season.
- 1+ inch step, water regularly reaching the garage floor: high priority — you're now moving water into a finished space.
- The garage floor itself is also cracking or dropping: two related problems — see the garage floor page.
- The driveway edge is broken off entirely: replace or patch that piece plus lift the rest.
Not sure how bad it is?
Get a free walkthrough before it gets worse.
We'll measure the drop, check for voids, evaluate the drainage, and give you an honest recommendation — including whether it's a leveling job or something else.
Why waiting makes it worse
Settlement doesn't fix itself.
Every cause listed above keeps working whether or not the slab is addressed.
- Water entering the garage damages stored items, drywall, and the garage floor slab.
- The gap widens every freeze/thaw cycle.
- Ice at the garage entrance becomes a slip hazard every winter.
- The driveway edge continues to break, turning a lift into a partial replacement.
- The garage door seal wears out from sealing against uneven concrete.
Repair options
What are your choices?
An honest comparison — the right fix depends on the slab, the cause, and the goal.
Polyurethane foam leveling
Foam lifts the driveway edge back flush with the garage floor and fills the void under the slab.
Drainage correction at the corner
Extend the downspout, regrade the side yard, or add a French drain. Almost always paired with leveling.
Mudjacking
Works, but heavier and slower to cure than foam.
Partial driveway replacement
Reserved for cases where the edge has broken off in pieces that can't be lifted.
Why polyurethane foam usually wins
The best fit for the vast majority of Spokane slabs.
- Cures in about 15 minutes — you can drive or walk on the slab the same day.
- Closed-cell foam doesn't wash out or absorb water like sand or slurry-based methods.
- Injection holes are dime-sized, not the golf-ball ports left by mudjacking.
- Lightweight — adds roughly 4 lbs per cubic foot vs. 100+ lbs for mud slurry, so it won't re-settle weak soil.
- Stabilizes the underlying soil at the same time it lifts the slab.
For a full comparison, see polyurethane foam vs. mudjacking in the Learning Center.
When replacement may be necessary
The honest cases where leveling isn't the right call.
- The slab is crumbling, spalling apart, or shattered with structural cracks — there's no solid piece left to lift.
- The concrete is very thin (below ~3 inches) and would crack under the lift pressure.
- You're changing the layout — widening a driveway, moving a patio, adding a new pour.
- Reinforcement is severely rusted and the slab is delaminating.
More detail in concrete leveling vs. replacement.
Frequently asked questions
Straight answers from Spokane homeowners.
- Does this mean my garage is moving?
- Almost never. The garage is on a footing; the driveway is on floating fill. The driveway is moving, not the garage.
- How high can foam lift the driveway edge?
- Several inches when needed. Most cases are ½ to 1½ inches.
- Do I need to fix the downspout first?
- Ideally at the same time. Lifting without correcting the water source sets up a repeat.
- Can I drive on it the same day?
- Yes. Foam cures fast enough that most driveways are back in service the same afternoon.
- What about the garage door seal — will it work again?
- Once the driveway height is restored, the seal returns to its designed height and closes flush.
- Will there be visible patches on the driveway?
- Only dime-sized injection holes, patched with matching material. Much cleaner than mudjacking's 2" holes.
- Is this covered by homeowner's insurance?
- Usually no — settlement is typically excluded. See the related article for detail.
- Do you service Spokane Valley and Post Falls?
- Yes — this is one of the most common calls we take in the Inland Northwest.
Related services
Explore the services that solve this problem.
Considering budget? Driveway leveling cost in Spokane.
Related problems
Other homeowner questions we hear.
From the Learning Center
Related reading before you request an estimate.
Free estimate — no obligation
Fix it before the next wet season.
Settlement compounds. Every rainstorm and freeze/thaw cycle makes the void bigger. Get an honest walkthrough now and know exactly what your options are.
Lift it — don't replace it.
Have questions about your concrete? Need advice? Want a free estimate? We're here to help. Concrete leveling saves the slab you already have, at a fraction of the cost of replacement.
- Often less costly and less disruptive than tear-out and replacement
- Repair before replacement when appropriate
- Modern concrete lifting methods
- Clear recommendations — no pressure, no upsells
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