Is the crack hairline and level?
Clean and measure it. A narrow, dry, level crack with solid edges is the best candidate for driveway crack filler.
Driveway troubleshooting
Driveway Cracked? Check Width, Offset, and Drainage First
A cracked driveway is either a stable surface crack or a sign the slab is moving. Check width, vertical offset, firm edges, and runoff before buying filler.
Good clue: a narrow, dry crack with level sides and firm edges is usually repairable. A lip, hollow sound, widening gap, or wet edge points to support, drainage, heave, or settlement instead.
Sweep first, lay a straightedge across the opening, measure the widest point, and look for water at downspouts, edges, low spots, and transitions.
Don’t start with: Do not coat the driveway or force filler into every opening before you know why the crack opened. Sweep the crack, check for a lip with a straightedge, and look for wet edges, hollow sound, or washed-out soil first. Those clues usually mean a surface patch will reopen.
Crack is narrow and level?Clean it, measure it, confirm solid edges, and match filler only after it is dry.
One side is higher or lower?Treat it as movement first and skip cosmetic patching until support and drainage are understood.
Stop patching if
- One side of the crack is raised or dropped enough to catch a shoe, shovel, or tire.
- A section rocks, sounds hollow, pumps water, or has a visible void below the edge.
- Water disappears into the crack or washes soil away along the driveway side.
- Cracks are spreading into a web, a soft spot, a pothole, or broken loose chunks.
- Damage reaches a garage slab, foundation area, public sidewalk, steps, or a steep transition.
Last reviewed: 2026-06-30
60-second cracked driveway sorter
Does a straightedge show a lip?
Pause the repair. Vertical offset points to settlement, heave, root pressure, or base movement.
Are the edges crumbling?
Treat it as edge damage first. A thin filler will not rebuild broken concrete shoulders.
Does water collect there?
Correct the water route before patching, especially near downspouts, low spots, and driveway edges.
Does the area sound hollow?
Do not fill it. Hollow sounds, voids, or rocking sections mean the support below needs attention.
Is it asphalt, concrete, or an old patch?
Identify the surface before buying material. Concrete patch and asphalt crack products are not interchangeable.
Read the crack before buying repair material
Use three views: the full crack pattern, a close look at width and edge condition, and the surrounding driveway slope and drainage path.
Before you buy crack filler or concrete patch
Match the material to the exact diagnosis before you buy anything. Measure the crack, check both sides with a straightedge, confirm the surface type, and make sure the crack is dry and supported. Crack filler belongs on stable narrow openings. Concrete patch belongs on small broken edges in sound concrete. Neither fixes a moving, sinking, hollow, or water-fed section.
Map the crack before choosing filler
The first pass is visual and light-touch. You are looking for the difference between a stable surface crack and a driveway section that is moving.
- Sweep the area clean enough to see the full crack, including small branches at the ends.
- Look for one main line, several connected cracks, crumbling edges, loose chunks, and old patch material.
- Lay a straightedge across the crack in several places and look for a height difference.
- Mark the ends with painter tape or chalk if you want to check whether it grows after rain or a freeze.
- Keep vehicles off any area that rocks, breaks under light pressure, or creates a sharp trip edge.
Separate stable cracks, offset slabs, and failing sections
Let the worst visible clue set the repair path. A level hairline crack can be a maintenance job; offset, hollow, or washed-out concrete needs a support or drainage answer first.
- Width matters, but level and support matter more.
- A narrow crack with solid edges can be a maintenance repair.
- An offset crack is a movement clue even when the opening is small.
- Crumbling, hollow sounds, and water pumping point below the surface.
| What you see | Likely meaning | Next move |
|---|---|---|
| Hairline or narrow crack, both sides level | Stable surface crack or shrinkage crack | Clean, dry, measure, and consider driveway crack filler. |
| One side is higher or lower | Settlement, heave, root pressure, or base movement | Stop treating it as a cosmetic crack and inspect support and drainage. |
| Edges are solid but slightly chipped | Localized edge damage around a stable crack | Use a concrete patch path only if the concrete section is still supported. |
| Edges crumble or chunks break free | Surface deterioration or a failing repair area | Remove loose material and reassess whether the repair zone is too large. |
| Crack holds water or lines up with erosion | Runoff or washout is feeding the failure | Fix drainage first, then patch only if the surface is stable. |
| Hollow sound, rocking section, or visible void | Lost support below the driveway | Skip filler and get the support problem evaluated. |
Clean and measure only stable cracks
Cleanup is part of diagnosis. It should reveal the real width and edge condition without turning a weak area into a larger break.
- Sweep first, then remove weeds, grit, and loose pieces by hand or with a small brush.
- Measure the widest point after the debris is out, because packed dirt can hide a larger opening.
- Avoid aggressive chiseling unless you already know the repair material requires it and the concrete is sound.
- Do not pour water into a crack that might have a void below; use only light rinsing when the area can dry fully.
- If the edges keep breaking away, stop and treat the problem as surface deterioration or support loss.
Fix water clues before surface repair
A cracked driveway often reopens because the water path was left alone. Check roof runoff, low spots, soil erosion, and the driveway edge before spending money on repair material.
- Watch where downspouts, roof valleys, sprinklers, and yard runoff send water during a normal rain.
- Look for soil gaps, muddy edges, exposed aggregate, or water tracks beside the cracked area.
- Check whether the crack sits in a low spot that stays wet longer than the rest of the driveway.
- Correct obvious water discharge before sealing the crack, even if the crack itself looks minor.
- If water comes from below or pumps through the crack, stop patching and investigate the hidden source.
What not to do
Most short-lived driveway crack repairs fail because the crack was filled before the driveway was diagnosed.
- Do not coat the whole driveway to hide one crack that is moving.
- Do not overfill a crack into a raised bead that catches tires, shovels, or shoes.
- Do not use concrete patch on asphalt or asphalt crack filler on concrete unless the product explicitly supports that surface.
- Do not bridge an active control joint or expansion joint with rigid patch material.
- Do not keep adding filler to a crack that reopens after every winter or heavy rain.
- Do not ignore a crack that has become a trip edge near a sidewalk, garage, or main walking path.
Tools You May Need
These tools help you inspect and prep a stable crack. They do not make an offset, hollow, or unsupported driveway section patchable.
Stiff push broom
Helps when: Use it to clear loose grit and reveal the full crack pattern before measuring.
Skip it when: Skip repair prep when sweeping exposes loose chunks, soft material, or a void below the edge.
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Straightedge and level
Helps when: Lay it across the crack to find raised or dropped edges that change the repair path.
Skip it when: Skip filler when the straightedge rocks or shows a clear height difference.
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Tape measure
Helps when: Use it to record crack width and track whether the opening is changing.
Skip it when: Skip buying product from width alone if the driveway is also offset, hollow, or wet from below.
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Wire brush
Helps when: Use it to remove loose dust and grit from a stable crack before repair.
Skip it when: Skip aggressive brushing when the edges crumble or the crack keeps widening as you clean.
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Caulk gun
Helps when: Use it for tube-style driveway crack filler after the crack is confirmed stable and dry.
Skip it when: Skip it when the crack is offset, actively wet, too wide for the product, or tied to a void.
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Replacement Parts
Buy repair material only after the crack type is clear. Match surface type, crack width, cure time, weather window, and whether the driveway will carry vehicle traffic soon.
Driveway crack filler
Helps when: Use it when the crack is narrow, dry, level, supported, and matched to the driveway surface.
Skip it when: Skip it when one side is raised or dropped, water is feeding the crack, or material disappears into a void.
Compare driveway crack fillers on Amazon
Concrete patch material
Helps when: Use it for shallow spalled concrete edges around a stable crack in otherwise sound concrete.
Skip it when: Skip it when the driveway is asphalt, the slab is offset, the section rocks, or the repair would feather onto weak material.
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FAQ
Is a cracked driveway normal?
Small hairline cracks can be normal with age, shrinkage, and weather exposure. A crack becomes more concerning when it widens, develops a height difference, or appears with sinking, heaving, hollow sounds, or crumbling edges.
Can I just fill a driveway crack and be done?
Only if the crack is stable, narrow, level, clean, and dry. If the driveway section is moving, losing support, or getting wet from below, filler is usually temporary.
How do I know if my driveway crack is serious?
Look for one side higher or lower than the other, multiple connected cracks, hollow sounds, visible voids, standing water, or recurring movement after rain or winter. Those signs point beyond a simple surface crack.
Should I use concrete patch or driveway crack filler?
Use driveway crack filler only after the opening is narrow, clean, dry, level, and stable, and match it to the driveway surface. Reach for concrete patch when the concrete around a small broken edge is still sound. If you find settlement, heave, hollow sections, or active washout, neither product is the fix.
What causes a driveway crack to keep coming back?
Common reasons include water undermining the base, freeze-thaw movement, poor compaction, heavy loads, root pressure, or a repair applied to a dirty or moving crack.
Does a cracked driveway mean the slab is sinking?
Not always. A level hairline crack can be minor. Sinking is more likely when a straightedge shows one side lower, the section sounds hollow, water collects there, or cracks are spreading into broken pieces.
Can water under the driveway cause cracks?
Yes. Runoff, downspouts, clogged drains, poor grading, and edge erosion can remove support below the driveway. If water is part of the pattern, correct it before sealing the crack.
When should I call a professional for a cracked driveway?
Call a pro for offset edges, sinking or heaving, a visible void below the crack, fast-spreading damage, or a driveway that may need lifting, base repair, or section replacement.
How this guide was built
Repair Riot built this page around visible driveway clues: crack width, vertical offset, edge soundness, hollow support, drainage paths, freeze-thaw movement, and where a surface repair becomes a support or drainage problem.
- FHWA: Pavement Preservation Checklist Series — pavement crack sealing, patching, and preservation context
- DOE Energy Saver: Moisture Control — why moisture control and drainage matter around exterior materials
- EPA: Soak Up the Rain — stormwater runoff and residential drainage context