Fill Stable Cracks
Use crack filling for stable, non-working cracks. Cold or warm asphalt emulsion, tar, or liquid filler plugs the opening and slows water intrusion, but it is reactive maintenance rather than a structural fix.
Guides
What is the difference between crack filling and crack sealing?
Surprise Asphalt explains the practical difference: filling plugs stable cracks, while sealing uses a flexible material for cracks that open and close. In Surprise's 110-plus degree summers and monsoon downpours, matching the repair to crack movement helps avoid a short-lived result.
Quick Summary
- Fill stable, non-working cracks with less than 2.5 mm of horizontal movement; filling typically lasts 1-2 years.
- Seal working cracks that expand and contract; properly applied sealing can last up to 8 years.
- Crack filling costs roughly $0.75-$2.50 per linear foot, while sealing costs more because of routing, hot-kettle equipment, and material grade.
- Filling commonly uses cold-pour tar or asphalt emulsion; sealing uses hot-applied rubberized asphalt meeting ASTM D6690.
Crack Filling or Crack Sealing?
Seal Moving Cracks
Use crack sealing for working cracks that open and close with temperature. Hot-applied polymer-modified asphalt bonds to the crack walls and flexes with seasonal expansion and contraction.
Measure Crack Movement
Measure width and movement before choosing a method. True sealing routes a reservoir, clears debris with compressed air, applies hot rubberized sealant by wand or pour pot, and finishes with a squeegee or sand blotting; filling usually needs cleaning, pouring, and leveling without routing.
What the Two Repairs Should Show
Stable Hairline Crack for Filling
A minor surface crack with no visible seasonal movement, such as the stable cracking described on some driveways placed within the last decade. This image helps make the narrow, non-working condition easy to recognize.
Routed Working Crack During Hot-Pour Sealing
A routed reservoir being filled from a specialized kettle while the rubberized sealant is hot. The prepared crack walls and flexible seal make this process visibly different from a quick fill.
South-Facing Driveway Under Thermal Stress
A thermal crack on a south-facing Surprise driveway exposed to full Arizona sun. Comparing it with a shaded area helps explain why exposure and heat-cool cycling can change the recommendation.
Crack Repair Answer Snapshot
Movement Under 2.5 Millimeters
A crack with less than 2.5 millimeters of horizontal movement is considered non-working and is the proper candidate for filling. Misclassifying movement is a common reason a repair fails within months.
Material Must Match Movement
Rigid or less flexible filler can crack again beside a moving repair. Rubberized sealing compounds stretch and compress with working cracks, helping resist failure at the repair edge.
Traffic Sets the Interval
Commercial lots may need resealing every 1-2 years under heavy traffic, compared with a typical 3-year cycle for residential driveways. Retail and HOA work may be scheduled overnight or early morning to reduce parking disruption.
Sealcoat Is Not Crack Repair
Driveway sealcoat protects the surface from UV exposure and oxidation, but it does not fill gaps or flex with working cracks. Fill or seal cracks first, then apply sealcoat for uniform surface protection.
Crack Repair Planning Matrix
| Decision Factor | Crack Filling | Crack Sealing |
|---|---|---|
| Crack behavior | Stable, non-working; under 2.5 mm of movement | Working; opens and closes with temperature |
| Material | Cold or warm asphalt emulsion, tar, or liquid filler | Hot-applied polymer-modified rubberized asphalt meeting ASTM D6690 |
| Preparation | Clean, pour, and strike level; routing is generally unnecessary | Route a reservoir, clean with compressed air, hot-pour, then finish |
| Best fit | Hairline or fatigue cracks where short-term cost matters | Thermal, reflective, or expansion cracks needing flexibility |
What the Difference Means
Crack filling is a budget-conscious, temporary treatment for stable pavement; crack sealing is a flexible, longer-term treatment for active movement. Filling slows water intrusion, while sealing bonds to routed crack walls and moves with the asphalt instead of fighting seasonal expansion.
Heat, Traffic, and Site Conditions
Surprise pavement can experience 115°F July surface conditions and near-freezing January nights; summer surfaces may also exceed 140°F. Crack width, traffic, sun exposure, and annual heat-cool or freeze-thaw cycles all matter, so a shaded driveway behaves differently from one baking in full sun from May through September. Marley Park, Sun Village, Bell Road, Grand Avenue, and properties across greater Maricopa County share regional heat but can carry very different traffic loads and pavement conditions.
Common Follow-Up Questions
Lighter-use residential driveways often go 3 years or more between sealing treatments, while residential crack sealing is typically low-disruption and completed in a single visit. Sealcoat cannot replace crack filling or sealing because it lacks the depth penetration and flexibility needed to bridge a gap. If deterioration has reached the base course, patching or full-depth reclamation may be more appropriate than either crack treatment. Filling is temporary rather than permanent, and a non-working crack that begins moving will need to be reassessed.
Compare Your Options
Need Help Choosing a Crack Repair?
Document where cracks open and close, how traffic crosses them, and whether water is reaching the base. A local asphalt professional can measure crack width and movement, identify when deeper pavement repair is needed, and provide a written scope before work begins.