Seal Isolated, Working Cracks
Flexible sealant is designed for active cracks between 1/4 inch and 1.5 inches, where it can move with the pavement and keep water out of the aggregate base.
Guides
Is it important to seal cracks in your asphalt pavement?
Peoria Asphalt recommends sealing isolated asphalt cracks because flexible sealant blocks water, slows oxidation, and helps prevent damage from spreading into the pavement base. In Peoria, intense sun and monsoon rain make crack width, pattern, preparation, and timing especially important.
Quick Summary
- Yes. Seal isolated cracks between 1/4 inch and 1.5 inches wide to limit water intrusion and base erosion.
- Patch or mill cracks wider than 1.5 inches and alligator-pattern damage instead of relying on sealant alone.
- Clean and dry cracks before applying flexible hot-pour sealant, ideally in spring or fall before monsoon or winter moisture.
- Professional crack sealing typically lasts 3-7 years and costs about 5-10% of full replacement while adding 3-7 years of service life to pavement in fair condition.
Three Rules for Crack Sealing
Let Width and Pattern Choose the Repair
A crack wider than 1.5 inches or a clustered alligator pattern points to patching, milling, or full-depth repair rather than sealant alone.
Prepare the Crack Before Sealing
Route or wire-brush the opening, remove vegetation and debris with compressed air, dry it completely, and apply hot-pour polymer-modified rubberized sealant with slight overbanding.
What to Inspect Before Sealing
An Isolated 1/4-Inch Pavement Crack
A single crack at the sealing threshold with sound pavement on both sides. This is the condition where timely sealing can stop water from reaching the base.
Alligator Cracking That Needs Patching
Interconnected cracks forming small pavement blocks rather than one clean opening. The pattern matters because sealant cannot correct the underlying base failure.
A Clean, Dry Crack Ready for Hot Pour
Debris removed from the crack walls and the opening fully dry before application. Clean contact surfaces help flexible material bond and move with the pavement.
Crack-Sealing Decision Snapshot
Measure Width and Map the Pattern
An isolated opening from 1/4 inch to 1.5 inches is a sealing candidate; wider or interconnected damage needs a different repair.
Account for Traffic, Sun, and Movement
Traffic volume, direct sun, prep quality, and thermal expansion affect performance; Peoria pavement can move through 40-plus degree daily temperature swings.
Act Before Seasonal Moisture Arrives
Use spring after the last frost risk or fall before winter moisture; do not leave open cracks for monsoon rains in July and August.
Do Not Rush Prep or Cure Time
Never seal a damp, dirty opening or cover fresh sealant too soon; allow a minimum of two weeks before an overlay or additional treatment.
Crack-Sealing Planning Matrix
| Crack Condition | What It Indicates | Recommended Action |
|---|---|---|
| Under 1/4 inch | A small hairline crack that may not need sealing yet. | Monitor it and keep the pavement edge and drainage clear. |
| Isolated, 1/4 to 1.5 inches | A sealable opening if the surrounding pavement is sound. | Clean and dry the crack, then apply flexible hot-pour sealant. |
| Wider than 1.5 inches | The opening is beyond the recommended sealing range. | Evaluate patching or a full-depth repair. |
| Alligator crack pattern | Clustered cracking can signal base or structural failure. | Use patching or milling rather than sealant alone. |
| Open cracks before seal coating | A surface coating will reopen over an untreated crack. | Seal first and allow at least two weeks before another treatment. |
Why Timely Sealing Works
Crack sealing is preventive maintenance, not a structural repair. Closing an isolated working crack limits water intrusion into the aggregate base and slows UV-driven oxidation; without action, a hairline opening can become edge or block cracking within a season or two. Crack sealing should come before seal coating, while seal coating every 2-3 years plus drainage and vegetation control can help slow new crack formation.
What Changes Crack-Seal Performance
Material grade, crack movement, cleaning, dryness, traffic, and sun exposure all affect longevity. Hot-pour rubberized or polymer-modified material flexes with active cracks, while DIY cold-pour products may fail within one to two seasons. Professional applications typically last 3-7 years, and pavement research has pushed median time to failure past 7.7 years under favorable conditions.
Common Follow-Up Questions
How often should cracks be checked? Most Peoria driveways and lots need inspection or sealing every 18-36 months, while heavily used commercial surfaces may warrant an 18-month cycle. How much does the work cost? Labor typically runs $0.60 to $1.75 per square foot or $0.35 to $1.00 per linear foot, and a standard two-car driveway crack seal and seal coat often totals near $1,000 with preparation included. Can small cracks be handled with a DIY kit? A few isolated hairline cracks may be manageable, but professional preparation uses routing tools or wire brushes, compressed-air blowers, hot-pour melters, and pour pots or wands.
Ask a Local Pro
Unsure Whether to Seal or Patch?
Share the crack width, pattern, pavement condition, property type, and traffic level. A local asphalt team can inspect the surface and explain whether sealing, patching, or a broader repair fits the damage.