Paving · Compare
Crack sealing vs pothole patching: which asphalt repair to run
Crack sealing is preventive and keeps water out of sound pavement; pothole patching is corrective and fixes holes already broken through.
Short answer
Run crack sealing when the pavement is still sound and the cracks are the only problem; run pothole patching once material has already broken away and left a hole. The single deciding factor is whether the pavement is intact or already failed: crack sealing is preventive work that keeps water out of good asphalt, while patching is corrective work that puts material back where the surface, and often the base, is gone. On any real lot you do both, in order: crack seal and patch the failed sections, because a hole feeds water into the pavement around it and a sealed crack keeps the next hole from forming.
Crack sealing vs Pothole patching: side by side
| Factor | Crack sealing | Pothole patching |
|---|---|---|
| What it does | Fills working cracks with flexible hot-pour sealant to keep water and UV out of sound pavement | Puts material back into a hole where asphalt broke away over a weakened or failed base |
| When it applies | Pavement still structurally sound; cracks roughly 1/8 in to 1 in wide | Surface already broken through; sometimes base washed out or pumping |
| Type of work | Preventive / preservation, protects existing strength | Corrective repair, restores what is lost |
| Upfront cost | Low, priced per linear foot of crack (routed seal costs more than clean-and-fill) | Higher per spot; full-depth over corrected base costs many times a throw-and-roll |
| Lifespan | Several years for flexible hot-pour in working cracks | Cold patch 1 to 2 seasons; hot mix 10 to 15 years placed and compacted right |
| Install speed | Fast production; clean, dry, rout, pour hot in one pass | Throw-and-roll takes minutes; semi-permanent or full-depth takes hours |
| Base failure | Does nothing for a failed base; useless on alligator cracking | Full-depth patch cuts to sound base and rebuilds; the only fix that addresses cause |
| Standards | ASTM D6690 hot-pour sealant; PCI survey (ASTM D6433) guides timing | FHWA/SHRP method guidance; project and DOT spec govern materials |
| Best use | Good-to-satisfactory lots caught early, on a re-seal cycle | Isolated holes and failed sections; safety fixes in winter, lasting repair in good weather |
Which should you pick?
Choose Crack sealing when
- Pavement is still sound and cracks are the main distress, roughly 1/8 in to 1 in wide
- You are catching the lot early, high on the deterioration curve, before holes form
- Cracks are working cracks (moving with the seasons) that need flexible hot-pour, not a rigid filler
- You want the cheapest per-foot work that delays the expensive overlay
Choose Pothole patching when
- Asphalt has already broken through and left a hole that is a hazard or a water entry point
- A section shows alligator cracking or a soft, pumping spot, meaning the base has failed and needs full-depth repair
- You need a fast winter or emergency safety fix (throw-and-roll or bagged cold patch) with a permanent repair scheduled later
- A recurring hole keeps coming back, the sign a surface fix is the wrong tool and drainage or base must be corrected
Bottom line
It depends on the condition of the pavement, not on preference: crack sealing preserves asphalt that is still sound, and pothole patching repairs asphalt that has already failed. They are not competing choices but two stages of one maintenance program. On a real lot the sequence is crack seal, then patch the failed sections, then sealcoat, then stripe. The deeper judgment call sits inside patching itself: whether the base under a hole is sound (a surface patch holds) or gone (only full-depth over corrected base lasts). Seal early and you keep water out before it makes holes; skip it and you end up patching, which costs more and never buys back the pavement the water already ruined.
FAQ
Is crack sealing or pothole patching better?
Neither is better; they fix different problems. Crack sealing is preventive, keeping water and UV out of pavement that is still sound so it lasts longer. Pothole patching is corrective, putting material back where asphalt has already broken away. On most lots you do both, sealing cracks early to slow the damage and patching the sections that have already failed.
Can crack sealing prevent potholes?
Yes, that is much of its value. Potholes start when surface water gets through cracks into the base, softens it, and traffic breaks up the unsupported asphalt. Sealing working cracks keeps that water out, so crack sealing and good drainage prevent far more potholes than patching ever fixes. It only works on sound pavement, though; it does nothing for a base that has already failed.
What order do you crack seal and patch a lot?
Crack seal first, then patch the structural failures, then sealcoat, then stripe last. Cracks get handled before anything coats over them, and alligatored or base-failed sections get cut out and rebuilt as patches rather than sealed over. A fresh patch should be in place before the seal so the coat carries across it.