Pothole Repair Decision Tree: Cold Patch vs Hot Mix vs Overlay
2026.11.04
Why the Wrong Repair Fails Fast
The most expensive pothole repair is the one that has to be done again next winter. Slapping cold patch into a deep alligatored zone, or milling and overlaying a single isolated hole, wastes money. Walk the site, ask four questions, and pick the repair that matches the defect.
The 4-Question Decision Tree
- Is the failure isolated or widespread? Isolated holes < 5 m² → patch. Continuous distress > 50 m² → overlay or deeper rehabilitation.
- Is the subgrade stable? Lift the asphalt; if subgrade is firm and dry → surface patch. If subgrade is soft, wet or pumped → full-depth repair with base replacement.
- Can you get hot mix? Yes, during paving season → hot-mix patch. No (remote site, winter, night) → cold patch.
- How long must it last? Temporary winter fix → cold patch. 1-3 year service → hot-mix pothole patch. 5-10 year → overlay or mill-and-fill.
Repair Method Comparison
| Method | Best for | Service life | When to use |
|---|---|---|---|
| Cold patch (cold asphalt) | Isolated shallow holes, winter, remote sites | 3-12 months | Emergency / interim |
| Hot-mix pothole patch (saw-cut & backfill) | Isolated deep holes, stable base | 2-5 years | Normal maintenance |
| Full-depth repair + base | Failed subgrade, alligatored areas | 5-10 years | Structural damage |
| Mill + overlay / NovaChip | Widespread roughness, cracking | 8-12 years | Whole-segment renewal |
Patch Quality Rules
- Saw-cut square edges (not round blow-outs) so the patch interlocks.
- Clean debris and apply tack coat on vertical walls before backfill.
- Compact in lifts of max 50 mm; never dump a deep hole in one lift.
- Crown the patch slightly above the existing surface to account for future settlement.
