Chip vs Crack — Why the Distinction Matters
Walk up to a damaged windshield and it might not be immediately obvious whether you have a chip or a crack. But the distinction matters enormously — because the repair approach, cost, and even repairability depend entirely on which one you have.
What Is a Windshield Chip?
A chip is a point-of-impact damage — a small area where a rock or road debris struck the glass and removed a fragment. Chips typically measure less than 1 inch in diameter. Common chip types include:
- Bullseye: Circular impact mark, looks like a target. Most repairable type.
- Star break: Multiple cracks radiating from a central impact point, like a starburst.
- Half-moon: A partial bullseye shape, usually caused by a curved impact.
- Pit: Tiny missing chunk, often barely visible. Usually repairable if shallow.
- Combination break: A mix of bullseye and star break — still often repairable if under 2 inches.
What Is a Windshield Crack?
A crack is a line — it extends across the glass rather than staying concentrated at one point. Cracks can start from a chip that was ignored, or form directly from stress (temperature change, door slam, frame flex). Types include:
- Stress crack: Appears without any impact, usually from temperature extremes or a frame under tension. Starts at the edge.
- Edge crack: Begins within 2 inches of the windshield border — very difficult to repair, usually requires replacement.
- Floater crack: Starts in the middle of the glass, not at the edge. Sometimes repairable if under 3 inches.
- Long crack: Any crack over 3 inches. Almost always requires full replacement.
Repair vs Replace — Quick Decision Guide
| Damage | Size | Verdict |
|---|---|---|
| Bullseye chip | Under 1" | ✅ Repair |
| Star break | Under 3" | ✅ Usually repair |
| Floater crack | Under 3" | ⚠️ Maybe repair |
| Edge crack | Any size | ❌ Replace |
| Long crack | Over 3" | ❌ Replace |
| Chip in driver's line of sight | Any | ❌ Replace |
Why Do Chips Turn Into Cracks?
A chip that isn't repaired will almost always spread into a crack — it's just a matter of time. The triggers include:
- Temperature changes: Glass expands in heat and contracts in cold. The stress focuses at the chip point and pushes the crack outward.
- Vibration: Driving on rough roads, slamming doors, or hitting potholes flex the windshield frame — the weakened point at the chip gives way first.
- Moisture: Water seeps into the chip and freezes overnight, expanding and widening the damage.
- Direct sunlight: Parking in the sun heats the glass unevenly, accelerating crack propagation.
Bottom line: A chip repaired today for $0–$125 (often free through insurance) prevents a $250–$900 full replacement tomorrow. Don't wait.
What to Do Right Now
- Cover the chip with clear tape to keep moisture and dirt out until you can get it repaired.
- Park in shade when possible to reduce thermal stress.
- Call Auto Renu at 1-800-684-3629 — we'll tell you in 60 seconds whether your damage is repairable or needs replacement, and check your insurance coverage for free.
Mobile service throughout the East Bay — we come to you, same day in most areas. Get a free quote online →
Need Auto Glass Service in the East Bay?
We come to you — home, office, or anywhere you park. Same day service, often free through insurance.