TL;DR:
- Most windshield cracks fall into nine categories, including chips, star breaks, and stress cracks, with some repairable and others requiring replacement. Acting quickly within 24 hours, covering damage, photographing it, and avoiding DIY repairs can preserve options, while size, location, and contamination determine repair feasibility. Vehicles with ADAS features typically need full windshield replacement and recalibration to ensure safety systems function correctly.
Most windshield crack types fall into one of nine categories: star break, bullseye, half-moon (partial bullseye), chip or pit, floater crack, edge crack, short crack, long crack, stress crack, and combination break. The quick verdict: chips and small breaks below certain size thresholds are usually repairable; star breaks and cracks have size limits that may allow repair under the right conditions; stress cracks, edge cracks within 2 inches of the frame, and anything in your direct line of sight almost always require replacement.
Right now, do these three things:
- Stop driving if the crack is longer than 6 inches, crosses your sightline, or is visibly spreading.
- Cover the damaged area with clear adhesive tape to keep out moisture and grit until a technician can assess it.
- Photograph the damage for your insurance claim before touching anything.
Size thresholds from the ROLAGS standard (ANSI AGSC NWRD ROLAGS 002-2022): bullseye and half-moon ≤ 1 inch (25 mm), star break ≤ 3 inches (75 mm), combination break body ≤ 2 inches (50 mm), cracks up to 14 inches (350 mm) may be repairable under test conditions.
Table of Contents
- 2. What each windshield crack type looks like and whether it can be repaired
- 3. How to tell if a windshield crack is serious
- 4. Repair size limits and what ADAS means for your decision
- 5. What to do right after you identify the crack
- 6. What repair and replacement typically cost
- Key Takeaways
- The case for getting a professional assessment sooner than you think
- FAQ
2. What each windshield crack type looks like and whether it can be repaired
Every break has a shape, a cause, and a repairability profile. Here is the full catalog.
| Type | What it looks like | Common causes | Repairability |
|---|---|---|---|
| Bullseye | Circular cone with a clear impact point | Rock or road debris | Repairable ≤ 1 inch (25 mm) |
| Half-moon (partial bullseye) | Semicircular chip, incomplete ring | Glancing rock strike | Repairable ≤ 1 inch (25 mm) |
| Star break | Impact point with radiating legs | High-velocity debris | Repairable ≤ 3 inches (75 mm) |
| Chip / pit | Small surface gouge, no legs | Gravel, sand, hail | Repairable if shallow |
| Floater crack | Crack starting away from any edge | Temperature stress, road vibration | Conditional (length and depth; up to 14 inches per ROLAGS) |
| Edge crack | Crack reaching or starting at the glass edge | Impact near frame, thermal stress | Replacement likely |
| Short crack | Crack ≤ 6 inches, no impact point visible | Minor impact, vibration | Conditional (up to 14 inches per ROLAGS) |
| Long crack | Crack > 6 inches | Significant impact, spreading chip | Conditional up to 14 inches (350 mm) per ROLAGS |
| Stress crack | Crack from edge with no impact mark | Thermal cycling, poor installation | Replacement required |
| Combination break | Impact point plus radiating cracks | High-energy debris | Repairable ≤ 2 inches (50 mm) body diameter |
What to look for when you inspect the damage
Bullseye and half-moon breaks are the easiest to identify: look for a circular or semicircular cone shape with a distinct impact point at the center. From three feet away they look like a coin pressed into the glass. Up close, you can see whether the cone is complete (bullseye) or partial (half-moon).
Star breaks radiate multiple legs outward from a central impact point, like a cracked windshield in a cartoon. The key measurement is the total diameter of the pattern, not just the longest leg. Legs that cross into your sightline change the calculus even if the overall diameter is under 3 inches.
Chips and pits are surface gouges with no radiating cracks. They are the most forgiving break type, but a chip that has been sitting in the sun for a week with dirt packed in is far harder to repair than a fresh one.
Floater cracks start in the middle of the glass, away from any edge. They often appear after a temperature swing rather than a direct hit, which makes them easy to confuse with stress cracks. The difference: a floater usually has a tiny impact mark at its origin; a stress crack does not.
Edge cracks reach the perimeter of the glass. Because the edge is where the windshield bonds to the frame, any crack there compromises structural integrity quickly. Stress cracks are a specific type of edge-originating fracture with no impact point at all, caused by thermal expansion, a bad installation, or frame flex. They are generally unrepairable because the underlying tension keeps driving propagation.
Combination breaks have a central impact zone plus radiating cracks and sometimes a partial bullseye ring. Technicians measure the body diameter of the central damage separately from the legs.
Technician signals that go beyond shape:
- Origin point: Edge damage weakens the bond line and spreads faster than center damage.
- Contamination: Dirt, washer fluid, or road grime packed into the crack reduces resin adhesion significantly.
- Layer penetration: If the crack has punched through the inner glass layer (you can feel a ridge on the inside surface), repair is off the table.
- Driver’s Primary Viewing Area (DPVA): Even a structurally sound repair leaves a visible haze or scar because resin refracts light differently than glass. Damage in the DPVA is typically considered non-repairable for safety reasons.
Pro Tip: Run a fingernail across the inside surface of the glass directly behind the damage. If you feel a ridge or sharp edge, the inner layer is compromised and replacement is the only safe option.
3. How to tell if a windshield crack is serious
Five factors determine whether a crack is a quick repair or a safety emergency.
1. Size and length. A small chip or a short crack is usually manageable. Once a crack passes 6 inches, most national chains decline the repair, though ROLAGS technically permits repairs up to 14 inches under controlled conditions. Anything longer than 14 inches is replacement territory, full stop.
2. Location relative to your sightline. The DLOS (Driver’s Direct Line of Sight) is the area directly in front of the driver, roughly the size of a dinner plate centered on the steering wheel. Damage here is treated as non-repairable even when it is small, because the resin repair will leave optical distortion exactly where you need clarity most.
3. Distance from the edge. Any crack close to the windshield’s perimeter is a replacement call. Edge proximity accelerates spreading and compromises the structural role the windshield plays in a rollover.
4. Number of cracks or legs. Per ROLAGS, multiple long cracks originating from a single impact point push the damage into replacement territory regardless of individual leg length.
5. Contamination and age. A crack that has been open to the elements for more than a day or two has likely collected debris that blocks resin penetration. Contamination and damage age are among the top reasons repairs fail.
Quick decision flow:
- Repair now: Chip or star break under size limits, away from edges and sightline, clean and recent.
- Replace now: Edge crack, stress crack, DPVA damage, inner-layer penetration, three or more long cracks.
- Book an urgent assessment: Any crack that is spreading, any damage you cannot clearly identify, or any break on an ADAS-equipped vehicle.
Simple owner inspection steps:
- Use a bright flashlight held at a low angle to the glass to reveal crack depth and contamination.
- Hold a magnifying glass over the impact point to check for a central cone (impact origin) versus a clean edge start (stress or manufacturing defect).
- Check the inside surface for ridges or sharp edges that signal inner-layer penetration.
- Cover the area with clear tape immediately if you cannot get an assessment within a few hours.
For a deeper look at why cracks spread faster than expected, the propagation mechanics matter more than most drivers realize.
4. Repair size limits and what ADAS means for your decision
ROLAGS limits vs. real-world shop policies
The ROLAGS standard sets the technical ceiling for repairs. Many national chains apply a stricter internal policy, often 6 inches, for speed and liability reasons. That gap matters when you have a 9-inch floater crack that a specialty technician could safely repair but a chain shop will automatically decline.
| Damage type | ROLAGS repair limit | Common shop policy |
|---|---|---|
| Bullseye | ≤ 1 inch (25 mm) | ≤ 1 inch |
| Half-moon | ≤ 1 inch (25 mm) | ≤ 1 inch |
| Star break | ≤ 3 inches (75 mm) | ≤ 3 inches |
| Combination break | ≤ 2 inches (50 mm) body | ≤ 2 inches |
| Crack (floater/short) | Up to 14 inches (350 mm) | Often capped at 6 inches |
| Stress crack | Not repairable | Not repairable |
| Edge crack | Replacement recommended | Replacement |
The 6-inch rule is a business policy, not a technical standard. Specialty technicians using appropriate tooling and resin chemistry can safely address longer cracks within ROLAGS’ 14-inch limit. The key variables are contamination, crack age, and whether the damage touches any safety-critical zone.
Absolute replacement conditions (per ROLAGS)
- Damage penetrating the inner glass layer
- Three or more long cracks from one impact
- Contamination that cannot be cleaned before resin injection
- Stress cracks (no impact origin, edge-initiated)
- Any damage affecting ADAS camera or sensor zones
- Damage in the DPVA where optical clarity is non-negotiable
ADAS: when repair is not enough
Vehicles with forward-facing cameras, rain sensors, or heads-up display projectors mount those components directly behind the windshield, often in a band across the top third of the glass. Any damage or repair in that zone typically requires full windshield replacement and recalibration. Recalibration re-establishes the precise angle and distance parameters the camera uses for lane-keeping, automatic emergency braking, and adaptive cruise control. Skipping it after replacement means those systems are operating on incorrect baseline data.
If you are unsure whether your vehicle has ADAS, check whether your car needs ADAS calibration before scheduling any glass work.
Pro Tip: The single biggest factor in repair success is how quickly you act. A clean, fresh chip repaired within 24 hours bonds far better than the same chip assessed three days later with grit and moisture packed in. Cover it with clear tape and call the same day.
5. What to do right after you identify the crack
Speed and cleanliness protect your options. Here is the order of operations:
- Stop or limit driving if the crack is longer than 6 inches, crosses your sightline, or is actively spreading. Vibration and temperature changes accelerate propagation.
- Cover the damage with clear adhesive tape. It keeps moisture and road grit out without trapping anything already inside.
- Photograph everything before touching the glass. Wide shot, close-up, and one with a coin or ruler for scale. Your insurer will want this.
- Schedule an assessment within 24–48 hours. The longer you wait, the more contamination works into the crack.
- Skip the DIY resin kit for anything larger than a tiny, fresh surface pit. Over-the-counter kits lack the vacuum injection equipment needed to fully displace air from the crack, and a botched DIY attempt can make professional repair impossible.
For a full comparison of DIY vs. professional repair options, the tradeoffs are more significant than most drivers expect.
When booking a technician, tell them:
- The type of break (use the names from the table above)
- Approximate size and location on the glass
- How long ago it happened and whether it has been exposed to rain or washing
- Whether your vehicle has ADAS features (forward camera, lane-keep assist, automatic braking)
Request in writing: a workmanship warranty, confirmation that the technician is certified, and ADAS recalibration if replacement is required.
Pro Tip: Mobile technicians can assess and repair at your home or office, which eliminates the drive that risks spreading the crack further. For San Diego County drivers, Speedy Windshield Repair San Diego dispatches fully equipped certified technicians to your location.
6. What repair and replacement typically cost
Costs vary by vehicle, glass type, and whether ADAS recalibration is needed. These are typical U.S. ranges based on industry data:
- Chip or small bullseye repair: $65–$150. Most insurers cover this with little or no deductible because it is cheaper than replacement.
- Short-crack repair (under 6 inches): $125–$300, depending on crack complexity and location.
- Full windshield replacement: $400–$1,000 or more for standard vehicles; ADAS-equipped vehicles run higher because of the cost of OEM or OEM-equivalent glass and recalibration.
- ADAS recalibration: Often bundled with replacement but may be billed separately; the requirement is non-negotiable on equipped vehicles.
Timeline expectations:
- Chip or small-crack repair: 30–60 minutes, drive away immediately.
- Full replacement: 1–3 hours for the glass work, plus a cure window (typically 1 hour minimum before driving) and a separate ADAS recalibration appointment if required.
Insurance basics:
- Comprehensive coverage typically covers windshield damage. Many policies repair chips with a $0 deductible because it prevents a more expensive replacement claim later.
- California drivers should verify their insurance coverage for windshield replacement before scheduling, since policy terms vary.
- Insurers increasingly prefer replacement over repair for ADAS-equipped vehicles because a failed repair in the camera zone creates liability.
- Filing a glass claim generally does not raise your premium in California, but confirm with your carrier before proceeding.
Key Takeaways
Most windshield damage falls into a repairable category if you act within 24 hours, keep the area clean, and the break is outside your direct sightline and away from the glass edge.
| Point | Details |
|---|---|
| Size limits from ROLAGS | Bullseye/half-moon ≤ 1 inch (25 mm), star ≤ 3 inches (75 mm), combination ≤ 2 inches (50 mm), crack up to 14 inches (350 mm) under right conditions. |
| DPVA damage means replacement | Any break in the driver’s primary viewing area leaves optical distortion even after repair; replacement is the safe call. |
| ADAS zone requires recalibration | Damage or repair in the camera/sensor band requires full replacement and mandatory recalibration. |
| Act within 24–48 hours | Contamination and age are the top causes of repair failure; clear tape buys time until a technician arrives. |
| Edge cracks and stress cracks | Both require replacement; stress cracks have no impact origin and keep propagating under thermal tension. |
The case for getting a professional assessment sooner than you think
Most drivers underestimate how fast a repairable chip becomes an unrepairable crack. The window between “this can be fixed in 30 minutes” and “you need a full replacement” is often measured in hours, not days. A temperature swing, a car wash, or a highway drive can push a clean 1-inch star break into a 4-inch spider web before the end of the workday.
The other thing most guides skip: the 6-inch rule that national chains apply is not a safety standard. It is a throughput policy. A certified technician with the right vacuum-injection equipment and resin chemistry can safely address cracks up to 14 inches per ROLAGS, which means drivers who get turned away at a chain shop often have a repairable windshield. The difference is specialization and tooling, not the physics of the glass.
ADAS adds a layer of complexity that most drivers do not think about until after they have already scheduled a repair. If your vehicle has a forward-facing camera, a repair anywhere near that mounting bracket may look fine structurally but still require a full replacement to preserve calibration integrity. Getting that assessment from someone who handles ADAS calibration after windshield replacement routinely is not optional. It is the difference between a safety system that works and one that is operating on bad data.
Speedy Windshield Repair San Diego’s certified mobile technicians carry the tooling to handle everything from a fresh chip to a long floater crack, with a lifetime workmanship warranty and full ADAS recalibration capability. The 4.9-star rating from hundreds of San Diego County customers reflects one consistent pattern: people who called within 24 hours of the damage almost always paid less and drove away the same day.
Useful sources
| Source | Why it matters |
|---|---|
| ROLAGS (ANSI AGSC NWRD ROLAGS 002-2022) | The primary U.S. industry standard for windshield repair; defines all size thresholds and replacement conditions used by certified technicians. |
| Glass.net: repair vs. replacement guidance | Practical decision framework covering DPVA rules, cost ranges, and optical limitations of resin repairs. |
| Ultra Bond: long-crack repair | Explains the gap between the 6-inch shop policy and the 14-inch ROLAGS technical limit; useful for understanding specialty repair capabilities. |
| Glass Inc: contamination and crack causes | Technician-level explanation of why contamination and damage age are the primary drivers of repair failure. |
| SLP Auto Glass: stress crack definition | Clear technical description of stress cracks, their origin, and why they are generally unrepairable. |
FAQ
What kinds of windshield cracks cannot be repaired?
Stress cracks, edge cracks within 2 inches of the frame, any damage penetrating the inner glass layer, three or more long cracks from one impact, contaminated breaks that cannot be cleaned, and any damage in the Driver’s Primary Viewing Area are all replacement cases per ROLAGS.
What types of windshield damage can be repaired?
Bullseye and half-moon chips up to 1 inch (25 mm), star breaks up to 3 inches (75 mm), combination breaks with a body diameter up to 2 inches (50 mm), and floater or short cracks up to 14 inches (350 mm) under the right conditions are all potentially repairable, provided the damage is clean, recent, and outside the driver’s sightline.
How do you tell if a windshield crack is serious?
A crack is serious if it is longer than 6 inches, within 2 inches of the edge, in your direct line of sight, actively spreading, or on a vehicle with ADAS features where the camera zone is affected. Any of those conditions warrants same-day professional assessment.
What does a stress crack look like in a windshield?
A stress crack starts at the edge of the glass and travels inward with no visible impact point at its origin. It tends to run in a relatively straight or gently curved line, unlike the radiating legs of a star break. Because there is no impact cone, you cannot feel a chip or pit at the starting point.
Can a long windshield crack be repaired?
Yes, in some cases. ROLAGS sets the technical repair limit at 14 inches for cracks under the right conditions. Many chain shops cap repairs at 6 inches as a business policy, but a certified specialist with vacuum-injection equipment can safely address longer cracks when the damage is clean, not in the DPVA, and does not involve the ADAS zone.
Recommended
- Why Should You Replace Your Windshield in Case of a Crack? – Speedy Windshield Repair – San Diego, CA
- Windshield Repair vs. Replacement – How to Decide – Speedy Windshield Repair – San Diego, CA
- Common Causes of Windshield Cracks and Chips: Keeping Your View Clear and Safe – Speedy Windshield Repair – San Diego, CA
- How We Fix Any Windshield Issue: Chips to Cracks – Speedy Windshield Repair – San Diego, CA
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