A tiny stone chip on your windshield can feel like something you can put off. And most of the time you can — a modern resin-injection repair takes 30 minutes and restores the glass to nearly full strength. But sometimes what looks small is already past the point of repair, and driving on it puts you and your passengers at real risk in a collision.
Below are the five clearest signs that your windshield needs to be replaced, not repaired. If any of them apply to your vehicle, book service the same week — the longer you wait, the more expensive and disruptive the fix becomes.
1. The crack is longer than 6 inches (or the width of a dollar bill)
Repair resin works best on chips smaller than a quarter and cracks shorter than about six inches. Beyond that length, the resin can’t fully stabilize the damage — you’ll see the crack continue to creep across the glass with every temperature change or bump in the road.
A quick field test: hold a Canadian $5 bill against the crack. If the crack is longer than the bill, replacement is the safer call.
2. The damage is directly in the driver’s line of sight
Repair resin, no matter how skillfully applied, leaves a faint distortion — often invisible from the passenger seat but very noticeable when it sits between your eyes and the road. Ontario’s Highway Traffic Act treats obscured driver vision as a safety defect, and any distortion sitting in the wiper-swept portion of the driver’s side is grounds for replacement.
3. The crack reaches the edge of the windshield
The perimeter of your windshield is bonded to the vehicle’s frame with a structural urethane. It’s also the strongest part of the glass. Once a crack touches that edge, the entire pane loses tension — think of a small nick on the rim of a wineglass. From that moment forward, the crack will spread every time your vehicle flexes over potholes, speed bumps, or cold snaps.
“A crack that touches the edge of the glass is a replacement, period. There’s no resin repair that will hold.”
4. There are multiple chips or a spiderweb pattern
Resin repair works on a single, contained chip. If you have three or more separate impact points — or a "star break" where multiple hairline cracks radiate from a central chip — the structural integrity of the glass is compromised in too many places to reliably patch.
This is common after a highway drive behind a gravel truck or a bad snow-plow season. A full replacement is faster and cheaper than trying to repair each chip individually.
5. The inner glass layer is damaged
Modern windshields are laminated: two sheets of glass with a thin plastic (PVB) interlayer between them. Repair resin can only reach damage on the outer layer. If you can feel the crack from inside the cabin — run a fingernail across it — the inner layer has failed, and the windshield can no longer meet safety standards for airbag deployment or roof crush resistance.
What to do next
If any of the above describes your windshield, here’s the fastest path forward:
- Take a clear photo of the damage next to a coin or dollar bill for scale.
- Get a written quote (we can email you one in the same day — send the photo along with your vehicle year/make/model).
- Ask your insurer whether you have zero-deductible glass coverage. Most Ontario comprehensive policies do.
- Book the replacement before the next hard temperature swing — winter cold snaps are what turn a small crack into a full-window failure overnight.
A+ Auto Glass replaces windshields at our Orleans location and via mobile service across the Ottawa region. If you’d like, we can also handle the insurance paperwork directly on your behalf so you never pay out of pocket for eligible claims.
