Windshield crack repair in Charlotte, NC: which cracks can be saved

If what you have is still a small pit or star with no line running from it, the page on windshield repair in Charlotte NC is the one for you. Charlotte Auto Glass is the Charlotte website of Impex Auto Glass; Impex does the work at its shop at 5641 David Cox Rd in north Charlotte or wherever your car is parked.

Three kinds of crack

ROLAGS, the Repair of Laminated Automotive Glass Standard administered by the National Windshield Repair Division, gives cracks names by length and position. They are worth knowing, because the name often tells you the answer.

Kind of crack	ROLAGS definition	What usually happens
Short crack	6 inches (150 mm) or less	Often repairable, if it is clean and away from the edge
Long crack	More than 6 inches	Sometimes repairable within the standard; often replaced
Edge crack	Extends to an edge of the glass	Usually replaced

The standard’s published outer limit is that single line cracks up to 14 inches are repairable. In practice many shops replace a windshield once a crack is past about six inches, as a rule of thumb, because a long repaired crack is more visible and more likely to keep moving. Neither figure is a North Carolina law.

How to measure a crack before you call

1. Find both ends. Look from inside the car with light behind the glass. The thin end of a crack is easy to miss.
2. Measure end to end. A tape measure or a dollar bill works. A dollar bill is a little over six inches long, which is close to the ROLAGS short crack line.
3. Check the edges. Does the crack touch the black band at the edge of the glass, or start from it? That is an edge crack.
4. Note where it runs. Is it across the area the wiper on the driver’s side clears, or low and to the passenger side?
5. Take a photo. Send it with the quote form. A coin or a ruler in the picture shows the size.

When a crack can be repaired

A crack repair works on the same idea as a chip repair. The technician stops the crack from running further, then works resin into the full length of the line and cures it so the glass is bonded together along the crack. The windshield stays in the car, so there is no urethane to cure and no camera to calibrate.

The cracks that repair well tend to have a few things in common:

• Short, a single line, and not branching.
• Away from the edges of the glass.
• Out of the driver’s main view.
• Fresh, and kept clean and dry since it happened.
• Only in the outer layer of glass.

Most cracks start from a stone strike, so the impact point at one end is usually filled as part of the same repair. If the crack has grown out of a chip you have been watching for a while, bring it in sooner rather than later: every hot afternoon and cold morning works the end of the crack a little further.

When a crack means a new windshield

Impex’s own guide is that once damage is large, deep or runs to the edge, a full replacement is the safer job. For cracks, that usually means:

• Edge cracks. A crack that reaches the edge runs into the part of the windshield bonded to the car. Resin cannot restore that edge.
• Long cracks. Past the short crack line, and especially past the 14 inch limit of the standard, replacement is the normal answer.
• Cracks in the driver’s line of sight. A repaired crack still shows as a line. Across the driver’s view that line is a distraction, so it is usually replaced.
• Several cracks, or a crack with branches. More lines mean more places for the glass to keep breaking.
• Cracks through to the inner layer. Damage from inside, or from a hard impact, cannot be filled from the outside.

Why it matters: the Auto Glass Safety Council says the windshield and side glass are part of the vehicle’s passenger restraint system and must be installed properly for airbags to deploy safely, and that the windshield aids in occupant retention. A long crack weakens glass that the car relies on in a crash.

What a replacement involves at Impex

If the crack is past saving, the job becomes a windshield replacement. At Impex Auto Glass it goes like this:

1. The right glass, by VIN. Impex uses VIN-based verification to make sure the correct part is ordered: the same shape, the right bracket for the camera and sensors your car has.
2. Out with the old. The cracked windshield is cut out and the frame cleaned and prepared.
3. In with the new. The new glass is set in urethane adhesive and the trim, mirror and sensors are put back.
4. Calibration when required. On a car with a forward camera, Impex performs ADAS calibration on site immediately after the replacement. Impex says calibration takes between 30 minutes and 2 hours.
5. Curing time. Impex puts the replacement at about one hour plus a short curing period, and says drivers are back on the road within two hours.

The Auto Glass Safety Council describes a minimum drive-away time, the time a vehicle should stay put after installation so the adhesive can bond, and says it varies with the adhesive used and the weather on the day. The technician tells you when your car is ready. For the first day, Impex’s aftercare is to avoid washing the car and slamming the doors.

Cracks and the North Carolina safety inspection

Drivers often ask whether a cracked windshield will cause trouble at their annual inspection. North Carolina’s safety inspection under G.S. 20-183.3 checks the windshield wipers, not the glass itself, and no North Carolina statute or inspection rule sets a crack size. The wipers must be in good working order under G.S. 20-127(a), and blades that are damaged or not adequate to clean the windshield are not approved. G.S. 20-135 requires safety glass in windshields.

So a crack is not an inspection item. It is still a safety problem when it runs across your line of sight or weakens the glass, which is the real reason to deal with it.

Where cracks come from on Charlotte roads

Most start as a stone strike. Interstates such as I-85 and I-485 carry a steady stream of trucks, and North Carolina law, G.S. 20-116(g), requires trucks over 7,500 pounds carrying rock, gravel or stone to keep the load six inches below the walls and securely covered, because loose stone is a road hazard. Construction zones and gravel shoulders do the rest. A chip from any of them, left alone through a few temperature swings, is how most of the cracks we see begin.

Insurance for a cracked windshield

A cracked windshield is normally a comprehensive claim in North Carolina, paid less your deductible unless your policy includes full glass coverage. It is not an at-fault accident, so it does not add Safe Driver Incentive Plan points, though insurers may consider how often you claim. You choose the shop under G.S. 58-3-180. The glass insurance claims guide has the steps, and Impex works with all major insurance providers.

To have the crack looked at, call ahead and bring the car to the auto glass shop in Charlotte on David Cox Rd, or ask for mobile service at home or work.

Questions people ask