When a windshield is damaged beyond a safe repair, replacement is the only sound option. This page explains how the decision is made and what a proper replacement involves, so you can judge a quote and ask the right questions. It describes the work in general terms and does not offer it.
Signs a windshield needs replacing
There is no single rule, but replacement is usually advised when:
- A crack is longer than a few inches or is still spreading
- The damage sits in the driver's line of sight
- A chip or crack runs to the edge of the glass
- The glass is shattered, pitted or damaged at several points
- The damage goes through both layers of the laminated glass
If you are not sure, a photo with a coin next to the damage helps any provider or insurer give a first opinion. For small damage, read about repair options first.
What a proper installation looks like
- The old glass is cut out and the frame (the pinch weld) is cleaned and checked for rust.
- Primer and fresh urethane adhesive are applied in a continuous bead.
- The new windshield is set in place and pressed to seal.
- The adhesive cures for the time the manufacturer specifies before the vehicle is driven, often called the safe drive-away time.
- Trim, sensors and wipers are refitted, and any camera is recalibrated if required.
A rushed installation can leave leaks, wind noise or air gaps, and a poor bond reduces the windshield's contribution to roof strength and airbag performance.
Driver-assist cameras
Many recent vehicles carry a forward-facing camera mounted on the windshield for lane keeping and automatic braking. After replacement, the camera often has to be recalibrated so those systems read the road correctly. The article on ADAS calibration after windshield replacement explains static and dynamic calibration and what to ask about it.
OEM or aftermarket glass
Original equipment glass is made to the vehicle manufacturer's specification, while aftermarket glass comes from other producers and varies in quality and in fit. Price, availability, insurance terms and driver-assist features all influence the choice. See OEM vs. aftermarket windshields.
Questions worth asking any provider
- Is the quote itemized, and does it include calibration and moldings?
- Which brand of glass and which adhesive will be used?
- What is the safe drive-away time for today's conditions?
- Is there a written warranty on workmanship and leaks?
Pricing details are in the guide to replacement costs in Portland, and the claims process is covered in insurance claims for windshields.