If you're in the market for auto glass installation the average cost to have the service performed by a professional is about $300 depending for a windshield on a passenger vehicle. The only way to lower the cost is to do the job yourself. If that's something you would prefer, you'll need auto glass installation supplies and someone that can help you change out the large sheet of glass. After you purchase everything you need for the job, you'll need to know what steps to take to remove the old glass and install the replacement glass.

How to Install a Windshield Yourself

The first step to installing auto glass is to buy the replacement tools. You can buy the glass from a junk yard to save on cost but be sure to check for any cracks or chips that may be present. Then, using your auto glass installation tools, you'll want to remove the old glass. Use lots of cushioning. This can be a duvet or other type of blanket. If the windshield was purchased from a junk yard you won't be able to install it right away. You'll need to remove the urethane bead or trim it to 1mm with a razor blade.

The next step in removing your old windshield is to correctly take off the plastic side and top moldings without breaking the the little plastic pieces used in mounting the glass. If you pry too hard they will break.

Next you'll want to slice through the urethane with a cold knife along the outside between the glass and the pinchweld. The urethane is basically what holds the glass windshield in place. It's flexible but it's also very strong. This that allows the glass to move slightly while driving.

The pinchweld needs to be trimmed down to 3mm. Clean away dirt with a brush and plain water. Fix any rust issues and prime any areas of bare metal.

You will then want to use a specialized primer that's matched to the urethane adhesive. It's important not to skip this step our your windshield could pop out later. Be sure to apply the urethane with an electric caulking gun to get a consistent bead. Make sure it sticks to the old urethane but it must be free from dirt, oil, and other debris.

Carefully align the windshield in its place. Be sure not to touch the frit band as the oils from your hands can affect the activated glass and reduce the effectiveness of the activator. You won't want to take your time though as the urethane will dry out if the installation of the new glass takes too long. Use a knife to wipe off excess urethane.

The last step is to replace your weather sealant or decorative molding. You'll then want to let your vehicle sit for at least several hours to allow the urethane to dry completely. Not waiting can result in the windshield popping out of place, creating a hazard for yourself and other drivers.