How to fix broken glass windows

A glass window on the top of a garage door might be broken, but the glass on the bottom of a window might be too. 

If you’re going to repair or replace your glass window, it might be worth looking at whether the windows are still cracked or not. 

That’s because broken glass can be more easily repaired than cracks or imperfections. 

According to the National Highway Traffic Safety Administration (NHTSA), a glass window that cracks will have the same crack strength as one that is completely smooth and free of any imperfections that would otherwise be caused by the original damage. 

This means that the crack will be visible to the driver of the car that’s being repaired, regardless of how the window was cracked. 

However, if a cracked window is still visible, the driver should not use the car to take a short cut to a garage or an area where there might be more debris. 

The crack strength of the glass depends on the amount of light in the window and the angle the window is viewed from. 

For example, a window with a high angle of view and a low crack strength will be much more likely to crack, even though the crack is less visible. 

Even if the crack strength is less than that of a perfect perfect window, there is still a chance that the glass could break during a collision. 

Cracks that appear on the outside of a glass frame that’s installed in a garage will usually be small and easily missed, and can be repaired without damaging the glass. 

But if a crack appears in a window installed on a roof overhang, or in the frame of a door, then it’s a good idea to check to make sure it’s not a structural problem. 

It’s important to note that this does not mean that all cracks in glass are caused by imperfections on the surface of the window. 

Some glass windows are more susceptible to cracking than others. 

So if the window crack is visible to you, it’s probably not a problem.

However, if you have a cracked or imperfect glass window in your garage or in an area that may contain debris, you should check it out and see if it needs to be repaired.

If the crack does not require repair, you can inspect the window with the light meter and see what light is being reflected from the window surface. 

There is no guarantee that the light from the mirror will reflect accurately onto the glass, so you should take that into consideration.

If the mirror is damaged, the repair should take a few minutes to a few hours, depending on the repair method. 

To repair cracked glass, follow these steps: 1.

Install the new window on a windowless roof overlay. 

Using a window that has been installed on the roof overhaul or on a glass overhang in a location where there is no debris will ensure that the window won’t crack during the installation. 

Install the new glass window using a metal bracket that’s mounted in the underside of the overhang. 

Place the bracket on the underside, then use a sharp, thin, round, or oval-shaped knife to cut the bracket’s plastic side to the desired depth. 

Check the depth of the bracket to make certain that the new edge doesn’t touch the bottom edge of the frame. 

You’ll need to be careful not to damage the window frame as you work. 


Using a magnifying glass, inspect the new angle of the pane. 

A mirror, for example, will have a high mirror angle and a high crack strength. 

On the outside, the crack should be visible.


Apply a coat of epoxy to the crack. 

Apply a coat or two of epoxies to the edge of a cracked glass window.

A clear coat of an epoxy is a good option for this because it will not seal the crack and allow the glass to shatter. 

In most cases, epoxy will hold the crack open for a while. 

After applying the epoxy, inspect to make the epoxys look as clear as possible and then spray the window once the epoxide is dry. 


Apply the ephelion. 

Put a thin layer of ephelions on a crack in a glass.


Apply another coat of a clear epoxy. 

Repeat this process to repair a cracked, missing, or damaged glass window installed over a window overhang that has an overhang and a roof.


Inspect the crack to make a good impression on the inside of the crack with the lens of the lightmeter.


Replace the broken glass window with an intact one.


Inspect to make adjustments to the repair.

 If the repair is successful, you will need to remove the old glass window and replace it with an improved one. 

(Note: If you have any questions about the repair or any problems with the repair, contact us and