As a responsible homeowner, you should know what to do when your window cracks. The unfortunate truth is that if your window has a crack, it will eventually grow, regardless of its size, and you will need to replace it. But before you get to that stage, there is a great deal you can do to lessen the impact of a cracked window and control its spread.

Masking Tape

A little crude but surprisingly effective, you can apply masking tape to both sides of the crack to stop it from spreading. This will stop water from leaking through, keep the glass intact, and prevent further cracking. You can achieve the best results by pressing the tape firmly onto the crack.

Glass Adhesive

Glass adhesives are generally used for car windshields, but they can be applied to the windows on your home as well. Before you use them, however, it is advisable that you thoroughly clean the spot near the crack, removing any potential debris with an eyedropper. This will stop the adhesive from leaking out the window. With a syringe or brush, apply the adhesive to the crack. Let it dry entirely before you remove the tape.

Thick Plastic Cover

An excellent solution for removing drafts, applying a thick plastic covering on the top of the window crack allows you to protect your cracked window. These covers can be made of shower curtains, tarps, shopping bags, or any item made from plastic sheeting. You can use duct tape to hold it to the glass.


If there was a gold standard for what to do when your window cracks, using epoxy as a sealant would be it. By stirring hardener and resin with a toothpick on a disposable plate, you can create a two-part epoxy. Using a putty knife, gently place the mixture on the broken glass and leave it to dry. Then get rid of any excess epoxy with a sharp blade and polish the window with glass cleaner.


Although there is no way to entirely protect your windows against the world, you can limit your chances of experiencing a crack by having them replaced regularly. Some people replace their windows every summer to ensure their windows will be able to handle the upcoming rainy season and difficult weather. If you are concerned that your windows are worn and likely to break, this could be a great way to get ahead of the problem.