Glazing Repair - How to Repair a Cracked Window

Glazing can have a significant impact on the energy efficiency of your house. This is especially important in older double-glazed windows.

It is possible to change the glazing points by putting the window in place, but it is easier and faster if you take off the glass and frame. It is a good idea to replace the seals made of rubber.

Broken Glass

Windows that are cracked aren't just unsightly but can also allow valuable heat and sunshine to escape your home. It's possible to fix the glass that is cracked without replacing the entire window.

Wear safety goggles and gloves. You should also put a piece of tape with an "X" shape on the glass that you plan to remove (duct or painter's tape works well). This prevents any shattered pieces from falling when you work, which can save you from serious injury.

If you've noticed a small crack in the glass of your window, cover it with tape to block rain, wind and insects. One strip of tape is enough to cover any cracks that are superficial but if you're worried about the weather becoming worse before you can replace your window, you should use an extra-strong plastic cover such as a tarp or a trash bag, to hold the glass in place until you can obtain a permanent fix.

For cracks that aren't quite as shallow, try using a strong adhesive specifically designed for windows, such as Loctite Super Glue Glass. This high-tech glue is made to bond to glass, and dries crystal clear for a perfect finish. Apply it to the crack and allow it completely dry before applying another layer.

Glass windows may also develop stress cracks. Stress cracks are usually caused by large temperature changes and can spread rapidly across the entire window if they are not repaired. To prevent stress fractures, use a glass cutter to cut a small circle close to the crack. Double Glazing Door Repairs can prevent the crack from spreading and can slow it down for several days.

If you're replacing an old window, measure the frame for the new pane. It should be slightly bigger than the opening in order to allow for expansion and contracting and to make up for any imperfections on the frame or on the glass. After cutting your new glass, apply glaziers' compound around the edges of the frame and glass. Once the compound is dry then paint it over it to match the frame of the window.

Condensation on the Inside of Double Glazed Windows

Condensation inside double-glazed windows is usually an indication that the seal along the window unit has failed. This is a serious issue because it indicates that the heat that is coming from your home is being lost through the window and can be costly for you and your energy bills.

Double glazing is designed to block heat transfer between two panes by sandwiching an air or vacuum layer between them. This creates a airtight seal and keeps warm air from exiting the home. If the glass is cooler than the frame, condensation can form on the glass and cause damage to the window. If you've got condensation on your double-glazed window that you are unable to eliminate it by opening the windows, by using extractor fans, dehumidifiers, or by trickle venting, you might need to call in a professional.

Condensation on the exterior of double-glazed windows is not common However, it could happen when the seal has started to weaken between the glass and the frame. It is more common during winter, when the temperature is lower. This makes it easier to create condensation. This is caused by an issue in the spacer used between the frame and the window. This spacer contains desiccant, which is extremely absorbent and will soak up any moisture that is present.

The issue is that when the desiccant becomes saturated it will begin to break down, and eventually moisture can start to enter the gap between the glass units. This can cause condensation and water to build within the gap, which is difficult to get rid of.

Most reputable window companies offer a warranty and replace the glass and unit of the window if it's damaged due to condensation. It is crucial to report any problems to your window installer when you spot them so that the condensation can be repaired as soon as possible in order to prevent further damage to the window unit as well as the surrounding frame.

Shattering Window Glass

A damaged or cracked window could be more than an aesthetic issue. It could also pose a safety risk, especially when it's spreading. It is best to get it repaired as quickly as you can. Glass adhesives are available for windows in vehicles which you can purchase online or in many auto maintenance shops. You can also make use of a glazing compound for use at home that is available at a variety of hardware and home improvement stores.

Put on thick gloves and safety goggles prior to start any work. Sweep the area to remove any large pieces of shards. You should also vacuum any chips. This will stop them from causing injury to you or a glazing repair worker later on.

It is better to stand on a ladder instead of on the ground. This will allow you to reach all parts of the frame and keep you safe from falling glass. Before you start it's important to clean the rabbet. This is the area that the glass will be placed. Apply a coat of linseed on the rabbet, then wipe it clean. This will help the putty to stick.

After the frame has been cleaned and the rabbet is prepared, it's the time to get ready for the replacement of the broken pane. Take measurements of the width and height of the opening both ways, then order an item of double-strength glass that is 1/8 inch smaller in both directions. You'll need to buy glass points, which is a metal triangle that keeps the glass in the right place.

With the window sash off the way, gently pry it away from the wood molding using a flat pry bar. It is possible scrape off old glazing with a knife or chisel. Then make use of the heating gun to warm any putty that isn't able to be removed. This will make it easier to remove.

After the frame has been removed from the mold, gently press the new glass into its place. Fill in the gaps using a glazier's tip or putty knife. Once the putty is dry paint the frame to match. Paint a little bit over the edge of the compound, then onto the glass to completely seal it.

Replacement Window Glass

If you're replacing a damaged window, be sure to wear eye protection and gloves to protect yourself from glass shatters. Tape the window's edges to prevent it from breaking again when you remove it.

Utilize a utility blade to cut off the old glazing compound from the frame and glazing points (small triangles of metal). Clean the entire opening of the frame, and then apply a coat linseed to help the new putty adhere better.

Once the frame is prepared, measure it to determine the size of a new windowpane. Then purchase it at a home improvement retailer or other retailer. Be sure to purchase the pane one-sixth inch shorter in every direction than the measurement to allow for an ideal fit.


It's much easier than you think to put in windows that are new. However, it is important to follow the instructions provided by the manufacturer to ensure a proper fit and a long-lasting replacement pane. Use a wirebrush to remove any old paint or wood gunk from the frame opening. Then sand the wood until it is the surface of the wood to strengthen the seal.

Make use of the point of the putty knife while putting in the new pane to bed it lightly against the wood frame. Then, press glazier's points into the frame about every six inches to keep the new window firmly in the frame.

After the frame has cured, coat the joint with a few coats of paint to match the rest of the frame. Let the paint completely dry before moving on to cleaning and maintaining your window. Maintaining windows in good condition and ensuring that they function correctly will extend their lifespan and improve the energy efficiency of your home. You may want to replace your windows if they are damaged or are old. If you decide to go with this option, we recommend selecting a high-quality insulated window to cut down on your energy bills. The type of window that you choose will also affect the total cost of your project.