Do-It-Yourself Double Glazing Repairs

Double glazing can keep a home toasty but can develop problems over time. Leaking, broken glass or foggy windows are all issues that could lead to energy loss, expensive repairs, and health issues.

FENSA certified installers can help you maintain and repair your double-glazed windows to meet the energy efficiency requirements for legal compliance and the resale value.

Broken Panes

A broken window can create a lot of problems, as it can hinder airflow, light and even insects. While you could certainly engage a professional to repair the broken pane however, you could also do the repair yourself at only a fraction of the cost.

To accomplish this, you will need to remove the old pane. Start by putting on safety glasses, gloves for work and dust masks to protect yourself from glass shards and lead dust. Establish a stable work surface that is ventilated in an area. It is also recommended to place an area of drop cloth beneath the work area to catch any loose glass that is being removed. It is recommended to keep a HEPA vacuum in the vicinity to clean dust, debris and hazardous waste when you work.

Utilize a utility blade to scrape the old glazing putty off once the old window is removed. Be careful not to damage the wood frame of the window. If the old putty is having difficulty getting off then you can try using a heat gun first to soften it. Be sure to wear safety goggles when using a heat gun, and use caution to avoid getting any hot wood or glass fragments in your eyes.

Next, prepare the frame to accept the new pane. To account for wood expansion and contraction, measure the opening and subtract one sixteenth inch in both directions. The hardware store in your area can then cut the double strength glass to exactly fit the opening. Dry-fit the new glass to ensure it is snugly fitted before installing.

After you have installed the new glass, apply a small amount of latex caulk around the outside of the opening to create a weather seal. The glazing points are then placed to secure the new pane. Typically, you will need two points on each edge for windows of standard sizes.

After the new glazing compound dries, you can paint it to match the rest. If you're concerned about the possibility of cracks, you can use a sturdy strip of masking tape in order to keep the cracks that appear superficial from getting worse.


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You should inspect the frame first. If there are cracks, rust or corrosion or the frame has broken into two separate pieces you'll have to take it to a professional repair. Metal frames cannot be glued together, and attempting to weld or solder them by yourself will cause permanent damage.

If the frame isn't too damaged, you can apply a small amount of brush and some conservation detergent or water to clean the frame thoroughly. This will eliminate any grease, dust or dirt that has accumulated over the years. Cleaning antique frames with ornate carvings or gesso may reveal the original finish beneath the dust.

If the frame is damaged, you'll need a pair of needle-nosed pliers, wood putty and sandpaper, as well as a small clamp. Start by removing the glass, photo and back of the frame. The frame should be removed at the corners, where you can see brads or nails. Open the joints and remove any glue that was used. Apply new glue.

Loose Compound

The glazing compound used to hold the glass panes within their wooden frames is an important part of the energy efficiency of any historic building. It seals wood, binds glass to frame, and sheds water to avoid damage from water over time. Cracks or gaps in this compound can cause air infiltration, which decreases insulation and raises energy bills. Make sure you are keeping track of the repair work of your double-glazed window to ensure that they run smoothly.

The weatherstripping could be worn out or loose if you notice drafts around your window frames. Replacing the seal can reduce the energy costs and improves comfort. If you hear loud noises outside, such as traffic or machinery, this could indicate that the glass tape is worn out.

Remove the old tape from around the edge of the frame and scrub the area thoroughly. Apply a new piece tape to the frame's edge and press it firmly. You can purchase this at any hardware store, and it's a low-cost option to boost the performance of your double-glazed windows.

Standard super glues are excellent for metal, wood and other common materials. However, they're not ideal for glass surfaces. Look for a glass-based adhesive like Loctite Extreme Glue Gel. This type of adhesive is designed to resist UV and moisture light, making it a good alternative for repairing double-glazed windows.

You'll need to apply a degreaser on the exterior of your window frame and sash before you begin repairing it. This will ensure that the new glue adheres properly. Then prepare the area that will be coated by priming it with an oil-based primer. Prime the entire area including the back of the sash where it rests within the frame.

While you can repair many problems with double-glazed windows, if they're severely damaged or don't offer sufficient insulation, replacement may be the best choice. Consult with an experienced glazier or handyperson to make the best decision. Regular maintenance and repairs will keep your windows looking great for a long time.

Foggy Panes

Foggy windows occur when the window seal fails and allows air to get between glass panes and gradually build up moisture. Foggy windows can lead to many problems, from condensation and calcium deposits to black staining and fungus. It's not just ugly but also causes an increase in energy efficiency as well as increased heating or cooling costs. Fortunately, the issue can be resolved. Foggy windows are typically caused by a simple moisture buildup, so the first step is to get rid of as much of the moisture as you can. This can be accomplished by applying a defogging spray or using shaving cream. If none of these methods work, it's time to get an expert.

Double pane windows can work because of the space between them. The space is typically filled with argon or krypton which are safe gasses that are more dense than air and can reduce heat transfer even more. If the gas has escaped this means that your windows are not insulated as they ought to be. Replace your windows with IGUs to fix the fogging and restore the efficiency of your home.

Some homeowners believe that they must replace the entire window if the fogging happens, but it's not always the case. In fact some glass shops provide replacement of just the insulation glass unit (IGU) without replacing the entire frame or sash. This is a less expensive option and can be just as efficient in fixing your windows.

While there are a few DIY solutions to avoid window condensation, such as defogging cream or shaving gel, it's best to call an expert to ensure the task is done safely and correctly. A window repair specialist will make holes in the glass and then inject an cleaning solution into the space between the panes. They will then clean the soiled surface and dry the inside of the window, restoring its appearance and function. Contact a local window replacement and repair expert to find out more about the process and schedule a no-pressure in-home consultation today.