Can Broken Glass in a Double Pane Window Be Repaired?

Close-up of a shattered double-pane window with visible cracks and damage in San Jose

Can Broken Glass in a Double Pane Window Be Repaired?

Double-pane windows have become incredibly popular for San Jose homes because they offer an added layer of insulation that can dramatically reduce utility costs. These windows are designed with two layers of glass separated by a sealed compartment that’s filled with argon to create an insulating layer that reduces heat transfer, reduces external noise, and improves the overall comfort of the home.

Just like any other type of window, double-pane windows can sustain damage from severe weather, thrown objects, and other environmental hazards. However, damage may only be present on one of the two sheets of glass, so you might wonder if it’s possible to simply repair the single pane of glass to restore the window. Double-pane window repair is more complicated than single-pane window repair, and it requires the help of seasoned professionals like the team at J&M Windows and Glass.

Types of Damage Possible in Double Pane Windows

Double-pane windows may become cracked or chipped. You may not immediately spot these types of damage if the cracks are small, but you will likely notice fogging between the two windowpanes, which indicates that the seal between the glass panels has been compromised. Common causes of window damage include flying objects from storms or accidents, break-in or vandalism attempts, extreme temperature fluctuations, and other severe weather events.

Can the Glass Be Repaired or Must It Be Replaced?

Because of the unique design of double-pane windows, it is not possible to spot-repair damage or replace just a single pane of glass and preserve the functionality of the window. A new, sealed Insulated Glass Unit (IGU) from the window manufacturer or an aftermarket producer will need to be installed to replace the damaged glass. However, the entire window does not necessarily need to be replaced. For example, if just the sash (the movable part of the window) is damaged, only that section will need to be replaced.

Repair Options & Techniques

If you are unable to replace the window right away, you might temporarily repair the glass with an adhesive to seal the cracks. However, until the sealed unit is replaced, the window will not function properly, so you’ll risk decreased efficiency of your HVAC system, reduced noise dampening, and moisture intrusion that could lead to mold or mildew.

Replacement: What’s Involved & When Is It the Best Choice?

Replacing glass in a double-pane window requires ordering a new IGU for the section of the window that is damaged. This should be sized to the existing window, and once it is ordered, the replacement should be a relatively smooth process for an experienced contractor.

Maintenance & Prevention Tips to Avoid Damage

While it is impossible to fully prevent any damage to your windows, you can take precautions like routinely inspecting your windows for any damaged seals or hardware. Windows that have compromised seals, rotting or damaged wood, or other damaged elements are more susceptible to further damage from the elements.

Contact the Pros at J&M Windows and Glass

If you have a broken window, J&M Windows and Glass is here to help. Contact us to discuss your options for replacement windows in San Jose.

Double Pane Window Repair FAQs

Can you remove just one broken pane in a double-pane window and leave the frame intact? You cannot simply replace a single broken pane in a double-pane window because the inner compartment will no longer be sealed. However, just one section of the window may be replaced with a new IGU. Depending on the size and style of the window, only part of the window may need to be replaced.

How much does it typically cost to repair a crack or chip vs replace a double-pane window? The cost of repairing a chip or crack is relatively low, but this is only a temporary repair for the window. Replacing the IGU in a double-pane window will range from $200-$1,000. If the entire window needs to be replaced, the cost will be higher.

How long does a repaired double-pane window last compared to a replaced unit? Double-pane window replacement will give you a brand new window that can last for 15-25 years or more. Replacing part of the window with an IGU will not likely impact the total lifespan of the existing window. Spot repairs are only temporary and should not be used as a permanent fix for a damaged window.

Will a repair affect the window’s energy efficiency or warranty? Replacing an IGU for a double-pane window may affect the window’s warranty. Before repairing the window, contact the manufacturer to assess if a warranty claim is possible for repair and find an authorized manufacturer for the new unit. Most manufacturers have approved technicians for window repairs to maintain their warranties. If the window is repaired with a properly installed IGU, the energy efficiency of the window should remain fully intact.

Is it safe to leave a cracked double-pane window until later, or should it be fixed immediately? Cracked windows should be repaired as soon as possible to ensure the security of your home and reduce the risk of damage from the elements.