Why Do My Window Panes Keep Popping?

Pressure

• On hot days, pressure builds up between the double panes of glass windows. As the pressure builds, the seals can pop loose. Sometimes, the pressure is strong enough to dislodge the glass from its sealing entirely. This is called heat pumping, and it is rarer than other causes that result in popping windows.

Temperature Changes

• Both high and low temperatures can cause windows to pop from their seals. In the heat, materials expand, while in the cold, they contract. This would be fine if all of the materials expanded and contracted at the same rate, but glass expands and contracts less swiftly than vinyl, metal or wood. Because of this, the glass could pull away from the other materials, causing leaks.

Material Failure

• Sometimes the sealant that runs around the window itself fails. If the caulking material is old or if an inappropriate sealant was used, it might fail over time. The material might dry out and crumble away or it might crack over long-term exposure. Direct sunlight and harsh weather conditions take their toll on the sealant, making it more fragile.

Considerations

• When putting in new windows, choose windows that come with a warranty. If you are having your windows installed professionally, ask for a personal guarantee regarding the window's stability. Depending on the degree to which the popping has affected the window, the entire window may need to be replaced.