Most Common Causes of Window Seal Failure

Windows are designed to prevent heated or cooled air from escaping to the outside. They should also eliminate drafts of cold or hot air coming in from the outside. With multiple glass panes, inert gas fills, and specialized coatings modern windows provide better energy performance than ever before. Unfortunately, even the best products don’t last forever. Eventually, window seals will break down and homeowners will need to invest in replacement windows in Del Mar, CA. Why? Here are the leading causes of window seal failure.


Over time the seals on old windows will wear out and start to fail. As caulking ages, it hardens and cracks. Weatherstripping can rub off. Inert gas will slowly leak out. Homeowners may be able to make minor repairs on damage caulk or weather stripping. But once the inert gas leaks out between the panes the only viable way to restore insulation is with window replacement.

Harsh Elements

The seals on modern windows are meant to withstand most weather conditions. But they do have certain limitations. When constantly exposed to moisture, some seals will lift away from the frame. This is made worse when seals are not flush with the frame. Moisture freezing and unfreezing will also wear out seals faster.


In addition to moisture, mold is a common factor in seal failure. It because with discoloration, but can weaken caulk and weather stripping. If caught early, homeowners can try cleaning away mold with mixtures of water and detergent. But it is important to stay away from harsh chemicals that can ruin the finish on window frames and lead to even more damage.

Extreme Temperature Fluctuations

Solar pumping occurs when the sun heats air between the panes on old windows. The air expands, forcing the panes to convex under the pressure. This puts added strain on the seals. Cold weather can do something similar. It contracts the air and causes the panes to cave inward. Eventually, all the fluctuations will wear the seals out, which is why windows don’t last as long in climates with extreme temperature fluctuations.

Improper Maintenance

Most modern windows require very little in the way of upkeep. But low maintenance does not equal no maintenance. It is still important to include window cleaning and maintenance as part of a regular routine. Otherwise, dirt and debris will buildup in all the wrong places and cause extended damage. Fortunately, homeowners can accomplish cleaning and maintenance with mild detergent, water, and a lint-free cloth as well as a silicone-based spray.

Faulty Installation

One mistake during installation could result in premature window failure. And no one wants to get more replacement windows just a few years down the road. That is why window installation is something that should be handled by a professional, someone who knows how to do the job right. It is meticulous work that takes proper training, skill, and the right tools.

If your windows are more than 15 years old and have started to develop seal failure it is time to get replacement windows in Del Mar, CA. Contact us at Pelican Replacement Windows.

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