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The Common Causes of Window Seal Failure

Insulated windows are equipped with sealed double-pane glass. Sometimes, the seals could fail, resulting in reduced energy efficiency. Here’s a look at the causes of window seal failure.

How Do Window Seals Work?

Traditional single-pane glass has always been problematic because the largest component, glass, is highly conductive. It allows precious indoor heat to escape during cold days. It also lets heat seep into the house during warm days. Windows with single-pane glass increase indoor heating and cooling requirements, which result in higher monthly energy costs.

Insulated windows, on the other hand, feature double-pane glass: two glass panes, separated by an insulated spacer, are assembled so there’s a sealed vacuum inside. With no molecules to conduct heat, double-pane glass helps maintain consistent indoor temperatures, reducing the need for the HVAC system to compensate. It has proven to be so effective that all Renewal by Andersen® replacement windows are equipped with double-pane High Performance™ Low-E4® glass packages. 

Common Causes of Window Seal Failure

Even the best window seals can fail due to one or more causes:

  1. Age — Window seal technology has taken leaps and bounds over the years. Newer windows are far less likely to fail due to age. We at Renewal by Andersen are confident of the seals we use on our replacement windows that our limited warranties include a 20-year coverage for the glass packages.

  2. The Elements — Window seals can be jarred loose or damaged by wind and driven rain. Lack of protection from ultraviolet (UV) rays can deteriorate the window seal. Fortunately, it can be repaired. The earlier you notice the damage, the less repair work will be needed.

  3. Mold — Mold growing on the windows can weaken the seal and cause discoloration. A mildly acidic cleaning solution, such as diluted white vinegar, can be an effective way to remove mold. If your windows came with factory-applied coatings, read the care and maintenance manual if vinegar will affect the paint coatings.

  4. Lack of Maintenance — More than a few homeowners confuse “low maintenance” with “no maintenance”. Windows still need to be cleaned and maintained; it’s just easier when you have low-maintenance windows. This means you will need to stick to a regular cleaning and inspection routine as prescribed by your contractor.

Renewal by Andersen of St. Louis is your leading provider of replacement windows and patio doors. Give us a call at (314) 332-2364, or fill out our contact form. We serve customers in Chesterfield, MO, and nearby areas.

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"We had a large picture window and two side windows replaced. Everyone from the person who took our order to the installers were top notch. We got exactly what we wanted. Granted, we had to wait a few months, just like you do for everything these days, but we were told that up front. The windows were well worth the wait. We've replaced windows before by going to home maintenance stores. Don't waste your money on those. Our Renewal by Andersen windows look great, they operate like a dream, and are worth every penny. Quality through and through."

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