Why Are Your Double-Paned Windows Becoming Discolored?

When your window uses double-paned glass, they are prone to discoloration issues. This happens as a result of moisture penetrating the thin layer of gas between the glass panels. Double-pane windows are designed to help keep your home cooler during hot days and warmer during cold days. They often have an inert gas, typically Argon or Krypton, trapped in a microscopic space between the panes. The gas helps prevent thermal conduction, thereby sealing your home’s thermal envelope from any leakage and making your home more energy-efficient.

When these gases leak out due to seal failure or just regular wear and tear, your windows and doors will begin to show signs pretty quickly. Here are our best tips on how to handle discoloration problems.

What Causes Discoloration?

Moisture is the number one culprit for discolored double-paned windows. It often starts in small barely noticeable sections, but gradually progresses into large streaks that cover large portions of the surface. This problem is more common in windows, but they can also affect doors, particularly the types that maximize the glass area, such as a sliding patio door.

Types of Discoloration

Dark marks are what’s typically observed, but it’s not uncommon to see white, orange, green or even black and brown mildew spots. These are often caused by the spread of mold and mildew colonies that thrive in humid areas.

Resolving Discoloration Issues

Unfortunately, discoloration is often a symptom of a much larger problem. It typically occurs because the caulk that keeps the gas in double-paned glass has failed. When this happens, the affected window or door must be replaced.

Renewal by Andersen® of Quad Cities is your number one go-to resource for energy-efficient and long-lasting doors and replacement windows. Give us a call at (309) 644-4769, or fill out our online contact form for a no-obligation, in-home consultation today. We serve homeowners in Moline, IL, as well as all neighboring areas.