If you live in Texas, your windows are under constant stress from our extreme climate. Understanding why window seals fail can help you make informed decisions about maintenance and replacement.
The Anatomy of a Double-Pane Window
A double-pane window (also called an insulated glass unit or IGU) consists of two panes of glass separated by a spacer bar, with the space between filled with air or argon gas. The entire assembly is sealed with primary and secondary sealants to create an airtight unit.
Why Texas Is Tough on Windows
Temperature Extremes
Dallas-Fort Worth experiences temperature swings from below freezing to over 110°F. Each temperature change causes the glass and sealants to expand and contract at different rates, creating stress on the seal.
Solar Pumping
When the sun heats a window, the gas inside expands, pushing outward on the glass. When the window cools, the gas contracts, pulling the glass inward. This daily cycle — called solar pumping — gradually weakens the seal over thousands of repetitions.
UV Degradation
Texas receives some of the highest UV radiation levels in the country. UV rays break down the organic compounds in window sealants, causing them to become brittle and crack.
Humidity
The DFW area's humidity levels fluctuate significantly throughout the year. This moisture exposure accelerates seal degradation, especially on south and west-facing windows.
Average Seal Lifespan in Texas
While window manufacturers often warranty seals for 10-20 years, the actual lifespan in Texas conditions is typically:
- •South/West-facing windows: 10-15 years
- •North/East-facing windows: 15-20 years
- •Shaded windows: 20+ years
Prevention Tips
While you can't prevent seal failure entirely, you can extend seal life by:
- •Maintaining proper exterior caulking
- •Ensuring adequate roof overhangs for shade
- •Using window films on high-exposure windows
- •Addressing any drainage issues around windows
When Seals Fail
Once a seal fails, the only permanent solution is replacing the insulated glass unit. At Apex Windows, we specialize in this exact service, replacing just the glass while keeping your existing frames. Call (214) 263-3008 for a free assessment.