A Colorado Home Refresh: Durable Fiberglass Windows Replace Aging Wood

After more than three decades, the original wood windows in this Lafayette home were showing their age. The homeowners were dealing with leaking frames, visible rot and moisture trapped between panes of glass. Beyond appearance, the windows were no longer performing the way they should. 

Rather than repairing individual units, they chose a full replacement of the top two floors. Their goals were straightforward: improve energy efficiency, eliminate maintenance concerns and invest in windows that would hold up long term in Colorado’s fluctuating climate.

For this project, the homeowners worked with the Pella Denver team to select fiberglass sliding and picture windows. Fiberglass windows are often chosen for their durability and resistance to warping, cracking and rot. 

In Colorado, where homes experience strong sun exposure, snow accumulation and seasonal temperature swings, material stability matters. Fiberglass frames are engineered to withstand expansion and contraction, helping the window maintain its seal over time. 

The homeowners also upgraded to argon-filled insulating glass. While invisible, this feature plays an important role in energy efficiency. Argon gas between the panes helps slow heat transfer, which can contribute to more consistent indoor temperatures during both cold winters and warm summers.

This project included a combination of sliding windows and picture windows. 

Sliding windows were selected in areas where ventilation was important. Their horizontal operation makes them easy to use, and they work well in rooms where exterior walkways or landscaping might limit outward-opening styles. 

Picture windows, which do not open, were used where the primary goal was bringing in natural light and preserving clear views. Because they have no moving parts, they provide a streamlined appearance and are often chosen for larger openings or where ventilation isn’t required.

Replacing all the windows on two levels of a home is a substantial project, especially when daily life continues inside. In this case, the homeowners were working remotely, which made timing, efficiency and organization essential. 

The installation team approached the project with a clear plan, completing the work on schedule while maintaining a clean and orderly jobsite throughout the process. Even with a large scope of replacement, the disruption to the household was minimized.

With the old wood windows removed, the interior immediately felt updated. The new fiberglass frames eliminated visible rot and staining, creating a cleaner, more consistent appearance throughout the home. Upgrading to argon-filled glass improved overall window efficiency, addressing the moisture issues that had developed in the original units. Instead of cloudy panes and compromised seals, the homeowners now have clear glass and a tighter envelope. 

From the exterior, the replacement windows refreshed the home’s curb appeal while maintaining its established character. 

For homeowners evaluating whether replacement is worth it, this project highlights a key point: when original windows begin to fail structurally and visually, replacement can improve both comfort and appearance at the same time.