When a home holds decades of stories, every detail matters. That’s why these homeowners trusted Optimum Window to bring new life to their cherished arched stained glass windows.
By using our RTS-430 thermally broken steel, we were able to refurbish the existing configuration without compromising its timeless beauty.
The results? A perfect combination of historical charm and modern performance.

Why RTS-430 Steel Was the Perfect Choice
Our RTS-430 series is built for projects where energy-efficiency meets architectural preservation. This system features:
- Thermally broken design to reduce heat transfer
- Slim sightlines that highlight the glass and maintain historical aesthetics
- NFRC-certified energy performance for improved insulation
- Custom fabrication to fit unique shapes, like these arched frames
By integrating modern insulated glass within the original arched openings, the homeowners now enjoy a cozier, more efficient space—all while keeping the original character intact.

Breathing New Life into Stained Glass
Preserving stained glass isn’t just about aesthetics. Over time, older steel frames can warp or leak, which threatens both the glass and the home’s energy performance.
With RTS-430 steel:
| Feature | Benefit to Homeowner |
|---|---|
| Thermally Broken Frame | Keeps indoor temperatures stable |
| Slim Sightlines | Maximizes natural light and glass beauty |
| Structural Strength | Supports heavy, original stained glass |
| Long-Term Durability | Extends the life of heritage windows |
This restoration allows the stained glass to shine brighter than ever, protected by a strong and efficient steel system built to last for generations.
Think Optimum Window for creative steel solutions. Whether it’s restoring a historic masterpiece or crafting a modern architectural feature, we bring energy-efficient strength and timeless style to every project.