Fiberglass Windows
Extreme durability meets modern good looks. Fiberglass is one of the strongest, most stable window frame materials available today.
Why Choose Fiberglass Windows?
Fiberglass frames are made from glass fibers and resin, combining exceptional strength with remarkable stability. Because fiberglass expands and contracts at nearly the same rate as glass, the frame and glass move together, so seals stay tight and airtight for decades.
Fiberglass won't rot, warp or corrode, and it holds up through hot summers and freezing winters. Its insulating performance rivals wood without the upkeep, and many frames can be foam-filled for even better efficiency.
Extreme durability
Won't warp, crack, peel or corrode, even in harsh conditions.
Dimensional stability
Moves with the glass through temperature swings, so seals stay intact.
Weather-proof
Shrugs off moisture, UV and temperature extremes.
Low maintenance
The finish resists fading, and an occasional cleaning is all it needs.
Fiberglass Technology & Features
Pultruded frames
Glass fibers are pulled through resin and heated dies, lining them up lengthwise for a frame that's strong and rigid yet lightweight and easy to operate.
Moves with the glass
Fiberglass expands and contracts almost exactly like glass, so there's far less stress on seals than with vinyl or aluminum. That means fewer seal failures, drafts and leaks over time.
Foam-filled insulation
Hollow frame chambers can be filled with insulating foam for exceptional energy performance, a stiffer frame and a quieter home.
Won't rot or corrode
The same tough material used in boat hulls. No metal to rust, no wood to rot and no vinyl to break down in the sun.
Durable, paintable finish
Factory finishes are built for outdoor exposure and resist fading. Unlike vinyl, fiberglass can be repainted later if you want a new color.
Slim frames, more glass
Its strength allows narrower frames than vinyl or wood, giving you more glass, better views and more natural light.
How Fiberglass Compares
| Fiberglass | Vinyl | Aluminum | Wood | |
|---|---|---|---|---|
| Strength | Excellent | Good | Excellent | Very good |
| Thermal expansion | Lowest (matches glass) | High | Very high | Moderate |
| Energy efficiency | Excellent | Good | Fair (best with thermal break) | Excellent |
| Moisture resistance | Excellent | Good | Excellent | Needs protection |
| Maintenance | Minimal | Minimal | Minimal | Regular paint or stain |
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Perfect For
Big temperature swings
Holds its shape and seals from hot summer days to freezing winter nights.
Wet winters and full sun
Moisture and UV won't break it down, so it's ideal for exposed walls.
Contemporary design
Narrow profiles and clean lines with plenty of glass.
Long-term investment
A higher upfront cost, but a frame built to last for decades.
Experience Ultimate Window Performance
Invest in some of the strongest, most durable windows available. Request a free estimate to see the difference.