WeatherGard Commercial Grade Vinyl vs. Fiberglass Windows


You'll need flash to play this video.

Buy A Stronger Window

WeatherGard's commercial grade replacement windows are so strong, we proudly put it to the test against any fiberglass window. We invite you to visit the WeatherGard factory and see how our commercial grade replacement windows are made, and witness the impressive strength of commercial grade vinyl in person.

A Uniquely Robust Product

No other Southeast Michigan window manufacturer or contractor is offering a window as strong or as long-lasting, least of all those companies selling the weakest replacement windows of all—those made of fiberglass.



  WeatherGard Vinyl Fiberglass
Lower U-factor √
Strong, fusion-welded joints √
Weak, screwed and glued joints √
May chip & crack √
Requires paint √
Maintenance free √
Approved for high rise applications √

Be Better Insulated From the Cold

Vinyl windows do a better job insulating your home than pultruded fiberglass windows. Unlike the pink fiberglass bats you see in your attic, which trap heat in small pockets, the frames used to make fiberglass windows are made out of compacted fiberglass which cannot trap air, reducing the frame's effectiveness as an insulator. In fact, studies have shown that fiberglass materials transfer 3 to 4 times as much cold as the vinyl material used in our windows.

Get the Strength of Fusion Welded Corners

If corner joints are created mechanically (using glue and screws), they'll eventually fail. Fiberglass joints have to be mechanical because the material can't be welded. As a result, service issues with fiberglass windows are both more frequent and more severe than with vinyl windows. See for yourself—check out the number of service issues listed by the Better Business Bureau for any established fiberglass window company.

It's actually not difficult to break a fiberglass corner joint with bare hands. So, imagine what happens when Michigan's seasonal weather extremes cause structural shift in a home, placing the windows under severe strain. We encourage you to come to our factory and see how we fusion weld our windows (and you're welcome stand on a corner joint, if you like).

Fiberglass Can Chip & Crack

Fiberglass is very brittle and can crack and chip very easily. WeatherGard's commercial grade GardTech™ windows are guaranteed against chipping and cracking for as long as you own your home.

Never Paint A Window Again

The materials used to make the fiberglass resins that make up a fiberglass window are not stable when exposed to the suns ultraviolet rays, which means that, all fiberglass windows (even white ones) require maintenance and painting every few years Since fiberglass windows are painted, the finish is not resilient and very prone to scratching during assembly, shipping and installation. Because they have to be painted, fiberglass windows are not nearly as maintenance free as WeatherGard's commercial grade GardTech™ vinyl windows.

WeatherGard windows perform in large buildings where forces dwarf those in single family homes.

Approved for High Rise Applications

WeatherGard's GardTech™ commercial grade windows are so strong that we have even installed them on high rise apartments, such as the Alden Apartments and the The Park Apartments (see illustration), in which we've installed thousands of the very same replacement windows that we're offering you. If our windows can withstand the wind and structural forces present in a 16-story building, you can bet it’ll be strong enough to last decades in your home.