Why Choose Fiberglass

Fiberglass replacement windows are made of composites that combine two or more materials to produce a stronger, longer lasting, and more energy-efficient frame. Recent engineering and manufacturing enhancements turn out windows that meet the demands of home and business owners, as well as the construction industry.

These demands include:

The Thinness of the Frame – One of the challenges in window-making is to use only as much frame as is necessary to stabilize the window, leaving as much available space as possible for glass. This is something composite materials do very well. These stiff and strong materials provide the necessary support in a thinner frame, opening up the window to support an increased view of the outdoors and let in more light.

A Stronger Frame – Other engineering enhancements include strengthening the frame, so it does not sag due to weight or shift due to a change in temperature.
This strength is especially important in commercial applications from multi-unit housing to tall windows in multi-storied buildings.

No Reaction to Water – Fiberglass windows and doors don’t react to water by swelling or shrinking. This means you don’t have to worry about windows that are subject to rot, mold, or corrosion.

Energy Efficiency – Fiberglass windows are strong enough to support three or four panes of glass instead of one or two. This increases energy efficiency as the air that’s trapped between the panes acts as additional layers of insulation.

Provo Fiberglass Composite Windows 4

Our Windows Installers are InstallationMasters™ Certified Installers

The Window Installation Specialists installers are all certified InstallationMasters™, so you know they have significant window installation experience and are properly trained and skilled; they are technically carpenters. Our installers are specialists who have also completed nationwide training and certification replacement windows and exterior glass doors in residential and light commercial markets.

Our window replacement experts care about their work. Unlike many of our window replacement competitors, our window installers are not independent contractors, but full-time employees of Window Installation Specialists. Our uniformed window installers are fully insured with general liability, auto, and worker’s compensation too.

A-Series

a awning cat

Awning

  • Weather-resistant design makes this our best-performing awning
  • Wide array of style options including factory-finished wood interiors for architectural authenticity
  • Triple-pane glass options provide exceptional energy efficiency
a series casement cat

Casement

  • Weather-resistant design makes this our best-performing casement
  • Wide array of style options including factory-finished wood interiors for architectural authenticity
  • Triple-pane glass options provide exceptional energy efficiency
a series double hung 380x351

Double-hung

  • Our best-performing double-hung.
  • Wood protected by fiberglass and Fibrex® composite material.
  • Designed for architectural authenticity.
  • Standard sizes up to 4′ wide and 8′ high. Custom sizes available.
a series picture cat

Picture

  • Our best performing picture window.
  • Wood protected by fiberglass.
  • Beautiful wood options for architectural authenticity.
a frenchwood gliding door cat

Best performing

  • Wood protected by fiberglass exterior
  • Great at matching classic architecture
  • Blinds-between-the-glass option
  • Available with both contemporary and traditional panel styles.
a frenchwood hinged door cat

Hinged patio door

  • Maximizes space with the ability to open into a room or outward to best fit your home’s layout.
  • Six stained or painted interior wood options protected by fiberglass exterior.
  • Single panel, 2-panel, and 3-panel options.
  • Blinds-between-the-glass option.
  • Available with both contemporary and traditional panel styles.

frequently asked questions

What are the benefits of choosing fiberglass windows from Andersen, Marvin, or Pella?
Fiberglass windows are highly durable, energy-efficient, and resistant to extreme temperatures and moisture. Andersen, Marvin, and Pella all offer top-quality fiberglass windows that require minimal maintenance and provide long-lasting performance.
What are the key differences between Andersen, Marvin, and Pella fiberglass windows?
  • Andersen: Offers composite windows made from Fibrex, a material that combines fiberglass and wood fibers for enhanced durability and thermal performance.
  • Marvin: Known for their Ultrex® fiberglass windows, which are extremely strong, low maintenance, and offer excellent energy efficiency.
  • Pella: Features Impervia® fiberglass, which is known for its toughness, design flexibility, and resistance to warping and corrosion.
Are fiberglass windows more durable than other window materials?
Yes, fiberglass is one of the strongest materials for windows, outperforming wood, vinyl, and aluminum in terms of longevity and resistance to environmental factors like temperature fluctuations, moisture, and UV exposure.
Do fiberglass windows require much maintenance?
Fiberglass windows from Andersen, Marvin, and Pella are low-maintenance. They do not warp, crack, or corrode, and they typically require only occasional cleaning. Unlike wood windows, they don’t need to be painted or stained unless desired for aesthetic purposes.
Are replacement fiberglass windows energy-efficient?
Yes, all three brands offer fiberglass windows that are highly energy-efficient. They provide excellent insulation and can be equipped with low-E coatings and double or triple-pane glass to help reduce energy costs and improve home comfort.
Can fiberglass windows be customized to fit my home’s design?
Yes, Andersen, Marvin, and Pella offer a variety of customization options for their fiberglass windows, including different sizes, shapes, finishes, colors, and grille patterns to match any home style, from traditional to contemporary.
Are fiberglass windows from Andersen, Marvin, and Pella available in custom sizes?
Yes, all three brands provide custom-sized fiberglass windows, ensuring a perfect fit for both standard and unique window openings, making them suitable for any home renovation or replacement project.
How well do fiberglass windows perform in extreme weather conditions?
Fiberglass windows are designed to withstand harsh climates. Andersen, Marvin, and Pella fiberglass windows are resistant to temperature extremes, moisture, and UV rays, making them ideal for areas with fluctuating weather or coastal environments.
How do fiberglass windows compare in price to other materials?
Fiberglass windows are typically more expensive than vinyl windows but less expensive than high-end wood windows. On average, fiberglass windows from Andersen, Marvin, or Pella range between $600 and $1,500 per window, depending on size, customization, and installation costs.
What warranties do Andersen, Marvin, and Pella offer on fiberglass windows?

All three manufacturers offer warranties on their fiberglass windows:

  • Andersen: Provides a 20-year limited warranty on glass and a 10-year warranty on other parts.
  • Marvin: Offers a 20-year warranty on glass and a 10-year warranty on other components of their Ultrex fiberglass windows.
  • Pella: Includes a limited lifetime warranty on Impervia fiberglass windows for added peace of mind.