Differences Between Vinyl & Fiberglass Windows

The most popular materials for window replacements is fiberglass or vinyl. There are many benefits to both types of windows. They both provide good thermal resistance and require minimal to zero maintenance. Both types of windows are aesthetically pleasing and can boost curb appeal. So which should you choose?

Strength and Durability

Older vinyl windows have gained a back reputation for cracking and warping in our extreme temperatures. Technology and manufacturing has come a long way in recent years for vinyl windows. When you purchase them from a reputable manufacturer, your new vinyl windows will be able to withstand the climate and last for years to come.

Fiberglass windows are stronger than vinyl windows and has never had the warping issue. According to The Spruce, fiberglass windows can last 38 per cent longer than vinyl.

Energy Efficiency

Both vinyl and fiberglass windows offer excellent thermal performance and their insulating factor is equal. Both types have spaces that can be filled with high-tech insulated spacers and thermal resistant argon gas. If your windows are ENERGY STAR certified for your climate zone, you can expect them to perform well for energy efficiency regardless of whether they are fiberglass or vinyl framed.


Fiberglass windows are usually more expensive than vinyl windows. Fiberglass windows are also not typically found at the hardware store or local building supply store, unlike vinyl or wood windows, which makes them less accessible for DIY installation.

This is because they have a more lengthy and complicated manufacturing process compared to vinyl windows. It is also why most fiberglass windows are available for purchase from a manufacturer and they will offer installation services.


Both window types are pretty low maintenance. Both are resistant to rot, moisture and insects (unlike wood frames) and any dirt or mildew that collects on the window frame can be easily cleaned with a wet cloth and all-purpose cleaner.


Both window types come in a range of colours and finishes, including a faux wood grain finish. Vinyl windows come in a variety of ‘baked-in’ colours but can not be painted. You can paint fiberglass windows, which is a nice option if you ever want to change the look of your home’s exterior.

For more information on a window replacement, contact window companies in Winnipeg.



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