Vinyl Versus Fiberglass Windows: Which Way to Go?

Windows are an integral structure in every home and office. Apart from using windows to let in light and fresh air, you can also use them to change your premise’s appearance drastically. Therefore, when it’s time to choose new or replacement windows for your project, you should carefully weigh your options.

Vinyl and fiberglass make two of the most popular composite materials for windows. Read on to learn the various factors you should consider when you select your window material.


Inert materials resistant to rot and insect infestation compose both materials. Nevertheless, fiberglass lasts longer than vinyl. Furthermore, even though plastic makes both frames, glass fortifies fiberglass frames and makes them stronger.

Fiberglass has less chance of seal failure since you source the material from glass. Therefore, the frames and panes expand and contract at the same rate with temperature fluctuations. In contrast, vinyl windows react to temperature changes at a different rate from glass, which causes cracking and seal failure.


Fiberglass doesn’t expand and contract significantly under heat, nor does it conduct cold or heat. That means it is a better insulator, thus allowing you to save more energy than with vinyl. Fiberglass also effectively insulates against sound. Hence, you should seriously consider the material for your windows if your premise is next to a noisy area.


Both materials are low maintenance. Regular clean-ups require you to scrub off any dirt, mold, or mildew with a sponge and warm water. Frequent sanitation prevents a build-up of problems and ensures you notice any issues before they escalate.

Fiberglass needs you to repaint as any existing paint peels and fades in the long run. Vinyl, too, contracts or warps and can create a poor air seal that you will need to fill periodically with caulk to keep the seal.

Vinyl is easier to install for replacements because the frames are flexible and easier to remove and replace.


Fiberglass is more energy-efficient, hence it reduces power consumption. In addition, the construction process doesn’t release health hazards into the environment. Further, you can make fiberglass from recycled glass and promote diminished glass waste in landfills and reduce the need for new glass production.

By contrast, vinyl production releases harmful chemicals. What’s more, polyvinyl chloride (PVC) plastic — the material used to make vinyl windows — is hard to recycle.

Appearance and Decoration

Vinyl isn’t elaborate. Instead, it is sleek and classy. It comes in various styles — custom, bow, bay, single-hung, and double-hung. On the other hand, fiberglass has a matte appearance and offers a wider variety of window appearances.

Fiberglass frames are thinner than vinyl and leave the glass more exposed to let in more natural light. Whereas both materials come in various colors, you can paint fiberglass but not vinyl. Additionally, you can texture fiberglass to look like wood, while vinyl always has a smooth appearance.

Fiberglass is an excellent choice for window construction and replacement compared to vinyl. Your final choice depends on your primary motivation and needs. Look no further than Fischer Window & Door Store for your quality window designs and numerous styles. We will gladly serve you if you give us a chance.