Debunking 7 common fiberglass window myths
Thinking about new windows for your home? Many homeowners are looking for energy-efficient and durable replacement options, which is why fiberglass windows have become increasingly popular. The problem is there's a lot of misinformation out there. Let's take a closer look at these seven common misconceptions about fiberglass windows.
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Myth #1: Vinyl windows are just as durable as fiberglass
One big difference between vinyl vs. fiberglass windows is fiberglass is significantly stronger than vinyl. This superior strength prevents warping and operational issues that commonly develop with vinyl windows over time. While vinyl expands and contracts substantially with temperature changes, fiberglass resists expanding and contracting through extreme weather conditions — ensuring your windows work as smoothly years later as they did on installation day.
Myth #2: Fiberglass windows require more maintenance
Unlike wood windows, which demand regular maintenance, replacement fiberglass windows are virtually maintenance-free. Quality fiberglass windows feature durable gel or acrylic finishes that resist denting, chipping, scratching, and fading. When comparing fiberglass vs. wood windows, fiberglass window maintenance is minimal, often involving simple cleaning. Some designs even include easy-clean features that further simplify occasional maintenance, saving you time and money over your home's lifetime.
Myth #3: Fiberglass windows cost more than other materials
The initial price of fiberglass windows can surprise some homeowners, as they sometimes cost more upfront than vinyl. But, thinking of windows as a one-time purchase price misses the bigger picture. Energy efficient fiberglass windows help lower your utility bills month after month. They don't need constant maintenance or early replacement like cheaper vinyl or composite options. And remember — you'll look through these windows every day for decades. When you consider these lasting benefits, fiberglass windows prove to be a smart choice.
Myth #4: Fiberglass windows don't perform well in extreme temperatures
Quality fiberglass windows can withstand high temperatures without warping — heat resistance that vinyl simply cannot match. In cold conditions, fiberglass provides superior insulation because it expands and contracts at nearly the same rate as the glass itself (very little). This ensures windows maintain their tight seal and energy efficiency even during severe temperature fluctuations, preventing air leaks and seal failures that compromise comfort in lesser materials.
Myth #5: All fiberglass windows perform the same
Not all fiberglass is created equal. Two products may share the "fiberglass" label, but it doesn't mean they'll perform the same way in your home. Manufacturers use vastly different production techniques, finishing processes, and sealing methods that can impact both performance and appearance. Some finishes may fade or deteriorate with sun exposure, while superior sealing technologies prevent moisture intrusion and maintain structural durability. Infinity from Marvin puts extra care into our Ultrex® fiberglass, and it shows in ways that matter — windows that don't fade, less upkeep over time, and frames that simply function better for decades.
Myth #6: Fiberglass windows can't match the look of wood
Many homeowners don’t want to give up the warm, traditional look of wood windows. It's a valid concern, but today's fiberglass technology offers some impressive solutions. Take Infinity's EverWood® interior finish, for example. It gives you the natural appearance of wood without all the maintenance headaches. You can even stain it to match your existing woodwork, keeping those traditional details and profiles that make your home unique. Plus, because Ultrex fiberglass is so strong, you get slimmer frames that let in more light and give you better views.
Myth #7: All window companies provide the same level of service
Who installs your windows can matter just as much as what windows you choose. The best window manufacturers know this, which is why Infinity from Marvin has built a network of skilled fiberglass window installation experts who really understand your local climate and building styles. When you work with installation specialists who know what they're doing, you'll get windows that are properly sealed and fitted — keeping your home energy-efficient. Remember, even the best windows won't perform well if they're not installed correctly. Additionally, a manufacturer offering a detailed warranty gives you peace of mind that your windows will continue performing as promised for years.
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The Infinity difference
Your home deserves windows that combine beauty, durability, and efficiency without compromise. Fiberglass windows from Infinity offer the perfect balance of these qualities, backed by Marvin's century-long legacy of craftsmanship.
Ready to get started?
Connect with a local Infinity consultant today for your free no-obligation consultation and discover how windows designed with Ultrex fiberglass can transform your home.