Fiberglass Windows
Fiberglass windows consist of strands of extremely fine glass fibers made from silica sand, limestone, and soda ash. These strands are woven together, pulled through a resin bath, and then placed in a heated die to cure. The frames have air cavities that can be filled with foam or a hollow core, providing excellent insulation, while the frame expands and contracts at the same rate as the glass window pane it holds. This minimized expansion and contraction reduces the leakage of air, making fiberglass an extremely energy-efficient window material.
Top Fiberglass Window Benefits
- Fiberglass windows provide the highest level of energy efficiency available.
- Fiberglass is extremely durable with a lifespan of 50-80 years.
- Fiberglass doesn’t warp, crack, or rust and is extremely difficult to damage.
- These windows are available in a range of styles and colors perfect for any home design.
- Fiberglass is environmentally friendly and a great choice for eco-conscious homeowners.
The Finest Fiberglass Manufacturer Chosen For You
Let us use our experience and industry knowledge to your benefit. With over 30 years in the window industry, time has allowed us to determine the clad-wood manufacturer’s who deliver the best blend of quality and price, or best VALUE for you. Our chosen manufacturer partners create value in four essential areas: consistency of quality and service over the years, level of warranty support to you, industry longevity, and product innovation. Our valued manufacturer partners for clad-wood windows is:
The Milgard Ultra Series fiberglass windows are top of the line when it comes to window technology. Fiberglass is an eco-friendly window material that provides the highest energy-efficiency levels available. Fiberglass is made primarily of silica sand, an abundant natural resource. Glass is made primarily of sand. Thus the frame and glass expand and contract at roughly the same rate while remaining resistant to swelling, rotting, and warping, allowing for a longer lifespan.
Features and Benefits:
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Extremely durable with an expected lifespan of nearly 80 years.
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Strong frame material allows for large custom sizes
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Paintable frames that homeowners can update to match current home color trends
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Low expansion/contraction rate through 100-degree temperature changes means less glass and caulking failure over time
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An Energy Star package tailored to the Seattle region for optimal energy efficiency.
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Custom colors, hardware, and glass options to match any home design.
Milgard Ultra Series C650 Fiberglass Windows
| Window Configurations | Combinations | Hardware Features | Color Options | Grid Options | Glass Textures | Tint Options | Screen Options |
| Picture window Picture window 2-lites verticle Picture window 2-lites horizontal Picture window 3-lites verticle Picture window gable Picture window 3-lites horizontal Picture window gable triangle Picture window hexagon Picture window octagon Gable (3-side, 4-side, 5-side) |
4-sided gable and square picture windows Picture window over awning 4-sided gable windows over picture windows |
Folding Nesting Operator Sash locks |
Interior Colors White (any exterior color) Harmony (harmony exterior only Bark (bark exterior only) Black bean (black bean exterior only) Exterior Colors |
Interior Grids Flat GBG Grid Sculptured GBG Grid 3/4″ Vintage SDL 1-1/8″ Vintage SDL 1-1/8″ Craftsman SDL 1-1/8″ Legacy SDL Exterior Grids |
Obscure Aquatex Obscure Clear 42 Obscure Delta Frost Obscure Frosted Glue Chip Obscure Glue Chip Obscure Matelux Obscure Narrow Reed Obscure P516 Obscure Rain |
Cardinal Low-E Solar Bronze Solar Gray |
Standard Mesh PureView Mesh |
| Milgard Ultra Series C650 Fiberglass Picture Window Size Chart | |||||||
Comparing Fiberglass to Vinyl and Clad-Wood Windows
When compared to other window materials, we consider fiberglass to be the highest quality material available. It provides optimal levels of performance and durability along with a considerable number of design options.
While fiberglass is certainly more energy-efficient and durable than vinyl window materials, it’s also significantly more expensive. Because of this, we recommend fiberglass windows to homeowners who want the best material money can buy and vinyl windows for homeowners who desire comparable performance at a more affordable price.
When deciding between fiberglass and clad-wood windows, the decision boils down to your design preference. While fiberglass outperforms vinyl clad-wood windows, they are better suited for modern home designs whereas clad-wood windows are an excellent choice for traditional home designs.
| Milgard Ultra Series | Milgard Tuscany Series | Milgard Trinsic Series | Andersen E-Series | |
| Frame Material | Fiberglass | Vinyl | Vinyl | Aluminum Clad Wood |
| Strength | Excellent | Excellent | Very Good | Excellent |
| Durability | Excellent | Very Good | Very Good | Very Good |
| Large Size & Custom Designs | Excellent | Very Good | Good | Excellent |
| Energy Efficiency | Excellent | Excellent | Excellent | Excellent |
| % Glass to Frame |
Excellent |
Very Good | Excellent | Very Good |
| Curb Appeal | Excellent | Excellent | Excellent | Very Good |
| Exterior Colors | 6 | 7 | 7 | 50 |
| Warranty | Excellent | Excellent | Excellent | Very Good |
| Price | $$$$ | $$$ | $$ | $$$$ |
Top-Rated Window Replacement Services
At Lake Washington Windows and Doors, we offer the highest quality windows and unparalleled customer service. With each installation, our exclusive Leak Armor Installation provides superior protection around your window openings. When you choose us for your window installation project, you can be sure that you’re getting the best.
Financing Options with Convenient 10 Minute Approvals
In addition to special offers and promotions, ask our sales representative about our quick, digital financing application process. From low-interest traditional loans to no down-no payment-no interest deferred financing plans, we can help you fund your replacement window project so you can mobilize your cash for other investments. We are a proud partner of Enerbank Finance, the largest lender for the home improvement industry. See how much you can be pre-approved for.
Every Window Includes a Limited Lifetime Warranty
The beauty of working with the top window manufacturers in the industry is the support you can expect before, during, and after installation. Both Milgard and Andersen offer limited lifetime warranties. However, the likelihood that you’ll need to take advantage of these warranties is low.
Milgard Lifetime Warranty Guarantee
Milgard’s award-winning windows and doors are built to last. However, if you ever encounter an unexpected problem, you can rest assured that their lifetime warranties cover your purchase.
Andersen Limited Lifetime Warranty Guarantee
Andersen prides itself on crafting durable, long-lasting products. That resilience allows them to offer some of the best warranties in the industry. They're even transferable should you sell your home. With Andersen’s exclusive Owner-to-Owner® limited warranties, you get peace of mind plus real added value.
Receive Our Patented Leak Armor Protection with Every Installation
We include our patented Leak Armor protection with every window we install. Developed through thousands of customer installations and years of experience, we utilize layers of flashing, pans, and sealants in a specific manner to provide commercial-grade sealing to residential homes.
Fiberglass Window FAQs
Are Fiberglass Windows better than vinyl?
From a performance perspective, fiberglass outranks vinyl in strength, durability, energy efficiency, and maintenance. However, when considering the cost and desired aesthetics of your windows, choosing which material is “better” comes down to a homeowner’s personal preference.
Are Fiberglass Windows worth it?
The popularity of fiberglass windows is higher than ever. While the upfront cost is more significant, fiberglass provides benefits that vinyl windows simply do not. If you’re willing to spend the money upfront and reap the return on investment over time, then fiberglass windows are a worthwhile option for you and your home.
Are Fiberglass Windows better than clad-wood?
When deciding between fiberglass and clad-wood windows, the decision boils down to your design preference. While fiberglass outperforms vinyl clad-wood windows, they are better suited for modern home designs whereas clad-wood windows are an excellent choice for traditional home designs.
What style and color options are available with fiberglass windows?
Fiberglass is a versatile material that can be molded and configured into most window styles. Milgard offers a range of interior and exterior colors along with several different glass textures and window grids. Visit our window style page to explore the fiberglass options we provide.
Are fiberglass replacement windows durable?
Fiberglass windows do not very damage easily. They will resist dents, scratches, warping, rotting, and corroding. The material is also strong and rigid, allowing fiberglass windows to be up to eight times stronger than vinyl windows and require much less maintenance.
