Fiberglass vs Aluminum Window Frames

Windows | 16 April 2025
Understanding the different qualities and performance metrics between fiberglass and aluminum windows.

Selecting the right window frames is an important decision that affects the durability, energy efficiency, and overall look of a property. Fiberglass and aluminum window frames are two popular options, each with its advantages. As experienced window and door specialists in the Okanagan, Adera Windows & Doors help homeowners, builders, and strata managers find the best solutions for their projects. That is why we have outlined the key differences between fiberglass vs aluminum window frames.

Learn more about the pros and cons of different window frame materials.

Comparing Fiberglass and Aluminum Window Frames

1. Durability and Strength

Fiberglass frames are known for their exceptional strength and resistance to warping, cracking, or expanding with temperature changes. This makes them ideal for extreme weather conditions. Aluminum frames, on the other hand, are highly durable and resistant to impact but can be prone to corrosion in coastal environments if not properly treated. The importance of window placement also plays a role in durability, as windows exposed to harsh weather may require more resilient framing materials.

2. Aesthetic Appeal

Both fiberglass and aluminum offer sleek, modern aesthetics. Fiberglass can be painted in various colours and often mimics the look of natural wood without maintenance. Aluminum frames provide a slim profile that maximizes glass space, offering a contemporary look with minimal framing. They are typically available in a range of powder-coated finishes for a stylish and long-lasting appearance.

3. Energy Efficiency

Fiberglass windows enhance energy efficiency by offering superior insulation due to their low thermal conductivity. They help prevent heat transfer, keeping indoor temperatures stable and reducing energy costs. Aluminum, while strong and lightweight, conducts heat more easily, which may result in higher energy loss unless paired with thermal breaks or insulation.

4. Maintenance and Longevity

Fiberglass requires minimal maintenance, typically lasting anywhere from 30-50 years with very little maintenance, as it does not expand, contract, or degrade over time. It is also resistant to moisture and UV damage. Aluminum frames are also low-maintenance but typically last from 20-30 years, as they may require additional treatments in high-humidity or salt-exposed areas to prevent corrosion.

5. Cost Considerations

While aluminum frames tend to be more budget-friendly upfront, fiberglass frames can provide long-term savings due to their superior insulation properties and lower maintenance needs. The overall cost will depend on factors such as frame design, installation requirements, and energy efficiency goals.

Choosing between fiberglass and aluminum window frames depends on your priorities for durability, efficiency, and style. At Adera Windows & Doors, we offer a range of high-quality window options tailored to your needs. Contact us today to explore the best window solutions for your home or building project.


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