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Fiberglass windows outperform wood and vinyl.
Every Time.  All the Time.  For a Lifetime.

Wondering if fiberglass is a good choice for your replacement windows? Consider this: boats, bridges, cars, and trucks are all built from this high performance material. No other material is as strong, as durable, as weather resistance, or lasts as long as fiberglass. Fiberglass is an ideal material for many products and especially for windows and doors. For all the reasons you are considering replacing your existing windows and doors, FiberFrame designs provide you with lasting solutions – strength, durability, air and water tightness, ease of operation, resistance to heat and cold, low maintenance – the list goes on and on.

Fiberglass Replacement Windows

Fibreglass is :

It is 8x stronger than vinyl, 3.5x stronger than wood/vinyl composites and 2x stronger than aluminum.

Less thermal conductibility than aluminum (500x less), so it doesn’t allow heat or cold from the outside into your home.

Almost zero thermal expansion rate (essentially the same rate as glass) means tighter seals against weather and longer lasting. Vinyl expands at over 7x this rate.

Virtually maintenance-free frames stay true to form due to strength of materials. No need for sanding, painting, or staining.

Less energy and resources to manufacture. Made from partially recycled materials.

Won’t discolor, warp, rot, corrode, dent, or rust. Can withstand winds up to 203 mph, and does not absorb moisture.

Because of the strength of the fiberglass, the frames are slimmer allowing more visible glass area in each window.

Offered in virtually unlimited colors and an interior wood veneer.

Frame Materials


Air, Water, and Structural Performance

All EcoFiber windows and doors are tested and certified to standards and specifications developed by the American Architectural Manufacturers Association. Comfort Line Ltd takes the additional step of participating in AAMA’s certified products labeling system. This label provides you with assurance that the EcoFibre product you select will perform the first time, and for a lifetime.

Structural Properties

Strength and Durability
Fiberglass window and door frames are the strongest of all common alternative materials: aluminum, wood, and vinyl. This allows for longer lasting performance, elimination of frame reinforcement members, more glass area with larger window openings and a slimmer frame.

Thermal Performance

All of the FiberFrame line of products meet or exceed performance standards set by the US Environmental Protection Agency’s Energy Star program. Additionally, FiberFrame designs are rated and labeled through the National Fenestration Rating Council , the only uniform, independent rating and labeling system for the energy performance of windows and doors.

Thermal Properties

Thermal Expansion and Contraction Fiberglass window and door frames are comparable to glass, and have the lowest rate of expansion and contraction compared to alternative materials.The result is superior weather-seal performance over a wide range of seasonal temperature changes, smooth opening and closing operation, and consistent alignment of the sash to frame.

Insulating Performance

Fiberglass is an excellent insulator. Windows and doors made with fiberglass frames use one of the best thermal performing materials available, especially compared to vinyl that often is reinforced with aluminum or steel.