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Why Composite is Better Than Fiberglass

Writer's picture: Eastern Window SupplyEastern Window Supply

Updated: Mar 23, 2021

The beauty of real wood. The advantage of composite. Here's a few advantages of fiberglass:

  • 78% better thermal value!

  • Easier and more cost-efficient fabrication and installation; diamond tipped blades are not required.

  • Mortise & tenon sash joinery for better looking corners.

  • Weldable, so no caulking required; results in less installation liability.

  • Pre-finished SuperCap; does not require painting.

  • 100% recyclable.

  • Bends easy into radius shapes.

  • SuperCapSR with durability, superior to paint.


Superior Thermal Performance

CompositWood's solid core offers better thermal mass performance than any other window frame material. CompositWood is revolutionary material with optional real wood laminate that offers the weather-resistant, no-maintenance advantages of a composite.


The solid-core material is a blend of thermoplastic alloy resins that includes both PVC and acrylic-based polymers. This unique resin combination can't absorb moisture, so it provides a very stable material that's ideal in cold, high-heat and high-humidity climates.


Superior to Wood

CompositWood offers wood's beauty with these advantages:

  • 63% better thermal value.

  • Impervious to moisture and humidity.

  • Rot-proof.

  • Impervious to insects.

  • Doesn't support fungal growth.

  • Dent-resistant.

  • Integral, durable SuperCapSR white exterior with superior durability to paint.

  • Standard vinyl SuperCap available in white and white/pine.

  • Superior screw retention.

  • Lifetime warranty.


Supercap Exterior Color Technology

Innovative patent-pending SuperCapSR is drawing upon military infrared heat-reflective technology. It reflects 76% of infrared light to reduce solar heat-gain and prevent heat-related profile distortion.


Superior Screw Retention

CompositWood with SuperCap provides superior screw retention (ASTM D1037)


Superior Hardness

The integral, fused color layer is 12x harder than competitive paints.


Resists Water Absorption and Swelling

Testing shows that CompositWood absorbs 44x less water than wood, and 40% less than a leading wood composite (ASTM D570 methodology, materials submerged for a three-week period).


Water Absorption

(Frame Material / Absorption % Mass)

CompositWood 2.1%

PVC Composites 2.4%

Wood (Pine) 93.2%

Wood Composite 3.5%


Superior Dent Resistance

CompositWood with SuperCap surface technology offers superior impact strength and dent resistance.


Styles & Configurations

All windows and door products are available with new construction frame depths (4-9/16"). Double Hung, Picture & Casement/Awnings are available in 3-1/4" depth pocket frames for replacement applications. System Styles include:

  • Casement & Awning Windows.

  • Tilt Double Hung Windows.

  • Direct Set Picture Windows.

  • Flanker & Transom Picture Windows to match Casement & Double Hung frames.

  • Horizontal Slider Windows.

  • Bay & Bow Windows.

  • Multi-Panel Glider & Swing Patio Doors.

  • Architectural Shapes


Real Wood Interior Veneers

CompositWood profiles are available in a real wood veneer to provide the beauty of wood with all the advantages of a composite.

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