CompositWood material combines the beauty of wood with superior, rot-proof durability and no-maintenance attributes of vinyl.

CompositWood, the next generation of windows, is a revolutionary material blended with timeless design that surpasses the ambitions of even the most well known window manufacturers.

What is CompositWood?

CompositWood is made from a proprietary mix of specialty polymer and acrylic resins, creating an “engineered composite”, super tough, solid core material. A permanent color surface technology called “SuperCap™” is fused to the core materials during the extrusion process.

CompositWood is simply the best window you can buy. It provides the warmth of a finely milled wood window without the problems associated with wood.

Why CompositWood?

Nothing defines a home like the elegance and warmth of wood windows, but the maintenance problems and expenses associated with wood are simply overwhelming.

Metal and vinyl clad wood windows were only partial solutions. In the industry-wide pursuit of window excellence, CompositWood is the answer.

  • Classic wood window designed frame and sash for added curb appeal
  • Solid core frame and sash for superior thermal performance
  • True sloped sill for fast water run-off and easy cleaning
  • Draftblocker™ off-set compression sash design for air-tight seal and added security.
  • Light Lift™ SP (Superior Performance) balances for easy operation
  • Integral off-set balance pockets and multiple weather-strip paths to reduce air infiltration
  • Tripled-secured sash & frame corners: mortise & tenon joined chemically or fusion-welded frame and sash, stainless-steel screw fastened
  • Tilt in sashes for easy cleaning from inside your home
Exclusive Light Lift™ SP (Superior Performance) Sash Balance System on all CompositWood Double Hung Windows

Constant Force, Constant Clean, T-Lock Balance
CompositWood double-hung windows are built exclusively with the Light-Lift SP (Superior Performance) Balance System. Light-Lift SP insures consistent, easy-to-manage tension whether opening or closing. It has built in dust plugs which help keep coils free of dust and debris and also act as weatherstripping, for additional energy efficiency.


Color Choices — Inside and Out:

Inside, select solid SuperCap® white or CompositWood’s real Eastern pine veneer that can be stained or painted to suit your needs. Outside, choose from SuperCap white (white interior); 14 in-stock factory painted colors; over 30 special order colors; and virtually unlimited custom matched colors (15-year paint warranty).

Custom Paint Finishes (14 in Stock Exterior Colors)
Custom Paint Finishes

Unlimited Color Match Exterior Colors. Custom blended colors available to suit your design needs – limited only by your imagination!


Incredible Thermal Values

Dual Energy Saver
  • Double Pane with Duralite™ Spacer and ClimaGuard Low E glass and Argon gas in the chamber
  • U-factor:
    • .25 – Double Hung
    • .23 – Casement, Awning
    • .21 – Double Hung w/additional Low E on interior surface
    • .20 – Double Hung w/additional Low E on interior surface & special certified gas fill* (IS-20 glass)
    • .20 – Casement, Awning w/additional Low E on interior surface *
Triple Fuel Saver™
  • Triple Pane with Duralite™ Spacer and 1” insulated assembly with 2 panes of Climaguard Low E glass and Argon gas in both chambers
  • U-factor:
    • .19 – Double Hung *
    • .16 – Casement, Awning *
Triple Fuel Saver Plus™
  • Triple Pane with Duralite™ Spacer and 1” insulated assembly with 2 panes of Climaguard Low E glass, Krypton gas and Argon gas.
  • U-factor:
    • .17 – Double Hung *
    • .15 – Casement/Awning *
Triple Fuel Saver Max
  • Triple Pane with Duralite™ Spacer and 1” insulated assembly with 2 panes of Climaguard Low E glass and Krypton gas
  • U-factor:
    • .16 – Double Hung *
    • .14 – Casement/Awning *

* Products that are recognized as the Most Efficient of ENERGY STAR in 2023 meet rigorous energy efficiency performance levels set by the U.S. Environmental Protection Agency. CompositWood has been awarded the ENERGY STAR Most Efficient mark for 2023.

Climaguard™ Low E Glass and Argon Gas Add Comfort and Energy Savings

Low E is a transparent metallic oxide coating applied onto a glass surface. The coating allows short-wave energy to pass through but reflects long-wave infrared energy, which lowers the U-value and that means more energy savings. An odorless, colorless, tasteless, non-toxic gas, argon is six times denser than air. It is used to replace air between the glass panes to reduce thermal energy transfer and heat loss.

ClimaGuard glass has heat reflective coatings – microscopically thin layers of metal and metal oxide that filter energy by keeping warmth inside in winter and outside in summer.

Built Tough Hardware

All Interstate vinyl windows come standard with the industry’s finest hardware system. The operators, locks, and hinges have all been developed to work together to meet or exceed maximum performance requirements. Interstate provides the strongest, most attractive, easiest operating and highest performing hardware in today’s market.

Double Hung Applied Handle
Compositwood Grid Options

Grids bring a distinctive look to your home. Four grid styles in a variety of color and style combinations offer many choices when selecting grids for your windows. Grids Between Glass (GBG) afford easy cleaning, Simulated Divided Lites (SDLs) are permanently adhered to the panes inside and out and are designed to look like a true multi-paned window.

CompositWood Grid Color Options

– Flat Colonial
• White
• Adobe
• Bronze Exterior/White Interior
• Custom Painted

– Contoured Colonial
• White
• Adobe
• Bronze Exterior/White Interior

– SDLs (Simulated Divided Lites)
• White (exterior & interior)
• Bronze exterior/White interior
• White exterior/Pine Interior
• Removable Grids with Frame Surround, interior mounted
• Custom Painted


* Only Flat and exterior Simulated Divided Lites can be custom painted.

Sample Grid Patterns