Fiberglass Window
A window with frames made from pultruded fiberglass (glass-reinforced polyester), offering superior strength, thermal performance, and longevity compared to vinyl.
Fiberglass windows are increasingly popular in Canada for their combination of strength, energy efficiency, and durability. The fiberglass frame has a similar coefficient of thermal expansion to glass, reducing seal stress and extending IGU life. Fiberglass frames can be painted and are significantly stronger than vinyl, allowing for narrower sightlines.
Leading Canadian fiberglass window manufacturers include Fibertec, Inline Fiberglass, and Ostaco. Major brands like Marvin (Ultrex) and Pella (fiberglass line) also offer fiberglass options. Cost is typically 15-30% more than premium vinyl.