See The Difference With Integrity Windows and Doors from Marvin

FIBERGLASS Comprised of glass fiber and resin, fiberglass is strong, durable and a good insulator. Low maintenance, superior strength and energy efficiency make fiberglass ideal for many homes. Plus, it’s more environmentally friendly to manufacture than wood or vinyl windows and doors.

Visit our showroom today to touch, feel and explore the wide variety of Fiberglass window and door options available for  superior performance.

Put your trust in Integrity Windows and Doors from Marvin.

Integrity from Marvin is made with Ultrex® pultruded fiberglass, is Built To Perform®. Customers appreciate the Ultrex fiberglass difference:

  • 3x stronger than Fibrex®
  • 8x stronger than vinyl
  • 38% longer useful life expectancy than vinyl
  • Resist fading, chalking, cracking and peeling
  • Meets or exceeds federal ENERGY STAR® guidelines

Visit our showroom or book a sales appointment and see for yourself the strength and durability of Integrity windows and doors made with Ultrex.


Window warranties vary, but a common thread is baseline coverage. Most cover problems caused by defects in material or workmanship. However, some prorate coverage as the window ages. You should also be aware that some “lifetime” warranties often contain tricky qualifiers in the fine print, and are not transferrable if you sell your home. Every Marvin and Integrity window and door is covered by a full 20 years on glass seals and 10 years on manufacturing defects that result in chalk or fade.** Marvin and Integrity warranties are also fully transferable. Ideal if you are replacing windows and doors before you put your house on the market.