Window Outfitters Blog
Why Marvin Integrity Fiberglass Replacement Windows Are Right for Minneapolis Homes

When it’s time to replace the windows in your home here in Minneapolis, you have lots of choices – manufacturers, styles, materials, hardware, and more. We recognize our customers like to have several options to choose from, and that’s one reason we install so many different window brands.  One of our favorites is Integrity from Marvin – an exceptional fiberglass window line.

Why fiberglass for windows and doors?  You’re probably familiar with it as an insulation material and for other purposes.  Makers of boats, aircraft, and even vehicles have been using it for years.  But there are many reasons why fiberglass makes an excellent window or exterior door material:

  • Fiberglass makes a lightweight frame
  • Fiberglass is strong yet durable
  • Fiberglass stands up well in the face of the climate conditions we experience here in the Twin Cities – heat, cold, rain, wind, snow, hail are no match

Integrity from Marvin: Fiberglass Windows with Lasting Color

Marvin introduced fiberglass windows in 1994, with one of their main concerns being a permanent color solution rather than periodic repainting.  You see, when paint is applied to fiberglass, over time the color fades and turns milky.  You may have seen that on older vehicles or boats.

The common paint used was polyester (with a clear gel coat). The finish gel coat did nothing to block or even reduce UV rays that cause color fading and development of a chalky or milky appearance. Even protected polyester paint unfortunately loses about 10% of its pigment each year. Half the color is gone in five years.

Marvin’s solution?  No painted finish. Instead, Marvin has capped off their fiberglass with a thick acrylic cap that has good color retention in addition to being hard and durable.

Why an acrylic cap instead of paint?  It has some great qualities that make it perfect for this application. Consider this: In the 1940s the automobile manufacturers switched from glass to acrylic lenses for exterior lights such as headlights, tail lights, and turn indicators.  To see just what a wise decision this was, just go to a junkyard and see if they’ve got a light from a mid-40s vehicle. If they do, you’ll see it looks almost new (unless it’s damaged).

Yes, other companies manufacture fiberglass windows, but they all paint their frames with polyester, meaning they have to repainted about every five years.

  • Marvin Integrity windows have an acrylic cap that’s between 4 and 7 mils thick; polyester paint finishes are around 1.2 mils thick, and often you can even see the fibers through the paint, as shown in the photo below. You won’t get that with Integrity windows.  This side-by-side comparison makes that obvious!

Marvin’s patented acrylic cap is available in dark colors.  It is resistant to scratching, marring, fading, or developing that chalky look.  The low-maintenance finish can even be repainted with any exterior grade acrylic latex paint, and repainting will NOT void the warranty.

We believe that Marvin’s Integrity fiberglass replacement windows will work for just about every Minneapolis homeowner who wants the very best in a long-lasting window.

Window Outfitters is proud to be designated a Marvin Authorized Replacement Contractor, meaning that you get not only a terrific window when you work with us but you also get installation done according to Marvin’s strict standards as well as great support through the whole process, and even afterward.

We’d love to talk with you about Marvin Integrity fiberglass replacement windows as well as their patio and French doors. Why not call us today for a free in-home consultation?




Window Outfitters is a premier Window Replacement, doors, siding contractor and installer. As Contractor in the St Paul, Minneapolis, (Twin Cities) Minnesota (MN) metro, we proudly serve, but are not limited to, the following areas: Minneapolis Energy Efficient Vinyl Windows, Replacement Window Contractors Minnesota, Burnsville, Apple Valley, Lakeville, Savage, Bloomington, Edina, Richfield, Eagan, St Paul, Hastings, Minnetonka, Plymouth, Maple Grove, Eden Prairie, Farmington MN, Chaska, Shakopee, Chanhassen, Victoria, Mendota Heights Anderson Windows Minneapolis, Marvin Windows Minneapolis.


Window Outfitters Inc. | 12605 Creek View Avenue | Savage , MN 55378 | 952-746-6661

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