Get A Free Quote

Fibrex®: Preventing Warping Issues in Windows

Warping is a serious problem that often occurs with standard wood and vinyl window frames. It can dramatically affect energy efficiency and diminish the curb appeal of your home if left untreated for too long. 


In this article, Renewal by Andersen® of Montana, a leading provider of top-rated window replacement discusses everything you need to know about warped windows, including what causes them and how to fix them.

What Causes Warped Windows?

Changes in the temperature and moisture of the outside world cause warping. While wood’s size varies naturally, the wood fibers expand and contract unevenly, which can lead to warping. Moisture that a board absorbs creates swelling, which in some cases does not return, leading to warping. 

This is why wood windows need to be painted or waterproofed on a regular basis. On the other hand, vinyl windows are particularly prone to high temperatures, which causes warping.

Why Fibrex®?

Fibrex is a warp-resistant window material that can be used in place of wood or vinyl. Fibrex blends the strength and insulation of wood with the low-maintenance benefits of vinyl. It is more resistant to warping than other window materials. Here’s why:

  • Fibrex is created from recovered wood fibers and polymers, thus it lacks the same flaws as wood. Our windows including sliding windows are less vulnerable to mold and rot–factors that contribute to warping–because this material does not absorb and hold moisture.
  • When exposed to drastic fluctuations in weather and temperature, unlike vinyl, this sophisticated composite does not expand or contract as much. Your windows will maintain their shape, ensuring that they are strong and long-lasting. 
  • Fibrex is resistant to cracking, pitting, and corrosion. The material’s hardness enables windows with a stronger, airtight seal, which helps to prevent significant energy loss.

Renewal by Andersen of Montana offers Fibrex picture windows, awning windows, double-hung windows and many more. For all your window needs, please do not hesitate to give us a call at (406) 812-8167 to schedule a free consultation. Alternatively, you can fill out our contact form to request a free quote.     


"I highly recommend Renewal by Andersen. We were treated well and everything went smoothly from start to finish. The company kept in contact with me before, during, and after the installation and let me know what to expect. I'm in love with my new windows! I will be using this company again when we refinish our basement. "

July, 21

View All Reviews