The Role of Window Spacers

The Role of Window Spacers

September 23, 2016

The energy efficiency of replacement windows in Milwaukee is reliant on the parts that add to their insulating properties, such as spacers. They are metallic components that hold lites of glass apart at the right distance. Today, the use of metal spacers and sealants are considered the standard solution for insulating glass units. These spacers are typically made of aluminum and include a desiccant that can absorb residual moisture.

Window Spacers

Renewal by Andersen® of Milwaukee elaborates more on the role of window spacers.

Their Primary Function

Aside from keeping glass lites separated, window spacers accommodate stress caused by thermal expansion and pressure differences. They also serve as a moisture barrier to prevent water leakage and condensation. Lastly, they prevent the loss of special low-conductance gas.


There are two generic systems used in insulating glass units: a single-seal spacer and a double-seal system.

  • Single-Seal – An organic sealant, such as butyl, is applied behind the spacer and holds the unit together to prevent moisture intrusion. They are, however, not adequate to contain special low-conductance gases.
  • Double-Seal – A primary sealant seals the spacer to the glass to prevent gas loss and moisture, while a secondary sealant, usually in the form of silicone, provides structural strength. When stammered low-E coatings are used with double-seal systems, it becomes essential to remove the coating from the edge first for a better seal.

Our Replacement Windows

At Renewal by Andersen of Milwaukee, we offer replacement windows that feature warm edge spacers. For instance, our specialty windows in Milwaukee, WI, feature low-conductivity spacers made of stainless steel. It has a strong resistance against heat unlike other materials. This stabilizes the glass while providing insulation throughout the whole window.

Apart from this insulating component, our windows also come with High-Performance™ Low-E4® glass that can lessen heat that builds up in your home. They also feature our Fibrex® frame composite that offers superior insulation for a cozier home. Couple this with our airtight and seamless installation and you have the assurance of a highly energy-efficient window.

You can be sure that the components of every casement window in Milwaukee from Renewal by Andersen will lead to a livable home. Call us today at (877) 977-3639 to learn more about our windows.

Hear From Our Customers

Jason and Brett did an awesome job installing our doors. We had separate installers a month earlier for our windows who also did a fantastic job. They were all very professional and cleaned up almost better than the area looked before the installation! Since these were both jobs that took more than one day the installers were great at keeping us informed on the status of where the project was at along the way.

This was a great crew to work with. Both the original install manager we worked with (Jay) and the install team (Daniel, Mason, Tony, Ethan, and Jose). Everyone was very professional and knowledgable. They answered all my questions and the end result on the house is great. In 3 days they replaced an old bay window with a new bay window, a set of french doors on the patio with a sliding patio door, and our old front door with a new front door and storm door.

I cant express how happy we are with choosing Andersen for our window installation. Our sales representative was knowledgeable with product and answered any questions we had without hesitation. I did also fill out a survey that was sent in an email, but sadly I failed to personally name the two gentlemen that performed the actual installation. Barrett and Francisco were our guys, and let me tell you, they were outstanding!!! They did Excellent work and were professional as well as efficient and made this a smooth, none evasive process for us. I strongly recommend this company and these installers to anyone in need of windows!!! My husband and I could not be more pleased we chose Andersen for replacing our windows!!!

20% off entire project + $100/each window
Claim These Savings
Custom Built In USA
Lead Safe

Since its founding in 1977, the Alliance to Save Energy has been a leader in energy efficiency policy and advocacy. Over the years, the Alliance’s programs and priorities have evolved as U.S. energy efficiency policy has grown.