blog-banner

Are you looking for a contractor?

Submit our quick form and get quotes now!

Everything to Know About Window Spacers

By Cynthia Pigeon

Updated on November 7, 2023

Did you know that windows and glass doors are majorly responsible for heat loss in homes? Therefore, energy efficiency is a determining factor when it comes to changing your windows to maximize energy savings.

Shopping for windows can be overwhelming, especially if you have limited knowledge regarding insulation and energy efficiency. In Quebec, the winters are harsh, therefore aesthetics should definitely not be the sole consideration when buying new windows. Consequently, sturdiness, airtightness, glass quality, energy efficiency (EE), and acoustic properties should all be taken into account.

The various structural components of a double-glazed window include glass, compression seals, sash, frame, and spacer, which are essential components for thermal windows. Learn more about the window spacer!

window spacer_Everything to Know About Window Spacers_Reno Quotes

Photo: Pixabay

What Is a Window Spacer?

A spacer is a feature that separates the individual panes of glass, whether in a double or triple-glazed window (in the latter case, there will be two spacers). This rigid part of the window comes in various materials such as steel, plastic, stainless steel, or aluminum, and is usually supplemented with an insulator. The spacer creates a gap between the windows, which is either filled with air or argon gas. In most cases, the latter option is retained as argon is actually less conductive than air, which limits heat loss.

The spacer and its insulator are crucial to the durability of your window, as these elements maintain the air or argon gas between the windows, thus preventing condensation and maintaining the window's thermal efficiency. Note that the glass and the spacer form a unit that is hermetically sealed against moisture and air.

The desiccant coated on the inside of the liner serves as a barrier against humidity. A desiccant is actually a moisture absorber, which is frequently added to packages to prevent moisture from damaging the contents. Its composition can vary, but it is most often in the form of silica gel or a similar substance. 

Overview: Purpose of a Window Spacer

  • Improve window thermal resistance (R-value) through low conductivity;

  • Retain gas in the sealed unit to maintain the same performance over time;

  • Prevent moisture from entering the sealed unit.

window_Everything to Know About Window Spacers_Reno Quotes

Photo: Deposit Photo

Window Spacer: Most Efficient Material

Spacers are made from a variety of materials including steel, aluminum, stainless steel, and plastic. The material you select is paramount to ensure that you get the best performance possible from your spacer. Although the majority of spacers are often made of aluminum, your best bet is plastic.

Unlike aluminum, plastic is much less conductive and less likely to create a thermal bridge between the interior and exterior of the glass panes. A thermal bridge is the main cause of condensation around the window, which must be avoided at all costs. Note that with plastic, you lose 20% to 30% less heat.

Warm Edge Spacer

Another available option is the warm edge technology. Designed for thermoplastic glazing with double or triple layers of glass, the warm-edge spacer acts as a protection against thermal bridges.

The warm edge spacer is made of a synthetic membrane and a combination of plastic and fibreglass. Its surface is covered with a thin layer of stainless steel sheet. Note that this type of spacer traps heat inside the glass, which gives it an excellent energy-efficient performance.

window_Everything to Know About Window Spacers_Reno Quotes

Photo: Deposit Photo

Tips for Choosing Thermal Windows

The ER rating and Energy Star® certification are two essential references that will allow you to make an informed decision about your new thermal windows. With good reason, these two indicators account for all of the product’s attributes, rather than just one or more of its components.

Energy Efficiency Criteria (ER)

The ER rating measures the overall efficiency of a window. The rating takes into account the window’s ability to generate heat from solar energy during the winter and its potential to prevent heat loss through its various components. The numerous performance factors establish the performance rating of a window on a scale of 0 to 50. The higher the ER rating, the higher the energy efficiency of the product.

Energy Star® Certification

Everyone has heard of the trusted Energy Star® certification label for appliances. Yet few people know that this label also applies to windows and doors. Choosing Energy Star®-approved windows offers the possibility of reducing heating costs by up to 10%.

Interestingly enough, some small-sized manufacturers may not be able to qualify for Energy Star® certification since this label is typically reserved for larger brands. However, this does not mean that a tradesman cannot build windows with excellent thermal insulation. So, check with your local tradesmen, you might be surprised!

Looking for more information about doors and windows? Check out our Door and Window Renovation Guide.

Cover Photo: Pexels

Get 3 renovation quotes for your door and windows project

RenoQuotes.com can help you get quotes for your door and windows project. By submitting your project, we’ll put you in contact with top-rated contractors. Fill in the form on the homepage (it only takes a few minutes), and you will get estimates from trusted professionals.

Dial 1-844 828-1588 to speak with one of our customer service representatives.


Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Looking for something else?

Table of contents

4 min read

Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Are you a contractor?

Join our network and receive real leads!

Download the price guide for renovations

We’ll be emailing you the latest market price guide for renovations.



Related articles

The latest industry news, interviews, technologies, and resources.

7 min read

Editorial Team

21 Mar 2024

How to Install a Bay Window Step-by-Step

Windows rank amongst the fundamental architectural features of a house, allowing daylight to filter in. With that in mind, bay or bow windows are a sure asset in all homes. 

5 min read

Editorial Team

07 Nov 2023

10 Interior Sliding Door Models

Sliding doors are no longer only used in commercial environments! They have practical and aesthetic qualities that can be integrated into a residential layout. They are especially useful in small homes, where every inch counts, but they are also used in large homes to create spaces that can be opened or partitioned as needed.

3 min read

Editorial Team

07 Nov 2023

How to Create An Opening in a Load Bearing Wall

Of course, the steps described above are very basic and do not describe the process in detail. Some techniques are also very different from what is described. In the end, you must absolutely call in a specialist. 

Interior renovations
4 min read

Équipe éditoriale

07 Nov 2023

10 of the most beautiful bedrooms seen in TV and film

As we’re well into the new year, it’s likely that you're ready to take on the projects that have been put on the backburner. For many, the bedroom is one of the most personal spaces, and it’s important that the decor reflects comfort and tranquillity. After giving much thought, this project is likely a top priority.

6 min read

Editorial Team

17 Dec 2024

10 examples of small rooms with smart layouts

A lack of space can be seen as an obstacle when thinking about the layout of our home. Of course, that doesn’t mean that it will necessarily be more complicated. Instead, it's all a matter of perception.

Renovation tips

Looking for a contractor?

Submit a project and get 3 free quotes now!