In both residential and commercial buildings, improving energy efficiency remains a key priority, particularly as energy costs fluctuate and environmental regulations tighten. One such way of improving energy performance is through the windows, and by improving thermal insulation for glazing. Warm edge spacers play an important role in accomplishing this, helping to reduce heat loss and lowering energy bills.

Warm edge spacers

While traditional spacers have long been part of window systems, modern warm edge spacers, such as Edgetech’s Super Spacer® contribute to superior thermal insulation, better comfort, and greater performance in modern windows.

Warm edge spacers are the non-metallic components used to separate the glass panes in double glazed or triple glazed insulated glass units (IGUs), forming an insulating cavity typically filled with inert gases such as argon or krypton. This configuration significantly reduces heat transfer between the inner and outer panes, improving the window’s overall thermal insulation.

Unlike traditional aluminium spacers, which have high thermal conductivity, warm edge spacers are made from low-conductivity materials like plastic composites such as polypropylene, silicone foam and multilayer polymer vapour barriers. These materials:

Reduce the amount of heat that transfers between the inside and outside of a building
Minimise cold bridges around the glass surface
Improve the window’s overall thermal rating
Help retain insulating gas (like argon or krypton) within the cavity between sheets of glass

Thanks to much lower conductivity than aluminium, warm edge spacers dramatically limit heat flow at the weakest point in a window: the edge of the glass.

Three men in safety vests at an Edgetech factory, reviewing plans while surrounded by machinery and safety signage.

How do warm edge spacers help reduce energy loss in glazing?

Each pane of glass in a window interacts with either external or internal temperatures, so the space between is insulated with a high percentage of Argon or Krypton Inert Gas. But it’s the edges, where the glass sheets meet the frame materials, that can be a big differentiator of heat transfer. Warm edge spacers improve performance by:

Creating an insulating barrier between the glass panes
Supporting stable temperature control across the entire glass surface
Retaining inert gases that provide thermal insulation within the glazing unit
Helping to prevent solar heat gain in summer and heat loss in winter

Why is thermal insulation for glazing so important?

In buildings with poor insulation, up to 30% of heat loss can occur through windows. Edge-of-glass areas are especially problematic due to their exposure to external conditions. This leads to increased energy bills, discomfort from temperature changes and a higher risk of condensation and potential damage to window seals and frames Improving thermal insulation performance with warm edge solutions like Super Spacer® directly addresses these issues.

The science behind thermal breaks and warm edge technology

Thermal breaks prevent direct heat flow through window components. Traditional aluminium spacers create a thermal bridge, allowing much heat to escape, whereas warm edge spacers act as a thermal break between the panes of glass, limiting this effect.

Edgetech’s Super Spacer® incorporates advanced foam and sealant technologies that maintain gas fill integrity, resist UV and moisture. It also offers excellent structural durability, making it ideal for high performance windows in both residential and commercial buildings.

What role do warm edge spacers play in temperature regulation?

Keeping a consistent indoor temperature all year-round requires limiting unwanted solar gain in summer and retaining warmth in colder climates. Warm edge spacers:

Reduce solar heat gain through the edge of the window
Limit winter heat loss, particularly in cold climates
Maintain a more stable glass temperature, reducing condensation that could be formed on cold spots hence preventing moisture build-up
Support greater comfort by reducing hot and cold spots near windows
Provide a healthier indoor environment and better long-term performance

Key performance benefits of warm edge spacers

Warm edge technology delivers value in several measurable ways.

1. Energy efficiency

Warm edge spacers reduce energy loss at the window edges, improves whole-window U-values and lowers energy consumption and the carbon footprint of buildings.

2. Better insulation

Warm edge spacers are more effective at trapping natural heat inside during winter and limit solar heat entry during warmer months.

3. Comfort

Warm edge spacers minimise temperature changes across windows and support more stable indoor climates.

4. Sustainability

Warm edge spacers support sustainable building practices, lowering lifetime energy consumption, reducing material waste thanks to a longer lifespan, and support compliance with building regulations.

Warm edge spacers are suitable for all climate zones and perform well in domestic homes that prioritise thermal comfort and lower energy bills, commercial buildings with demanding energy performance requirements, and passive and low-energy building designs focused on high performance.

The Super Spacer® range

Edgetech’s Super Spacer® ranges support:

Residential window systems with efficient windows for reduced energy loss
Commercial glazing systems with advanced performance standards
Complex architectural shapes due to its flexibility and structural strength

Super Spacer® TriSeal™, for example, features a triple-seal system specifically developed for high-spec commercial buildings, ensuring long-term stability and better thermal insulation.

Forel Insulating Glass Production Line at Twinseal IGU Manufacturing Factory

How do Super Spacer® products outperform conventional edge spacers?

Edgetech’s Super Spacer® series leads the market in thermal performance.

Low thermal conductivity for maximum energy efficiency
Long-term gas retention thanks to strong adhesive seals
Built-in desiccant for moisture resistance
Durability tested in demanding climates and conditions
Ideal for automation, reducing manufacturing time and waste

Contact Edgetech today for tailored warm edge solutions

If you’re looking to improve the thermal performance of your glazing, Edgetech has the solution. Our range of Super Spacer® products is designed to meet the specific needs of manufacturers, architects, and installers seeking energy efficient windows that perform across the board. Contact our team today.

FAQs

Q: Can warm edge spacers be used with any window frame material?

A: Yes. Whether the frame is timber, PVC-U, or aluminium, warm edge spacers integrate effectively and improve thermal performance.

Q: Do warm edge spacers work with all types of glazing?

A: Yes. Whether you’re using double glazing, triple glazing, or specific types of glazing tailored to certain performance needs, warm edge technology is compatible across the board.