What is Super Spacer?

Standard windows use a highly conductive metal spacer bar to hold the two panes of glass apart, which sucks heat from inside to the outside. Super Spacer introduces no-metal warm edge technology to windows, helping to deliver windows of the highest standards. Super Spacer® is a no-metal, pre-desiccated, structural foam spacer system. Its award winning, patented Thermal Set Spacer (TSS) technology gives the ultimate in high performance spacer systems. Since it was first introduced in 1989, Super Spacer has become the dominant force in thermally efficient spacer systems.

Super Spacer has 100% memory and allows for expansion and contraction, a major cause of fractures in conventional sealed units. In accelerated testing Super Spacer has been shown to last over twice as long as other dual seal systems and five times longer than single seal systems.


Windows using Super Spacer achieve the highest Window Energy Ratings from the British Fenestration Ratings Council, allowing every step of the supply chain to win more business.

Most PVC-U and traditional timber windows include low line glazing beads and gaskets. This creates problems for standard aluminium spacer bars which protrude into the sightline of the window. Super Spacer has a lower sightline (equivalent to only 9.8mm from the edge of the glass) which eradicates the problem.

whatisSuper Spacer also takes on the appearance of the colour of the profile into which it is glazed. For example, if Super Spacer is glazed into white profile the spacer reflects back white. This eliminates the need to stock a wide range of different colours and simplifies ordering and stock control.

We have also passed EN1279 Part 2 and Part 3 – a legal requirement for all sealed unit manufacturers. And we’ve subjected Super Spacer to rigorous testing worldwide to meet our customers’ needs internationally. This means Super Spacer is proven to withstand temperatures from -15°C to 125°C, well beyond any temperatures experienced in the USA.

“All St. Albans Windows are made using the Super Spacer Seal System”
We Have More Than Edged Out the Competition…
We have peaked the performance level of every clear and LOW-E glass unit on the market today.

20% of glass area is affected by cold edge.


  • What causes window condensation to always start near the edge of the glass?
  • What is responsible for the window’s actual insulation performance (measured by the R-value) to be normally 15-20% worse than advertised?

The answer to both questions is the metal spacer that holds the glass panes together. At the edge of an insulating glass unit, the glass is physically connected and stabilized by a metal spacer. However, the metal connection also permits heat loss by conduction, so much that current glass edges can lose energy at a rate 120% greater than the center of the glass.

To improve a window’s insulation capability, “cold edges” can be replaced with less conductive “warm edge” spacers.

Why should we worry about edge of glass insulation?
Warming the glass will:

  1. Condensation is still possible if humidity levels are too high.
  2. Increase overall insulation value of already good windows.
  3. Save more energy through increased insulation.

Simply put, condensation is a function of the thermal efficiency of windows, particularly the edge of the glass. The solution to condensation formation on glass is to increase the thermal efficiency of the edge of glass, the window’s weak link.

Super Spacer Structural Form virtually eliminates condensation. Condensation often causes extensive water damage to window wills and frames, curtains and carpets, and even paint and walls.

When it is cold outside, a metal spacer can drain the energy of your high performance windows. Super Spacer’s patented structural foam design dramatically reduces condensation and delivers the clearest picture in warm edge technology.

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