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Sash window double glazing

Slimline double glazing for period sash windows

Contact us Slimline double glazing for period sash windows
U-ValueOutside °CRoom °CInternal Pane °C
Single Glazing5.8-5°C20°C1°C
FINEO vacuum double glazing0.7-5°C20°C17.7°C

Practical example of FINEO efficiency

practical example of FINEO efficiency

Made in EU

Unlike other Vacuum double glazing products on the market, which are produced in China and Japan, FINEO glass is produced in Belgium.


The lead time from production to delivery is approximately 4-6 weeks.

Vacuum double glazing can extend the maintenance cycle of wooden window frames

Vacuum double glazing significantly reduces condensation from the inside of the window frame. This reduces the damp problem as well as deterioration of the wooden frame.

Vacuum FINEO double glazing compared to other glazing options

FINEO is approved by the European Organisation for Technical Assessment (EOTA)


Advantages of double glazing and sash window restoration

  • Improved thermal and acoustic insulation,
  • Reduction of noise and condensation,
  • Reduction of sash window draughts,
  • Significant savings in heating costs,
  • Water and air sealing,
  • Thermal and acoustic properties comparable to new double glazed sash windows,
  • Does not alter the existing architectural features,
  • Interior and exterior aesthetics are preserved.
reduce-noise pollution for better sleep
sash window heat lost
stop uv radiation window glazing


What does double glazing U-value means?

U-Value of double glazing indicates the transition of the heat through the glass. Low the number, less heat is being transferred through the double glazing. 

Can I install vacuum double glazing in Grade 2 listed property?

Yes, you can retrofit vacuum double glazing into the window in the Grade 2 listed property, but permission from the local conservation officer is required. 

Can vacuum double glazing be also tempered?

Yes, there are few manufacturers on the market which produce tempered vacuum double glazing. 

What is the thinnest double glazing?

The thinnest double glazing is 6mm vacuum-insulated glass. This double glazing is perfect for old wooden window retrofitting.