Slim Double Glazing

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Slim Double Glazing Guide:

 

Slim double glazing is a popular option for heritage and period properties in the UK, offering improved thermal and acoustic performance while maintaining a traditional appearance. Here are some key details about slimline double glazing in the UK:

Materials

Slim double glazed units typically consist of:

  • Two panes of glass, usually 4mm thick each
  • A narrow cavity between the panes, ranging from 4-6.5mm
  • Low-emissivity (Low-E) glass on one pane to improve thermal performance
  • Inert gas fill (usually argon or krypton) in the cavity
  • Warm edge spacer bar around the perimeter

Dimensions

  • Overall unit thickness: 11-14mm
  • Typical sightline (visible edge): 5-8mm

Performance

  • U-values ranging from 1.5-1.9 W/m²K, compared to ~5.6 W/m²K for single glazing
  • Improved sound insulation compared to single glazing

Colours and Finishes

  • Clear glass is standard
  • Tinted, patterned, or obscure glass options available
  • Reproduction “crown” glass to mimic historic appearance
  • Spacer bars can be colour-matched to window frames

Costs

  • Approximately £600-£800 to install in an average 6-over-6 sash window
  • Generally more expensive than standard double glazing due to specialised manufacturing

Applications

  • Suitable for retrofitting into existing timber window frames
  • Often used in listed buildings and conservation areas (subject to approval)
  • Can be fitted into most single glazing rebates and narrow glazing bars

Considerations

  • May require planning permission for listed buildings
  • Some conservation officers prefer 5mm sightlines for a more authentic appearance
  • Durability concerns with very narrow (3mm) spacer bars and reduced sealant depth

Slimline double glazing offers a compromise between modern performance and traditional aesthetics, making it a popular choice for upgrading windows in period properties across the UK.

 

slim double glazing

 

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