Table of U-Values for our Double Glazed Units

The following table gives centre pane U-Values for the constructions and cavities of our Double Glazed Units as shown.

Glass 1 (4mm) Glass 2 (4mm) Cavity Fill Cavity Width (mm)
6 8 10 12 14 16 18 20
Clear Clear Air 3.3 3.1 3 2.9 2.8 2.7 2.7 2.8
Clear Clear Argon 3.1 2.9 2.8 2.7 2.6 2.6 2.6 2.6
Clear Clear Krypton 2.8 2.7 2.6 2.6 2.6 2.6 2.6 2.6
Clear Hardcoat E Air 2.7 2.3 2.1 2.2 1.8 1.7 1.6 1.6
Clear Hardcoat E Argon 2.3 2.2 2.0 1.9 1.7 1.6 1.5 1.4
Clear Hardcoat E Krypton 1.8 1.6 1.6 1.7 1.6 1.5 1.4 1.3
Clear Softcoat E Air 2.5 2.1 1.8 1.6 1.5 1.4 1.3 1.2
Clear Softcoat E Argon 2.0 1.7 1.6 1.4 1.3 1.1 1.1 1.1
Clear Softcoat E Krypton 1.7 1.4 1.4 1.3 1.2 1.0 1.0 1.0
Double Glazed Unit (DGU) thickness 14 16 18 20 22 24 26 28

Notes

These figures are based on Glass Units of 4mm x 2, plus CW (Cavity Width) & CF (Cavity Fill) to give DGU (Double Glazed Unit) thickness to get a U-Value.

Therefore Glass 1 + CW & CF + Glass 2 = DGU gives U-Value

Examples:

1: Glass 1 (4mm) + CW 20mm & CF (Air) + Glass 2 (4mm) = 28mm gives 2.8

2: Glass 1 (4mm) + CW 20mm & CF (Argon) + Glass 2 (4mm) Softcoat E = 28mm gives 1.1

  • U-Values are quoted in W/m2/K, rounded down to the nearest 0.1
  • Argon and Krypton figures are based on a standard 90% fill.
  • Gas fill rates are accurately measured can be enhanced where required.

Key

 
< 1.1
1.2 – 1.5
1.6 – 1.9
2.0 – 2.5
> 2.6
Specialist class leading applications
Comfortably exceeds Doc L in most frames
Document L compliant range
Low level thermal insulation
Standard double glazing

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Technical Information - However you use glass it is essential for safety and performance reasons that it is correctly specified and installed. Common areas of impact risk, where it is recommended that impact safety glass to BS 6206 is installed, include: Glazed doors, Glazing adjacent to doors, Low level glazing, Bathroom areas, Protective barriers, Furniture and cabinets.

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