U values for windows
Formula for calculating the total U value of a window, taking into account the glazing unit, the share of profiles and an edge zone effect linear factor.
Uwindow = ( Ag * Ug + Af * Uf + Ig * ψg ) / ( Ag + Af )
The links below present tables with the total U value of a window for different glazing units and spacer bar. The calculations should be based on applicable standards and requirements.
U-value double glazing with alu. spacer bar
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Window
1230 × 1480 mm
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U-value of glass Ug W/m2K (middle point)
Aluminium spacer bar
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Ug
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1,0
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1,1
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1,2
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1,3
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1,4
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1,5
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1,6
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Fixed window
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1,4 |
1,5 |
1,6 |
1,6 |
1,7 |
1,8 |
1,9 |
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Opening window
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1,7 |
1,7 |
1,8 |
1,9 |
1,9 |
2.0 |
2,1 |
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For more information please contact our Architect Support
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U-value double glazing with warm edge spacer bar
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Window
1230 × 1480 mm
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U-value of glass Ug W/m2K (middle point)
Warm edged spacer bar
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Ug
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1,0
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1,1
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1,2
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1,3
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1,4
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1,5
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1,6
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Fixed window
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1,3 |
1,4 |
1,5 |
1,6 |
1,6 |
1,7 |
1,8 |
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Opening window
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1,6 |
1,7 |
1,7 |
1,8 |
1,9 |
1,9 |
2,0 |
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For more information please contact our Architect Support
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U-value triple glazing with alu. spacer bar
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Window
1230 × 1480 mm
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U-value of glass Ug W/m2K (middle point)
Aluminium spacer bar
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Ug
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0,4
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0,5
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0,6
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0,7
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0,8
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0,9
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1,0
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Fixed window
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0,9 |
1,0 |
1,0 |
1,1 |
1,2 |
1,3 |
1,4 |
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Opening window
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1,2 |
1,3 |
1,4 |
1,4 |
1,5 |
1,6 |
1,7 |
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For more information please contact Architect Support
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U-value triple glazing with warm edge spacer bar
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Window
1230 × 1480 mm
|
U-value of glass Ug W/m2K (middle point)
Warm edge spacer bar
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| |
Ug
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0,4
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0,5
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0,6
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0,7
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0,8
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0,9
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1,0
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Fixed window
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0,77 |
0,86 |
0,94 |
1,0 |
1,1 |
1,2 |
1,3 |
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Opening window
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1,1 |
1,2 |
1,3 |
1,4 |
1,4 |
1,5 |
1,6 |
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For more information please contact our Architect Support
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