U values for 1074 inward opening French window
Formula for calculating the total U value of a French window, taking into account the glazing unit, the share of profiles and an edge zone effect linear factor.
UFrench window = ( Ag * Ug + Af * Uf + Ig * ψg ) / ( Ag + Af )
The links below present tables with the total U value of a French window for different glazing units and distance strips. The calculations should be based on applicable standards and requirements.
U value for a French window with a double glazing unit and an aluminium distance strip
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Share of profiles |
U value of glass Ug W/m2K (middle point)
Aluminium distance strip |
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1,0 |
1,1 |
1,2 |
1,3 |
1,4 |
1,5 |
1,6 |
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20 % |
1,4 |
1,5 |
1,6 |
1,7 |
1,8 |
1,8 |
1,9 |
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25 % |
1,5 |
1,6 |
1,7 |
1,8 |
1,8 |
1,9 |
2,0 |
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30 % |
1,6 |
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 for a French window with a double glazing unit and a warm edge distance strip
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Share of profiles |
U value of glass Ug W/m2K (middle point)
Warm edge distance strip |
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1,0 |
1,1 |
1,2 |
1,3 |
1,4 |
1,5 |
1,6 |
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20 % |
1,4 |
1,5 |
1,6 |
1,6 |
1,7 |
1,8 |
1,9 |
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25 % |
1,5 |
1,6 |
1,6 |
1,7 |
1,8 |
1,9 |
1,9 |
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30 % |
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 for a French window with a triple glazing unit and an aluminium distance strip
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Share of profiles |
U value of glass Ug W/m2K (middle point)
Aluminium distance strip |
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0,4 |
0,5 |
0,6 |
0,7 |
0,8 |
0,9 |
1,0 |
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20 % |
1,0 |
1,0 |
1,1 |
1,2 |
1,3 |
1,4 |
1,4 |
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25 % |
1,1 |
1,2 |
1,2 |
1,3 |
1,4 |
1,5 |
1,5 |
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30 % |
1,2 |
1,3 |
1,4 |
1,4 |
1,5 |
1,6 |
1,6 |
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For more information please contact our Architect Support
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U value for a French window with a triple glazing unit and a warm edge distance strip
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Share of profiles |
U value of glass Ug W/m2K (middle point)
Warm edge distance strip |
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0,4 |
0,5 |
0,6 |
0,7 |
0,8 |
0,9 |
1,0 |
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20 % |
0,9 |
1,0 |
1,1 |
1,2 |
1,2 |
1,3 |
1,4 |
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25 % |
1,0 |
1,1 |
1,2 |
1,2 |
1,3 |
1,4 |
1,5 |
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30 % |
1,1 |
1,2 |
1,3 |
1,3 |
1,4 |
1,5 |
1,5 |
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For more information please contact our Architect Support
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