Calculating the U-value of a cavity masonry wall construction

thickness: mm conductivity: W/m?K
thickness: mm conductivity: W/m?K
thickness: mm conductivity: W/m?K
residual cavity (if any): mm resistance of residual cavity: m2K/W
cavity insulation thickness: mm ? insul. conductivity: W/m?K
thickness: mm conductivity: W/m?K
thickness: mm resistance: m2K/W

U-value of wall is W/m2K (including corrections for air gaps and wall ties);
Thickness of wall is mm

Adjustment for air gaps is W/m2K;
Adjustment for wall ties is W/m2K;
Κ- value of wall is kJ/m2K (thermal mass)

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