Calculate the U-value of the proposed wall construction for a new house. The proposed construction from outside to inside is 102.5 mm bricks, 75 mm mineral wool, 140 mm mediumweight concrete blockwork, and 12.5 mm plasterboard. The conductivities for these four materials can be taken to be 0.84, 0.04, 0.80, and 0.16 W/m.K respectively. Assume inner and outer surface resistances of 0.13 and 0.04 m2 .K/W. Thermal bridging can be ignored for the purposes of this calculation.