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    A cavity wall consists of two 90mm thick walls separated by a 45mm wide cavity that is filled with expanded polystyrene sheeting. Calculate the U value of the wall if
    Thermal conductivity of brick = 1.6w/mk
    thermal conductivity of polystyrene = 0.015 w/mk
    inside surface resistance = 0.123 m2k/w
    outside surface resistance = 0.030 m2k/w
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    (0.123 + 0.03 + 2*0.09/1.6 + 0.045/0.015)^(-1)
 
 
 
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