Design the external cavity wall and internal single leaf load$-$bearing wall for the single$-$storey building shown below. Assume that the internal wall is made from solid concrete blocks of length $390$ mm$,$ height $190$ mm and thickness $100$ mm and that the external wall consists of $102\mathrm{.}5$ mmthick brick outer leaf with $390\backslash$times $190\backslash$times $100$ concrete block. Assume that the manufacturing and construction controls are special and normal respectively and that the self$-$weight of the brick and blockwork is $2\mathrm{.}2$ kN m$^2.$Roof dead load $($including self weight$)=5\mathrm{.}5kN{m}^{-2}$

Roof imposed load $=1\mathrm{.}5kN{m}^{-2}$