Estimate the heat$-$transfer rate per square foot through a flat, built$-$up roof$$ceiling

combination similar to that shown in Table $5-4$b$,$ construction $2.$ The ceiling is

$0\mathrm{.}75$ in$.$ metal lath and lightweight aggregate plaster with an additional $4$ in$.$

fibrous glass batts above. Indoor and outdoor temperatures are $72$ F and $5$ F$,$

respectively.

$($The ceiling layer is the Layer $8$ in Table $54$b$.)(15$ points$)$