Consider a composite wall that includes an $8-mm-$thick hardwood siding, $40-mm$ by $100-mm$ hardwood studs on $0\mathrm{.}65-m$ centers with

glass fiber insulation $($paper faced, $28k\frac{g}{m^3}),$ and a $12-mm$ layer of gypsum $($vermiculite$)$ wall board. What is the thermal resistance

associated with a wall that is $2\mathrm{.}5$ m high by $6\mathrm{.}5$ m wide $($having $10$ studs, each $2\mathrm{.}5$ m high$)?$ Assume surfaces normal to the x $-$direction

are isothermal.

$R_{\text{t}\text{o}\text{t}}=$

K$/$W