Question $2(35$ points$)$

For the stud wall described, find the summer $U$ value across the wall. Use

values provided below as appropriate.

External air film

$(1)3-1/2"$ face brick

$(2)\frac{3}{4}"$ air space

$(3)1-1/2"$ Polyisocyanurate

$($hint: $R_m$ is Resistivity not Resistance$)$

$(4)24$ @ $16\text{'}$ o$.$c$.$ studs or

$(R=0\mathrm{.}35)$

$(R=1\mathrm{.}0)$

$(R_m=5\mathrm{.}4)$

$(R=3\mathrm{.}5)$

$(R=13\mathrm{.}0)$

$(R=0\mathrm{.}45)$

$(5)\frac{1}{2^{\text{'}2}}$ G$.$W$.$B$.(=0\mathrm{.}9)$

Internal air film