Problem #$3-$ Adding Windows and Doors $(10$ Points$)$

$3.$a$)$ Now let's calculate the aggregate $U$ value of this wall assembly when it has $3$ windows and $1$ door placed in it$.$ Assume we are still looking at a $12$ ft tall x $40$ ft wide section of wall.

The area of the wall that is not a door or wall will have a U value based on your previous answer to Problem $2.$ This will be combined with the $U$ values for the windows and doors to calculate an overall weighted $U$ value for the system comprised of the wall assembly, door, and windows.

Assume the windows are triple glazed Low E Krypton filled windows $($U$-0\mathrm{.}125)$ and are ${36}^{\text{'}\text{'}}{36}^{\text{'}\text{'}}$

Assume the door is a $1-\frac{1}{2}$ inch steel clad door $($R$-6).$ Assume the door is $8ft3ft.$

$3.$b$)$ Calculate the $R$ Value of the entire wall system including windows and doors.

Problem #$2-$ Adding blue insulation and siding. $(10$ points$)$

$2.$a$)$ Now that you have calculated the $R-$value for the $26$ and insulation portion of the assembly, calculate the R value that is achieved by adding the blue exterior foam board $(R-5)$ and an exterior siding layer $($ R $0\mathrm{.}6$ to the wood framing and pink batt insulation layer.

$2.$b$)$ Calculate the new $U$ Value for this combined assembly of framing, pink batt insulation, bluexterior foam board insulation and siding.