What is the U-value of the assembly of Question 2? (Reference Review Question 2) Draw...

What is the U-value of the assembly of Question 2?

(Reference Review Question 2)

Draw a plan of the following wall assembly and then determine its R-value. Starting from the outside face of the wall, the assembly consists of the following layers.

4-in. nominal (-actual) brick veneer

2-in. air cavity

0.75-in.-thick extruded polystyrene sheathing

2 X 4 studs with 3.5-in.-thick fiberglass insulation

0.5-in.-thick gypsum wallboard

(Note: In calculating the total R-value, ignore the presence of wood studs and assume that the entire layer consists of fiberglass insulation).