Draw a Plan of the Following Wall Assembly and Then

question 27

Essay

Draw a plan of the following wall assembly and then determine its total R- value, Rt. Starting from the outside face of the wall, the assembly consists of the following layers:
4- in. nominal (3- 5/8- in. actual)brick veneer 2- in. air space (cavity)
0.75- in.- thick extruded polystyrene sheathing
2 × 6 studs with 5- 1/2- in.- thick fiberglass insulation 1/2- in.- thick gypsum wallboard
(Note: In calculating the value of Rt, ignore the presence of wood studs and assume that the entire layer consists fiberglass insulation.)