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 of fiberglass insulation.)


See the Instructor's Manual (IM).

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