For the following surfaces, find the thermal resistance (R) of the following air films and confining air spaces (cavities) in U.S. units:
a. Interior painted gypsum wallboard (nonreflective) wall surface in winter
b. Interior painted gypsum wallboard (nonreflective) wall surface in summer
c. Exterior brick wall surface in winter
d. Exterior brick wall surface in summer
e. Interior wood (nonreflective) floor surface in winter
f. Interior wood (nonreflective) floor surface in summer
g. Exterior roof surface in winter
h. Exterior roof surface in summer
i. 1⁄2 in wide wall cavity between nonreflective surfaces (ε = 0.9) based on winter temperatures
j. 1⁄2 in wide wall cavity between nonreflective surfaces (ε = 0.9) based on summer temperatures
k. 31⁄2 in wide cavity between nonreflective surfaces (ε = 0.9) based on winter temperatures
l. 31⁄2 in wide cavity between nonreflective surfaces (ε = 0.9) based on summer temperatures