Find the thermal resistance (R) values of the following materials:
a. 8 in thick lightweight concrete block
b. 3⁄8 in thick plywood
c. 2 × 8 (71⁄4 in actual thickness) softwood lumber
d. 3⁄4 in fiberglass insulation board
e. 5⁄8 in thick gypsum wallboard
f. Asphalt shingles (1⁄8 in thick)
g. 12 in thick cellulose insulation blown into an attic space