5.1 Using the appropriate table, determine the individual R-values of the following materials: a. a. 4-in. nominal (actual 35 8-in.) thickness brick wall b. b. 5 -in.-thick gypsum board c. c. 2-in.-thick extruded polystyrene board 5.1 Using the appropriate table, determine the individual R-values of the following materials: a. a. 4-in. nominal (actual 35 8-in.) thickness brick wall b. b. 5 -in.-thick gypsum board c. c. 2-in.-thick extruded polystyrene board