spacing at 24 in. (610 mm) o.c., with 3½ in. (89 mm) thick glass fiber batt insulation • 2 in. (51 mm) max. thick foamed plastic • 1 in. (25.4 mm) min. air space • 4 in. (102 mm) nominal brick veneer with wall anchor ties attached to studs at max. 24 in....