1507.9.8 Application.
BC § 1507.9.8
Wood shakes shall be laid with a side lap not less than 1 1/2 inches (38.1 mm) between joints in adjacent courses. Spacing between shakes in the same course shall be 3/8 to 5/8 inches (9.5 to 15.9 mm) for shakes and taper sawn shakes of naturally durable wood and shall be 1/4 to 3/8 inch (6.4 to 9.5 mm) for preservative taper sawn shakes. Weather exposure for wood shakes shall not exceed those set in Table 1507.9.8. Table 1507.9.8Wood Shake Weather Exposure and Roof Slope Roofing Material Length (inches)Grade Exposure (inches)4:12 Pitch or SteeperRoofing Material Length (inches)Grade Exposure (inches)4:12 Pitch or SteeperShakes of naturally durable wood18 No. 1 7.5 24No. 110 aPreservative-treated taper sawn shakes of Southern yellow pine18No. 17.524No. 11018No. 25.524No. 27.5Taper sawn shakes of naturally durable wood18No. 17.524No. 11018No. 25.524No. 27.5 For SI: 1 inch = 25.4 mm. a. For 24-inch by 0.375-inch handsplit shakes, the maximum exposure is 7.5 inches.
