For example, if a roof has a 6 in 12 slope and the roof framing is 16 inches OC, the difference in the length of jack rafters is _________ inches.

Question

Quizplus · Accepted Answer

The difference in the length of jack rafters is calculated using the formula: (run difference) x (slope factor). For a 6 in 12 slope, the slope factor is approximately 1.118. With a 16-inch OC spacing, the run difference is 16 inches. Therefore, the difference in length is 16 x 1.118 = 17.888 inches, which rounds to 17 1/8 inches.

For Example, If a Roof Has a 6 in 12