What is the minimum length of lumber required for a roof rafter for the following conditions? 1.when a building with the outside dimensions is 24 ft 2 The roof pitch is 8/4 3. The length of the over hang is 2 ft. 0 in.

What is the minimum length of lumber required for a roof rafter for the following conditions? 1.when a building with the outside dimensions is 24 ft 2 The roof pitch is 8/4 3. The length of the over hang is 2 ft. 0 in.