The code states that a cleanout is required at the start of every horizontal branch and at 100' intervals thereafter. It also states that a cleanout is required at a 45 degree or greater change in direction, but a single cleanout is sufficient for multiple changes in direction as long as they occur within 40' of each other.
1) It would stand to reason that a horizontal branch that is 40' or shorter would require a single cleanout, as long as the same pipe size is maintained throughout, yet the code does not say that. What's your take on the proper interpretation here? This is not a theoretical question... there are plenty of instances where cutting into existing plumbing at the first turn is simply not feasible, and you'd think that having a 0 degree "turn" as your "first turn" would present less impediment to any snaking than having a >0 degree turn.
2) Does a horizontal drain that briefly dips a few inches at a 45 degree or higher angle still qualify as a horizontal branch, or if not, what is it? I can find no definition of, or requirements for, vertical offsets in horizontal branch drains, such as what would occur when the drain runs between the joists but then drops into a soffit to run perpendicular to the joists.
1) It would stand to reason that a horizontal branch that is 40' or shorter would require a single cleanout, as long as the same pipe size is maintained throughout, yet the code does not say that. What's your take on the proper interpretation here? This is not a theoretical question... there are plenty of instances where cutting into existing plumbing at the first turn is simply not feasible, and you'd think that having a 0 degree "turn" as your "first turn" would present less impediment to any snaking than having a >0 degree turn.
2) Does a horizontal drain that briefly dips a few inches at a 45 degree or higher angle still qualify as a horizontal branch, or if not, what is it? I can find no definition of, or requirements for, vertical offsets in horizontal branch drains, such as what would occur when the drain runs between the joists but then drops into a soffit to run perpendicular to the joists.