Code Pipe Slopes, Trap Depths,
and Cleanout Locations 2026
Exam Questions and Answers |
100% Pass
What is the minimum slope for a 2" horizontal drainage pipe? - 🧠 ANSWER
✔✔1/4 inch per foot.
, What is the minimum slope for a 3" horizontal drainage pipe? - 🧠 ANSWER
✔✔1/4 inch per foot.
What is the minimum slope for a 4" horizontal drainage pipe? - 🧠 ANSWER
✔✔1/8 inch per foot.
What is the minimum trap seal depth? - 🧠 ANSWER ✔✔2 inches.
What is the maximum trap seal depth? - 🧠 ANSWER ✔✔4 inches.
What is the purpose of a plumbing vent? - 🧠 ANSWER ✔✔To maintain
atmospheric pressure in the drainage system and protect trap seals.
What is a trap arm? - 🧠 ANSWER ✔✔The portion of pipe between the trap
weir and the vent connection.
What determines the maximum trap arm length? - 🧠 ANSWER ✔✔Pipe
diameter and slope.
What is the minimum size vent for a water closet? - 🧠 ANSWER ✔✔2
inches.
What is the minimum diameter of vent through the roof in cold climates? - 🧠
ANSWER ✔✔3 inches.