Plumber Red Seal · Question
In a multi-story building, where must a cleanout be located for a vertical drainage stack?
Cleanouts are critical for maintenance. The NPC requires cleanouts at the base of every stack and at the upstream end of the building drain to allow access for
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: In a multi-story building, where must a cleanout be located for a vertical drainage stack?
Answer options:
- At its base and at every second storey.
- Only at the highest point, which serves as a vent. ✅ At the base of the stack and at its connection to the building drain.
- At or near the base of the stack, and at upper terminals if required.
Correct answer: At the base of the stack and at its connection to the building drain.
Explanation: Cleanouts are critical for maintenance. The NPC requires cleanouts at the base of every stack and at the upstream end of the building drain to allow access for clearing blockages in both the vertical and horizontal sections.
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
More about Plumber Red Seal
Related Questions
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
- A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Ex
- A plumber is designing the domestic hot water recirculation system for a multi-story residential building. Wha
More for Plumber Red Seal candidates
Practice tests
Question explanations
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Plumber Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.