Plumber Red Seal · Question
In a multi-story building, where are suds pressure zones most likely to occur?
Suds pressure zones are created by the churning of soapy water at the bottom of a tall drainage stack. This can generate positive pressure in lower-floor branch
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Question: In a multi-story building, where are suds pressure zones most likely to occur?
Answer options:
- In the vent stacks on upper floors.
- In the horizontal branch drains serving kitchens. ✅ Near the base of a drainage stack that receives discharge from upper-floor laundry facilities.
- In fixture traps that are oversized.
Correct answer: Near the base of a drainage stack that receives discharge from upper-floor laundry facilities.
Explanation: Suds pressure zones are created by the churning of soapy water at the bottom of a tall drainage stack. This can generate positive pressure in lower-floor branch drains, potentially forcing suds and gases past fixture trap seals.
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