A lavatory is installed in a bathroom with a wall-mounted sink. What is the minimum distance from the lavatory to the waste pipe to prevent siphonage?
- A3 feet
- B2 feet
- 4 feet
- D1.5 feet
Exam tip
Proper spacing between fixtures and waste pipes is important for preventing siphonage and ensuring drainage efficiency.
Why C is correct
According to Section P278.1 of the 2024 International Residential Code, the minimum distance from a lavatory to the waste pipe is 4 feet to prevent siphonage. This distance ensures that the waste pipe can drain properly without affecting the lavatory's operation.