A residential building has a ground elevation of 100 feet above sea level. What is the minimum required slope for the building drain?
- A1/4 inch per foot
- 1/2 inch per foot
- C3/4 inch per foot
- D1 inch per foot
Exam tip
Understand the impact of ground elevation on the required slope of building drains.
Why B is correct
Section R502.1.1 of the 2024 International Residential Code specifies that the minimum required slope for the building drain is 1/2 inch per foot when the ground elevation is 100 feet above sea level. Options a, c, and d are incorrect as they do not meet the code requirements.