A residential property is being constructed with a crawl space. The crawl space has a slope of 1/4 inch per foot. Which of the following is the minimum required slope for the drain waste and vent (DWV) system in the crawl space?
- A1/8 inch per foot
- 1/4 inch per foot
- C3/8 inch per foot
- D1/2 inch per foot
Exam tip
Always check the specific requirements for crawl spaces as they may differ from above-grade installations.
Why B is correct
According to Section P2503.1.1 of the 2024 International Residential Code, the minimum slope for the DWV system in a crawl space is 1/4 inch per foot. This ensures proper drainage and prevents the accumulation of waste.