Under 2024 IRC P3005.3 (May 2024 printing), what is the minimum uniform slope for a 2-inch horizontal sanitary drainage pipe?
- 1/4 inch per foot
- B1/8 inch per foot
- C1/2 inch per foot
- D3/8 inch per foot
Where to look it up
https://codes.iccsafe.org/content/IRC2024P2/chapter-30-sanitary-drainage
Why A is correct
P3005.3 puts 2-inch horizontal drainage pipe in the 2-1/2-inch-and-smaller category, which requires at least 1/4 inch per foot. The 1/8-inch-per-foot limit belongs to pipe 3 inches or larger. Larger slopes among the choices are above the stated minimum; they are not the minimum asked for. P2803 is not the sanitary drainage slope provision. Source: https://codes.iccsafe.org/content/IRC2024P2/chapter-30-sanitary-drainage