Under 2021 IPC Table 704.1, what minimum slope applies to 4-inch horizontal sanitary drainage piping that is not upstream of a grease interceptor?
Correct Answer
A) 1/8 in. per ft
The 4-inch pipe falls in the 3–6 inch row: 1/8 inch per foot minimum. Larger slopes are not wrong merely for exceeding that minimum. Section 704.1 separately requires 1/4 inch per foot upstream of a grease interceptor; that condition is excluded here. Source: https://codes.iccsafe.org/s/IPC2021P1/chapter-7-sanitary-drainage/IPC2021P1-Ch07-Sec704.1
Why This Is the Correct Answer
The 4-inch pipe falls in the 3–6 inch row: 1/8 inch per foot minimum. Larger slopes are not wrong merely for exceeding that minimum. Section 704.1 separately requires 1/4 inch per foot upstream of a grease interceptor; that condition is excluded here. Source: https://codes.iccsafe.org/s/IPC2021P1/chapter-7-sanitary-drainage/IPC2021P1-Ch07-Sec704.1
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