Under the ordinary slope rule in 2025 CPC 708.1, a 3-inch horizontal building drain is laid at 1/4 inch fall per foot. What fall is needed over a 64-foot horizontal run?
Correct Answer
D) 16 inches total.
2025 CPC 708.1 sets the ordinary minimum slope at 1/4 inch per foot. For this 3-inch drain, 64 × 1/4 = 16 inches of fall. The reduced-slope exception concerns building drains at least 4 inches in diameter under specified impracticality conditions and prior approval. Source: https://epubs.iapmo.org/2025/CPC/
Why This Is the Correct Answer
2025 CPC 708.1 sets the ordinary minimum slope at 1/4 inch per foot. For this 3-inch drain, 64 × 1/4 = 16 inches of fall. The reduced-slope exception concerns building drains at least 4 inches in diameter under specified impracticality conditions and prior approval. Source: https://epubs.iapmo.org/2025/CPC/
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