Plumbing & Pipe Repair Diagnostics

What is the minimum slope required by standard plumbing codes for horizontal drainage pipe (e.g. 2-inch pipe)?

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 Correct Incorrect1/4 inch of fall per linear foot of pipe run. If too flat, solids settle; if too steep, water may outrun solids, leaving them stranded behind.

What is the minimum slope required by standard plumbing codes for horizontal drainage pipe (e.g. 2-inch pipe)?

• Completely flat with no slope
• 1/4 inch per linear foot (ensuring water and solids flow together at self-scouring velocity)
• 1/8 inch per 10 feet
• 1 inch per linear foot