Illinois Plumbing Code Practice

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What is the required minimum grade per foot for horizontal drainage piping larger than 3 inches but less than 8 inches in diameter?

  1. 1/16 inch

  2. 1/8 inch

  3. 1/4 inch

  4. 3/8 inch

The correct answer is: 1/8 inch

For horizontal drainage piping larger than 3 inches but less than 8 inches in diameter, the required minimum grade per foot is 1/8 inch. This specific slope ensures that the flow of wastewater and solids within the pipe is efficient and prevents blockages or backups. A slope that is too shallow can result in standing water and potential clogs. Therefore, maintaining the correct minimum slope per foot, as specified in the Illinois Plumbing Code, is crucial for proper drainage in plumbing systems. Options A, C, and D provide incorrect minimum grades per foot for horizontal drainage piping within the specified diameter range.

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