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NYC Plumbing Code

§ 1106.3 — § 1106.3

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What is NYC PC § 1106.3?

Quick Answer

This section outlines the requirements for sizing vertical leaders based on the flow rate from horizontal gutters or roof drains. It specifies that the flow rate through vertical leaders must not exceed the limits provided in Table 1106.3. Applies to building owners responsible for drainage systems.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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1106.3 Vertical leader sizing.

PC § 1106.3

Vertical leaders shall be sized based on the flow rate from horizontal gutters or the maximum flow rate through roof drains. The flow rate through vertical leaders shall not exceed that specified in Table 1106.3. Table 1106.3Vertical Leader Sizing Size of Leader(inches)Capacity(gpm)Size of Leader(inches)Capacity(gpm)2302 × 2301 1/2 × 2 1/2302 1/2542 1/2 × 2 1/2543922 × 4922 1/2 × 39241923 × 4 1/41923 1/2 × 419253604 × 53604 1/2 × 4 1/236065635 × 65635 1/2 × 5 1/2563812086 × 81208 For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.

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