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Form a Business

Vertical walls.

Municipal Code of Chicago § 18-29-1106.4
in effect
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18-29-1106.4 Vertical walls. In sizing roof drains and storm drainage piping, 25 percent of the area of any vertical wall that diverts rainwater to the roof shall be added to the projected roof area for inclusion in calculating the required size of vertical conductors, leaders and horizontal storm drainage piping.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692790Fetched: 10/24/2026

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18-29-1106.4 | Corpus