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Sheet copper.

Municipal Code of Chicago § 18-29-402.3
in effect
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18-29-402.3 Sheet copper. Sheet copper for general applications, shower pans or flashing of fixtures shall conform to ASTM B152 and shall weigh not less than 12 ounces per square foot (3.7 kg/m 2 ).
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2690939Fetched: 10/24/2026

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18-29-402.3 | Corpus