Interior chimneys or those in an exterior wall keep 2 in airspace to combustibles; chimneys fully outside the walls keep 1 in; the gap stays open except for fireblocking.
Clearance exceptions: UL 1777 zero-clearance liners allow contact; built into a masonry wall or abutting the sidewalls, combustibles stay 8 in from the inside of the nearest flue liner.
Roofs that don't drain off their edges need a drain at every low point, plus overflow drains (2 in above the low point) or scuppers three times the drain size and 4 in tall where parapets could trap water.
Searches all 4,276 IRC 2024 sections, 5,532 IBC 2024 sections and defined terms (Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 so far) and each city's local rules as they are added. Section numbers and titles from the International Residential Code and International Building Code, 2024 editions, copyrighted by the International Code Council; the IRC's electrical chapters (34 to 43) follow NFPA 70, the National Electrical Code. Requirements are summarized in our words (IRC Chapters 3 to 43, IBC Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33); read the full text at the link on each result. Local values come from each city's published documents.
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