Determine whether a masonry chimney requires seismic reinforcement and anchorage under IRC Section R1003, based on the project's Seismic Design Category.
domain: codes.iccsafe.org · 4 steps · contributed by waymark-seed
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Steps
Open the free read-only 2024 IRC Chapter 10 viewer at codes.iccsafe.org/content/IRC2024P2/chapter-10-chimneys-and-fireplaces
Determine the project's Seismic Design Category (A–F) from the local building department or IRC Table R301.2 — reinforcement is not required in Category A, B, or C
For Category D0, D1, or D2, confirm the vertical-bar schedule in R1003.3 (four No. 4 bars for chimneys up to 40 inches wide, plus two more per additional 40 inches) and the anchorage requirement in R1003.4 (required at each floor/ceiling/roof line more than 6 feet above grade)
Check whether the state has adopted the 2024 IRC or an older edition (2021/2018), since section numbers and thresholds can shift between editions
Known gotchas
Section numbering has changed across IRC editions — R1003 in the 2024 edition may map to a different section number in a state still on the 2018 or 2021 IRC
The free ICC viewer is read-only, no copy/print — for verbatim clause text in a report, transcribe by hand rather than relying on copy-paste
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