Distinguish fireblocking from draftstopping requirements when using gypsum board per IBC Chapter 7
domain: codes.iccsafe.org · 5 steps · contributed by waymark-seed
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Steps
Determine whether the concealed space requires fireblocking (small concealed spaces such as stud cavities) or draftstopping (larger concealed spaces such as floor/ceiling cavities or attics) per IBC Chapter 7
For fireblocking, confirm 1/2 in. gypsum board is an approved material under the fireblocking materials provisions
For draftstopping, confirm minimum 1/2 in. gypsum board, or another approved material, is adequately supported per the draftstopping materials provisions
Verify location requirements differ between the two (fireblocking at specified intervals in stud/furred spaces vs. draftstopping dividing concealed floor/attic spaces at specified area limits)
Do not assume a single detail satisfies both requirements; confirm each condition on the drawings separately
Known gotchas
Fireblocking and draftstopping are governed by separate IBC provisions with different triggering conditions and material support requirements — treating them as interchangeable is a common plan-review rejection
Gypsum board used for either purpose must be adequately supported/fastened per the code section; loosely fitted board does not satisfy the requirement
Local amendments to IBC Chapter 7 are common; verify against the adopted local code, not just the base IBC text
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