CSLB General Building (B)Framing and CarpentryEasy
A building inspector checks a two-story stud wall and requires fireblocking be installed in concealed vertical spaces. What is the maximum vertical interval allowed between fireblocking in a wood-framed stud wall per the California Residential Code?
- A6 feet
- B4 feet
- C10 feet
- D16 feet
Show answer & explanationAnswer & explanation
Correct answer: C. 10 feet
Fireblocking is required at maximum vertical intervals of 10 feet in concealed spaces of stud walls, including furred spaces, to stop the spread of fire and smoke through wall cavities. This applies to both platform and balloon framing.
Why the other options are wrong
- A. Also shorter than the required maximum interval.
- B. Too short an interval; not the code requirement.
- D. Too long; would allow excessive unblocked cavity height.
Fireblocking Interval
Fireblocking must be installed in concealed wall cavities at vertical intervals not exceeding 10 feet to limit fire spread.
- Max 10-ft vertical spacing in stud walls
- Also required at floor/ceiling levels and stair stringers
- Materials: 2x lumber, gypsum, or approved noncombustible material
Memory trick: Ten feet, block the heat.