Under SC building codes, what is the minimum required fire rating for a wall separating a garage from living space in a residential building?
Correct Answer
B) 45 minutes
SC building codes require a minimum 45-minute fire rating for walls separating attached garages from residential living spaces.
Why This Is the Correct Answer
South Carolina's residential building code (adopted IRC) requires a minimum 45-minute fire resistance rating for walls separating an attached garage from the dwelling's living space. This rating helps contain a vehicle fire long enough for occupants to escape.
Why the Other Options Are Wrong
Option A: 30 minutes
30 minutes is below the required threshold. While some assemblies carry a 30-minute rating, it does not meet the minimum for a garage-to-living-space separation under the applicable code.
Option C: 90 minutes
90 minutes is a fire rating associated with more intensive occupancy separations (e.g., commercial assemblies or high-rise construction), not residential garage walls.
Option D: 60 minutes
60 minutes exceeds the minimum requirement for this application. The code specifies 45 minutes as the threshold — choosing 60 minutes would make construction unnecessarily expensive without code basis.
Memory Technique
45 minutes = just enough time for 'forty-five family escape.' The wall between the garage and home must hold fire for 45 minutes minimum so the family can get out safely.
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