Residential Building Inspector B1Wall Construction and Wall CoveringsMedium
An inspector is reviewing plans for a residential building with a garage located beneath habitable spaces. What is the minimum fire-resistance rating required for the separation between the garage and the habitable space above?
- A1/2-hour
- B1-hour
- C3/4-hour
- D2-hour
Show answer & explanationAnswer & explanation
Correct answer: B. 1-hour
According to IRC Table R302.6, a 1-hour fire-resistance-rated separation is required between a garage and habitable space located above it. This applies to both the floor assembly and any walls separating the spaces.
Why the other options are wrong
- A. 1/2-hour separation is required for garage walls adjacent to habitable spaces, but not for spaces above.
- C. This is not a standard fire-resistance rating for garage separations in residential construction.
- D. 2-hour ratings are typically for more stringent commercial or multi-family applications, not standard residential garages.
Garage-Habitable Space Fire Separation
Code-required fire-resistance ratings for assemblies separating a garage from adjacent or overhead habitable spaces to prevent fire spread.
- 1-hour rating for spaces above.
- 1/2-hour rating for walls adjacent.
- Ensures occupant safety in case of garage fire.
Memory trick: Garage below, one hour to go.