Minnesota Residential Roofer Practice Test

If common walls have sprinklers, what is the minimum fire-resistance rating?

0-hour fire-resistance-rated wall assembly. Minimum 1-hour fire-resistance-rated wall assembly. Minimum 2-hour fire-resistance-rated wall assembly. Minimum 3-hour fire-resistance-rated wall assembly.

Correct Answer:

Minimum 1-hour fire-resistance-rated wall assembly.

Explanation:

Common walls that separate dwelling units are meant to act as fire separations, slowing the spread of fire between units and giving occupants time to escape. Automatic sprinklers help control a fire, but they don’t replace the need for passive fire resistance in the wall. Because of that, the wall between units must be fire-resistance-rated for at least one hour, ensuring the separation remains intact long enough for safety even if the sprinklers aren’t operating perfectly. Choosing a rating higher than one hour isn’t required for typical residential construction, while a zero-hour rating would fail to provide the necessary protection.

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