Interior Stairwells require sprinklers under which condition?

Interior Stairwells require sprinklers under which condition?

• A. Exterior stairwells only.
• B. No stairwells need protection.
• C. Interior stairwells that are enclosed.
• D. Only in high-rise buildings.

Answer: (D)

NFPA 13R focuses on protecting the living spaces in low-rise residential buildings and does not require sprinkler protection in interior stair enclosures for that type of structure. The condition that triggers sprinklering interior stairwells is when the building is classified as high-rise. In high-rise buildings, interior stair enclosures become critical to maintain tenable egress conditions and limit fire spread across multiple floors, so sprinklers are required there. The other options don’t fit the standard's scope: exterior stairwells aren’t the trigger, and saying no stairwells require protection isn’t accurate for higher-rise buildings where protection of the stairs becomes necessary.

NFPA 13R focuses on protecting the living spaces in low-rise residential buildings and does not require sprinkler protection in interior stair enclosures for that type of structure. The condition that triggers sprinklering interior stairwells is when the building is classified as high-rise. In high-rise buildings, interior stair enclosures become critical to maintain tenable egress conditions and limit fire spread across multiple floors, so sprinklers are required there. The other options don’t fit the standard's scope: exterior stairwells aren’t the trigger, and saying no stairwells require protection isn’t accurate for higher-rise buildings where protection of the stairs becomes necessary.