May 09 2016

Hazardous Rooms of Different Options

Category: Hazardous Areas,Questions and AnswersBKeyes @ 12:00 am
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Q: There appears to be many different ways a hazardous room is maintained: If it is sprinklered, does it have to be 1-hour rated? If it is existing construction, does it have to be sprinklered? What rules apply if there is a lay-in ceiling? What are the basic requirements for a hazardous room?

A: A hazardous room in a hospital includes a room larger than 50 square feet used for the storage of combustible supplies. How many combustible supplies are needed to make it a hazardous room? Not much, but it is a judgment call by the surveyor. If the room is designated ‘existing conditions’ (created prior to March 11, 2003) then there are two options on how it has to be maintained:

  • If there are no sprinklers in the room, then the walls need to be one-hour fire rated and extend from the floor to the deck above, and the door to the room needs to be ¾-hour fire rated, self-closing and positive latching.
  • If there are sprinklers in the room, then the walls only have to be smoke resistant, and extend from the floor to the ceiling, as long as the ceiling also resists the passage of smoke. The door to the room may be non-rated, but must be self-closing and positive latching.

If the room is designated ‘new conditions’ (created on or after March 11, 2003) then there is only one option for the room: The room must be sprinklered, and the walls must be one-hour fire rated and extend from the floor to the deck above, and the door must be ¾-hour fire rated, self-closing and positive latching. Also, if the supply room was originally constructed to ‘new conditions’, but before March 11, 2003, it cannot be down-graded to ‘existing conditions’, but must be maintained as ‘new conditions’. Any ceiling that has sprinklers or smoke detectors must be maintained to resist the passage of smoke. This is because smoke and heat will migrate above the ceiling if there are cracks, voids or missing tiles, and the detectors and sprinklers may not activate properly.