Question: do idf rooms need to be fire rated?
Answer: 2.1 for hazardous areas. If the IDF rooms were built after 3/11/2003, larger than 100 square feet, and if combustibles are stored inside, then the walls must be 1-hour rated and extend from the floor to the deck above. The door to the room would have to be ¾ hour fire-rated, self-closing, and positive latching.