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Q: In regard to our 2-hour fire-rated walls, they are required to go all the way to roof line on both sides, correct? What about 1-hour fire-rated walls and smoke barrier walls? I am not sure about these walls.
A: No, not necessarily. A 2-hour barrier that separates occupancies or is a horizontal exit is not required to extend beyond the floor or deck above, provided the floor and deck above is also rated for 2-hours. A 2-hour barrier that separates vertical openings (i.e. stairwells) is only required to extend as far as the vertical opening.
However, you are correct in that a 2-hour barrier serving as a separation between two different construction types is required to extend from the lowest level to the roof line, in a vertical fashion without any horizontal runs. No exceptions.
Barriers that are 1-hour fire rated or are smoke barriers are only required to extend from the floor to the deck above, unless the 1-hour barrier serves a vertical opening then it needs to only extend as far as the vertical opening.