Fire-resistance footnote

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Lila Guizado

February 12, 2023 17:10

Could someone please explain what I am missing on this NCARB practice exam question. 

B footnotes is an exception for group F-1, H, M and S-1. If this is for a theater, which is group A, wouldn't this footnote not apply?

 

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  Benjamin Sullivan February 13, 2023 19:48

  The question includes "the roof is 35 feet from the highest level of seating."

  The exception in the footnote allows roofs to have 0 hr rating if the roof is at least 20 feet above any floor immediately below, & as long as the occupancies are not Groups F-1, H, M, and S-1.

  The exception applies to all occupancies except for Groups F-1, H, M, and S-1. So for Occupancy A, this exception can be used. If the space in the question was a Factory, Hazardous, Mercantile, or Storage occupancy, it would need a higher fire rating based on the probability that there are some flammable items being stored on the level under the roof.

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  Lila Guizado February 15, 2023 21:31

  Thank you, Benjamin. 

  The way the footnote is written is quite confusing. I read it as only for those occupancy groups.

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  Warren Wigh March 29, 2023 04:17

  Yeah but it says "except", this is quite common in IBC because it's easier to list 3 occupancies than the 7 ones it DOES apply to.  It's just how they operate.

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