Does Draftstop Require Firestopping?
We are a sprinkler contractor running into a new situation for an apartment building. The apartment is designed under NFPA 13R.
We have an inspector requesting that we firestop a draft stop from the corridor into an apartment.
Can you point us in the right direction whether this is required?
Thanks in advance for your help.
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11/11/2022 08:25:54 am
In Ontario Canada, the concealed open space caused by open web joists, or by roof trusses, is required to be split up into areas of certain square footages, and this 'draft stop' would be referred to as a fire block, which is of fairly minimal construction, and generally doesn't have a Fire Resistance Rating associated with it.
Todd E Wyatt
11/11/2022 09:15:23 am
11/11/2022 09:54:49 am
To add to this, you'll want to make sure that the construction of the corridor FP membrane meets the requirements of 708.4. In the drawing provided, it looks like the apartment side of the wall conforms with a standard UL FRR sketch, but if the corridor ceiling is not constructed in the same arrangement as the corridor wall it is possible that the membrane in question is not actually a draftstop, but instead is a continuation of the corridor's fire partition membrane.
11/11/2022 10:08:40 am
If it's a 13r per my knowledge you consider the concealed space. If it's design 13r.
11/12/2022 07:25:36 am
this is coming from chapter 7 of the IBC. But in a NFPA 13R system if the draftstopping is ommited then sprinkler protection is required in the concealed space.
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