NFPA 13 A.220.127.116.11 refers to cloth or paper dust tops. What is a dust top
The definition of "dust top" must be in the minds of the technical committee who promulgation this recommendation in the standard. Maybe someone to knows this topic can elaborate (present a theory, a policy, or a system in detail ) on the context of NFPA 13 A.18.104.22.168.
I am going with a cloth or plastic, installed temp/ permanent below the actual ceiling.
Like this, which is supposed to be approved by 13::
Thanks for cda definitions of the dust tops. To me the use of them in the example photos could be more permanent use.
Excerpts from the 2016 NFPA 13:
I occasionally saw 6 mil polyethylene sheets hung under sprinklers during remodeling projects. Since it is temporary planned sprinkler obstruction, should not the fire watch provisions of NFPA 25 for a planned impairment of the sprinkler system suffice for interim safety while the building is occupied? I have previously approved the polyethylene sheets obstructing sprinklers based on an acceptable impairment policies and procedures complying to the Life Safety Code and NFPA 25. Am I thinking wrong?
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