NFPA 13 in talking about concealed spaces uses the language "Concealed spaces of exposed combustible construction shall be protected by sprinklers."
What does the term "exposed" construction mean?
We have a wood deck structure with a steel frame and a un-heated attic; so trying to figure out how to solve this without a dry system (historic building so spray foam on the interior is economical).
It would be nice to put an ignition barrier/thermal barrier on the wood deck and then not provide a sprinkler system. (concrete deck of the attic).
Thanks in advance for your take.
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