We have a project where we are having a discussion about how many heads we need to flow. There are a couple of different scenarios: (NFPA #13-2010) 1) New wood truss attic overframing onto an existing shingled roof. 4/12 pitch. Normally 2,535 sq. ft. for dry system & roof pitch. One area of a new attic is 1,200 sq. ft. Would we have to include 1,335 sq. ft. into the existing attic if there are no openings between them? If not, where does it say so. 2) 2,260 sq. ft. new attic. They will be sheet rocking the bottoms of the trusses, and one side of a truss to make it into two 1,130 sq. ft. areas. Then basically the same question as above, do we design for !,130 sq. ft. flowing, or 2,260 sq. ft. I believe that we would flow each small area, but I could not find it.
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