So I got something thrown my way recently that's got my curiosity. A new one on me.
Existing 2 family 2 story home (slab on grade) with a variance for an ADU (additional dwelling unit). 2015 IBC, 2013 NFPA. AHJ decision states: "1F+ADU's do not need to sprinkle the ADU. 2+ADU may use tank system (NFPA 13D). 3+ADU must have a water line to the street (NFPA 13). It is preferred that you install a sprinkler system in common areas when Installing a sprinkler system in the ADU." Plans show converting what's called a "Bonus Room" on the first floor into a Kitchen, Bedroom and Closet by means of a few new walls. Would you treat this a vanilla 2 head design D system with pump and tank (10 minutes vs. 20)? Thanks, Tom Duross
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