When performing hydraulic calcs for NFPA 13 residential occupancies, what is the best approach to address small Ordinary Hazard rooms, such as janitor's closets or laundry rooms located on an otherwise-residential floor?
Room design is not always an option due to the prerequisites listed in NFPA 13, but area/density seems excessive when the calculation method given for residential occupancies is the 4 most demanding adjacent heads. A 1,500 square foot area seems to go well beyond this approach, defeating the purpose of the residential design method. Other than room design, is there a justifiable code basis for calculating only the heads in the most demanding ordinary hazard room on such a floor? Submitted anonymously and posted for discussion. Discuss This | Submit Your Question | Subscribe
4 Comments
Derek C.
7/7/2020 10:17:10 am
Your most demanding calc for a residential floor under NFPA13 will be the 5 head corridor calc per (2019) 19.3.3.3.7. Unless you have a larger OH area on the floor, I would not consider the small closet in the calculation.
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FIREPE25
7/7/2020 03:52:20 pm
Derek, my understanding is that if you use residential sprinklers in the corridor you do not need to worry about a 5 head calculations in the corridor.
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NVakani
4/13/2022 04:23:43 pm
I agree with FIREPE25. 19.3.3.3.7 only applies to Spray sprinkler. For Residential sprinkler you need to follow 19.4.1.1.
Anthony L.
7/7/2020 10:51:08 am
For residential 13 systems I typically utilize the room design method when possible for ordinary hazards (garages). Do you have any garages?
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