13, 13R, 13D: Calculations and High Ceilings
I was reading through NFPA 13 (2016 ed.) and caught Section 188.8.131.52:
Residential Sprinklers shall not be permitted to be used on ceilings with slopes greater than 8 or 12 or ceiling heights greater than 24 feet unless specifically listed for this purpose.
This got me curious about how it affects NFPA 13R and 13D, checking into those I didn't see any restrictions where residential sprinklers stop being allowed at the ceiling height, however the maximum 24-ft ceiling was noted in NFPA 13D (2019) 10.2.1 and NFPA 13R (2019) 184.108.40.206.1 in regards to design sprinklers.
So am I correct in assuming that if you have a residence with a 24'-1" foot ceiling in the family room (say there's a loft second floor), that you now have to calculate and design the space per NFPA 13 rather than 13R or 13D (as that ceiling height is outside of the scope of 13R and 13D)?
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7/7/2021 08:09:00 am
I'd check the data sheet first and 24'-1“ exceeds the height limits.
7/7/2021 08:24:13 am
It was a hypothetical.
7/7/2021 09:11:40 am
NFPA 13 D & R 2016 Handbook clarifies this in the commentary under 6.4.3.
7/7/2021 09:15:14 am
* Typo Correction*
7/7/2021 09:30:28 am
NFPA 13D is a referenced standard per the "applicable" International Residential Code (IRC). "Fire sprinkler systems" are referenced in the 2021 IRC per P2904 which determines the scoping requirements. IRC 2904.1.1 states "sprinklers shall be installed to protect ALL areas of a dwelling unit" but does not include an exception to spaces +24 feet in height. Based on this IRC requirement and the NFPA 13D restriction of using residential sprinklers in spaces +24 feet in height, I would interpret that sprinkler heads meeting NFPA 13 would be required where the IRC requires ALL areas of a dwelling unit to be protected by a sprinkler system and that spaces +24 feet in height would require NFPA 13 sprinkler heads.
10/12/2022 11:10:49 am
Do you know of any residential sprinkler listed for ceilings over 24'?
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