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If you work in and out of the residential design space, you may come across this question quite a bit. A couple of years ago I wrote on this topic and put together a brief summary of the differences from a design and code perspective. This one gained a lot of traction and attention, and was included in the National Fire Sprinkler Magazine's Member takeover in the September/October 2020 Edition. An updated cheatsheet is attached and includes some great feedback I've had since that 2018 article. Thanks & hope you have a great weekend! 
11/20/2020 09:53:45 am
I think this is a great summary and I applaud your work. I would have like to see "Up to 4" and "Up to 2" to the 13R and 13D row on "Max Number of Adjacent Calculated Residential Sprinklers". There are also time on a 13 system where the sprinkler listing drives system demand on new systems because the .1 is based on SxL. I would have also liked to see that "NFPA 13 Hydraulic
Joe Meyer
12/4/2020 04:33:10 pm
Mark - these are really great comments, and I agree those clarifications would be very helpful. I'll include these updates on the next cheatsheet revision.
Robert Tull
2/4/2021 11:12:56 am
Mr. Meyer - where can I find the "13 vs 13R vs 13D flow diagram"? I may have missed it. Is it able to be downloaded?
Joe Meyer
2/4/2021 04:41:31 pm
Hi Robert - check out this link: Comments are closed.
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