I have been asked to design a sprinkler system for a 4 story building as per NFPA 13R.  The building has existing standpipes consisting of three 2 1/2” risers.  I am hoping to use the existing standpipe risers to also feed the sprinkler system.  

In this scenario would it make sense to include a hose allowance even though NFPA 13R does not require it?   Also, since NFPA 13R doesn’t require zoning by floor, would it be plausible to have one single “Standpipe & Sprinkler Water Flow Alarm” at the water entry?  

I appreciate and respect your input.  

​​​​Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe

I have an inspector who wants me to prove that calculating run or through tees is appropriate for 13 Residential systems.

I showed them that run tees are in 13D, he thinks they should be calc'd in 13? How do I prove something is not in a code?

Any help would be appreciated.

​​​​Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe

Does the proximity to a residence and the number of windows make a difference in which system is used (NFPA 13 vs 13R vs 13D)?

​What are those requirements that make it change?

Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe

I recently came across your 13, 13R Summary of differences sheet and was wondering if you could explain or site a section that explains how NFPA 13R cannot be considered “fully-sprinklered” for code purposes? Thank you in advance for any help.

Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe