Dry Standpipes Routed Underground?

11/30/2018

Have a dry manual standpipe system that is going to be retrofit along exterior stairs in the southern US. Is there any requirement that would prevent the standpipe from being interconnected underground (not under the building)?

I understand there's difficulties with drainage and access for future repairs, but as a last option is it even permissible by code?

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1 Comment

12/4/2018 01:42:47 pm

In theory, yes - but you would need a ruling by your AHJ. Two notes:
1) The buried manual dry standpipe would require supervisory air pressurization per NFPA 14 Section 6.1.1.
2) Underground standpipes are treated as private service mains, and fall under NFPA 24. (See NFPA 14 Section 6.2.) Note that NFPA 24 doesn't explicitly govern dry systems - so a ruling would be needed.

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