Can you run sprinkler pipe underground after the riser has entered the building?
The building we're working on is an apartment building that is being sprinklered to NFPA 13R (2016 Edition). The apartment is 4-story and has open air breezeways. There are dry sidewalls protecting the breezeways.
The owner wants to run pipe under the slab in the open air breezeways instead of providing a heated path for sprinkler pipe across the breezeway. I have strongly recommended against this, but have gotten pushback from the owner and contractor regarding this pipe arrangement.
Is this underground arrangement allowed?
I believe there are some cases where this is acceptable but not many. Thanks in advance!
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