Depends on whether it is an NFPA 13 job or an FM job. NFPA does not say but FM calls the top of the flutes as the ceiling if they are wide enough between flutes. Don't recall the width offhand but think if 6 inches wide then you use the top of the flutes.
John Hoffman -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of G. Tim Stone Sent: Thursday, March 13, 2014 1:32 PM To: [email protected] Subject: Warehouse Ceiling Question? What is the Ceiling in a Warehouse? Scenario: Packaged Steel Frame Building. Red iron frames spaced 30' between. 12" steel Z shaped purlins, spaced 3'-7" on center on top of the Red Iron frames. Steel Q-Deck pan (about 3.5" - 4" deep) attached to top of the Z purlins. High point of the building is 30'-0" AFF, ΒΌ : 12 roof pitch. The building insulation is on top of the Q-Deck. No vinyl insulated blanket that we usually see in warehouse construction. The occupancy is Group A Plastics, High Piled and rack storage, Storage height to 17'-0 AFF, ESFR Pendent Sprinklers, Depending on Manufacture used, deflectors can be up to 18" down below "CEILING". Is the "CEILING" at the point where the Q-Deck that rests on top of the purlin or is it the top of the pocket formed in the Q-Deck? I will rephrase, Is the "CEILING" at the top of the purlin or 3.5" - 4" higher (high point of Q-Decking)? Thank you in advance for clarification. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 [email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
