3.9.1.14* Miscellaneous Storage. Storage that does not exceed 12 ft (3.66 m) in height and is incidental to another occupancy use group. Such storage shall not constitute more than 10 percent of the building area or 4000 ft2 (372 m2) of the sprinklered area, whichever is greater. Such storage shall not exceed 1000 ft2 (93m2) in one pile or area, and each such pile or area shall be separated from other storage areas by at least 25 ft (7.62 m).
I don't think you can treat this as Misc. storage since you exceed the 1000 SF in one area. I believe that what you are describing is a barrier. 3.9.3.5 Horizontal Barrier. A solid barrier in the horizontal position covering the entire rack, including all flue spaces at certain height increments, to prevent vertical fire spread. While it may be made from 2x4's and OSB it is still a rack. 3.9.3.7* Rack. Any combination of vertical, horizontal, and diagonal members that supports stored materials. Shelving in some rack structures use shelves that can be solid, slatted, or open. Racks can be fixed, portable, or movable. Loading can be either manualusing lift trucks, stacker cranes, or hand placementor automaticusing machine-controlled storage and retrieval systems. While you may not be "Shelve storage" these are solid shelves. 3.9.3.8 Solid Shelving. Solid shelving is fixed in place, slatted, wire mesh or other type of shelves located within racks. The area of a solid shelf is defined by perimeter aisle or flue space on all four sides. Solid shelves having an area equal to or less than 20 ft2 (1.9 m2) shall be defined as open racks. Shelves of wire mesh, slates, or other materials more than 50 percent open and where the flue spaces are maintained shall be defined as open racks. Yes 2007 13.2.1 does allow OHII w/o in-racks for class IV, the only problem I have is do you really meet Misc. storage? Is your building over 29,000 SF? Is there less than 1,000Sf or storage then a 25' separation to 1000SF then a 25' separation to 900 SF? If your 2,900Sf is all one area you're not Misc. storage. Yeah I don't much like no in-racks with solid shelves, especially since the "Rack" can contribute to the fire load. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bob Knight Sent: Tuesday, November 16, 2010 1:57 PM To: [email protected] Subject: Misc Storage I'm looking at an existing building with an existing overhead system. The owner decided to build a mezzanine with rack storage beneath it without a permit or sprinklers, and now after the fact the AHJ is demanding sprinklers. The racks are 2 x 4's with solid wood (OSB) sheathing 4' wide. I've ruled out treating these as shelves since they are over 30" deep. The area is approx.. 2900 sf allowing for this to be treated as miscellaneous storage. The storage height will be 8' +-. The commodity is class IV. All this leads me to Table 13.2.1 which tells me to use OH2 design criteria. The problem that I haven't resolved is the solid shelving. Chapter 13 only mentions in-racks under the section for Group A plastics and does not mention solid shelving at all. Other storage sections spell out the requirements for solid shelving, this one does not. Is it then the intention of chapter 13 to ignore solid shelves with class I - IV commodities? Thanks, Bob Knight Fire Sprinkler Manager Allied General Fire & Security, Inc. 6033 W Franklin Boise, ID 83709 (208) 367-9100 Phone (208) 367-9280 Fax (208) 994-1439 Cell _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
