Thom,
I think Brian also needs to look at:
14.2.1 Protection for Class I through Class IV commodities in the
following configurations shall be provided in accordance with this chapter:
(4) Back-to-back shelf storage up to 15 ft (4.6 m) in height
And very carefully, at:
14.2.2 The area and density for the hydraulically remote area and the
water supply shall be determined as specified in 14.2.3 for storage up
to and including 12 ft (3.7 m) and 14.2.4 for storage over 12 ft (3.7 m).
And then to:
14.2.3 Protection Criteria for Palletized, Solid Piled, Bin Box, Shelf
Storage, or Back-to-Back Shelf Storage of Class I Through Class IV
Commodities Stored Up to 12 ft (3.7 m) in Height.
14.2.3.1 The protection criteria for storage up to and including 12 ft
(3.7 m) shall be the same as for miscellaneous storage selected from
Chapter 13.
14.2.3.2 The protection criteria in Chapter 13 shall be acceptable for
storage of Class I to Class IV commodities up to and including 12 ft
(3.7 m) in height (see Table 13.2.1).
Following that progression, I would think it's no longer relevant if the
area is < 2,900 ft2 or meets the other definitions of "miscellaneous
storage", as -13 directs the density to be per the section on misc.
storage for that type of storage for Class I-IV up to 12'-0", which did
meet what he mentioned.
If the method of storage is defined as "rack, with solid shelves", then
I think the following would apply:
16.2.1.2 Protection Criteria for Rack Storage of Class I Through IV
Commodities Stored Up to 12 ft (3.7 m) in Height.
16.2.1.2.1 The protection criteria for storage up to and including 12 ft
(3.7 m) shall be the same as miscellaneous storage, selected from
Chapter 13.
I think Brian could indeed follow chapter -13, based on the above, and
still be in conformance with the standard.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[email protected] <mailto:[email protected]>e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com>website
On 11/16/2010 3:32 PM, Thom wrote:
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 manual—using lift trucks, stacker cranes, or hand
placement—or automatic—using 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
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