One minor point regarding this and the discussion Roland and John had
earlier this week. We need to be careful about mixing definitions in
between codes that are written by different code making bodies (ICC vs.
NFPA). This is a perfect example.
The accessory, incidental, separated and unseparated uses and use
designations are building code terms in the IBC used mostly for height and
area limits, triggering sprinkler requirements and rated separation
requirements. I believe they only carry meaning within the IBC and when
specifically referenced by other ICC documents. I don't believe they
necessarily carry the same meaning when applied to NFPA standards. While
the other than R-2 uses might be larger than the accessory or incidental
limits that doesn't mean that automatically triggers 13 in the sprinkler
standards. Think about it, if this were a 3 story building where the whole
first floor was a pool, exercise room, laundry, eating, office, mechanical
space and lounge for the exclusive use of the apartment dwellers the
incidental uses would be 1/3 and well in excess of the IBC limits but no one
would question the use of 13R (with 13 in the other spaces as directed by
13R).
Just because both documents use the same words doesn't mean they have the
same definition or meaning. So I think this was what Roland was trying to
say in an earlier post when he referenced who would be using the classroom,
the residents or any faculty from the college. I can put words in his mouth
because I know he'll spit them out and correct me if I'm wrong.
Code reading can be tricky, thus this wonderful forum. I say just read the
black and white and don't get too fancy. Trying to tie incidental uses
between the IBC (a code written and executed by the ICC) and NFPA 13R (a
standard written and executed by the NFPA) is getting a little too fancy for
me. NFPA and ICC might have settled the lawsuits but that doesn't mean they
are best buds and talk the same language. A common code community separated
by the same language.
Retired(?) AHJ's opinion.
Chris Cahill, P.E.
Fire Protection Engineer
Sentry Fire Protection, Inc.
763-658-4483
763-658-4921 fax
Email: [EMAIL PROTECTED]
Mail: P.O. Box 69
Waverly, MN 55390
Location: 4439 Hwy 12 SW
Waverly, MN 55390
Quoting John Drucker <[EMAIL PROTECTED]>:
> Tom,
>
> A building can have many. Buildings are classified with respect to the
> occupancy (2000 & 2006 IBC Section 302). There are 10 occupancy
> groups. A number of those groups are broken down further, for example
> the Assembly Group (IBC Section 303) is broken down in 5 subgroups,
A1,A2,A3,A4 and A5.
> AHJ's look at the proposed and or actual occupancy of a building and
> classify it accordingly. When an occupancy is not specifically listed
> in Chapter 3 the occupancy is classified to a group most resembling
> the fire safety and relative hazard involved.
>
> A building that contains more then one occupancy or use 2000 IBC 302.3
> /
> 2006 IBC 508 is applied.titled "Mixed Use and Occupancy". The first
> step in the process is to determine if any Accessory Occupancies and
> or Incidental Uses exist. Accessory Occupancies, generally 10% or
> less of the main occupancy and or Incidental Uses, normally spaces
> used for special purposes such as mechanical rooms, storage rooms,
> trash rooms etc. utilize special provisions of the IBC.
>
> Incidental Use areas are classified in accordance with that portion of
> the building in which they are located. Incidental Use Areas require
> fire rated seperation and or suppression in accordance with Table
> 508.2.(2006) 302.1.1 (2000). Accessory Occupancies are addressed in
> IBC 508.3.1(2006) 302.2(2000).
>
> Beyond the Incidental and Accessory provisions building designers
> utilize the Non-Seperated or Seperated Occupancy provisions of the
> IBC. The former utilizes a formula based on individual occupancy
> ratios, the later based on rated fire separations.
>
> Hope that helps,
>
> John Drucker
> Fire Protection Subcode Official
> New Jersey
>
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