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Buildings or portions of buildings that comply with the provisions of this section shall be considered as separated occupancies.
TABLE 508.4
REQUIRED SEPARATION OF OCCUPANCIES (HOURS)f
OCCUPANCY A, E I-1a, I-3, I-4 I-2 Ra F-2, S-2b, U Be, F-1, M,S-1 H-1 H-2 H-3, H-4 H-5
S NS S NS S NS S NS S NS S NS S NS S NS S NS S NS
A, E N N 1 2 2 NP 1 2 N 1 1 2 NP NP 3 4 2 3 2 NP
I-1a, I-3, I-4 1 2 N N 2 NP 1 NP 1 2 1 2 NP NP 3 NP 2 NP 2 NP
I-2 2 NP 2 NP N N 2 NP 2 NP 2 NP NP NP 3 NP 2 NP 2 NP
Ra 1 2 1 NP 2 NP N N 1c 2c 1 2 NP NP 3 NP 2 NP 2 NP
F-2, S-2b, U N 1 1 2 2 NP 1c 2c N N 1 2 NP NP 3 4 2 3 2 NP
Be, F-1, M, S-1 1 2 1 2 2 NP 1 2 1 2 N N NP NP 2 3 1 2 1 NP
H-1 NP NP NP NP NP NP NP NP NP NP NP NP N NP NP NP NP NP NP NP
H-2 3 4 3 NP 3 NP 3 NP 3 4 2 3 NP NP N NP 1 NP 1 NP
H-3, H-4 2 3 2 NP 2 NP 2 NP 2 3 1 2 NP NP 1 NP 1d NP 1 NP
H-5 2 NP 2 NP 2 NP 2 NP 2 NP 1 NP NP NP 1 NP 1 NP N NP
S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
NS = Buildings not equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
N = No separation requirement.
NP = Not Permitted.
  1. See Section 420.
  2. The required separation from areas used only for private or pleasure vehicles shall be reduced by 1 hour but not to less than 1 hour.
  3. See Sections 406.3.2 and 406.6.4.
  4. Separation is not required between occupancies of the same classification.
  5. See Section 422.2 for ambulatory care facilities.
  6. Occupancy separations that serve to define fire area limits established in Chapter 9 for requiring fire protection systems shall also comply with Section 707.3.10 and Table 707.3.10 in accordance with Section 901.7.
508.4.1 Occupancy Classification
Separated occupancies shall be individually classified in accordance with Section 302.1. Each separated space shall comply with this code based on the occupancy classification of that portion of the building. The most restrictive provisions of Chapter 9 that apply to the separate occupancies shall apply to the total nonfire-barrier-separated occupancy areas. Occupancy separations that serve to define fire area limits established in Chapter 9 for requiring a fire protection system shall also comply with Section 901.7.
508.4.2 Allowable Building Area
In each story, the building area shall be such that the sum of the ratios of the actual building area of each separated occupancy divided by the allowable building area of each separated occupancy shall not exceed 1.
508.4.3 Allowable Building Height and Number of Stories
Each separated occupancy shall comply with the building height limitations and story limitations based on the type of construction of the building in accordance with Section 503.1.
Exception: Special provisions of Section 510 shall permit occupancies at building heights and number of stories other than provided in Section 503.1.
508.4.4 Separation
Individual occupancies shall be separated from adjacent occupancies in accordance with Table 508.4.
508.4.4.1 Construction
Required separations shall be fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both, so as to completely separate adjacent occupancies. Mass timber elements serving as fire barriers or horizontal assemblies to separate occupancies in Type IV-B or IV-C construction shall be separated from the interior of the building with an approved thermal barrier consisting of gypsum board that is not less than 1/2 inch (12.7 mm) in thickness or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.

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