Minnesota Administrative Rules
Agency 151 - Labor and Industry Department
Chapter 1305 - ADOPTION OF INTERNATIONAL BUILDING CODE
Part 1305.1020 - SECTION 1020, CORRIDORS

Universal Citation: MN Rules 1305.1020

Current through Register Vol. 49, No. 13, September 23, 2024

Subpart 1. IBC Table 1020.1.

IBC Table 1020.1 is amended as follows:

TABLE 1020.1 CORRIDOR FIRE-RESISTANCE RATING

REQUIRED FIRE-RESISTANCE RATING (hours)
OCCUPANCY OCCUPANT LOAD SERVED BY CORRIDOR Without sprinkler system With sprinkler systemc
H-1, H-2, H-3 All Not permitted 1
H-4, H-5 Greater than 30 Not permitted 1
A, B, E, F, M, S U , Greater than 30 1 0
R Greater than 10 1 0.5c/1d
I-2a All Not permitted 0
I-1, I-3 All Not permitted 1b
I-4 All 1 0

a For requirements for occupancies in Group I-2, see Sections 407.2 and 407.3.

b For a reduction in the fire-resistance rating for occupancies in Group I-3, see Section 408.8.

c Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2, where allowed.

d Group R-3 and R-4 buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.3. See Section 903.2.8 for occupancies where automatic sprinkler systems are permitted in accordance with Section 903.3.1.3.

Subp. 2. IBC section 1020.6.

IBC section 1020.6 is amended by modifying the exceptions to read as follows:

Exceptions:

1. Foyers, lobbies, or reception rooms constructed as required for corridors shall not be construed as intervening rooms if the aggregate area of these spaces does not exceed 1,000 square feet per floor.

2. Foyers, lobbies, or reception rooms that are more than 1,000 square feet per floor in aggregate area and other rooms or spaces that are constructed as required for corridors shall not be construed as intervening rooms when the rooms or spaces meet the following:
(a) The spaces are not occupied as dwelling units, sleeping units, incidental uses or hazardous uses.

(b) The rooms, spaces, or corridors are protected by an automatic smoke detection system that initiates alarm notification devices in all normally occupied rooms or spaces that use the corridor for a means of egress.

(c) The room or space is arranged so that it does not obstruct access to the required exits.

(d) Group R occupancies shall be provided with an automatic sprinkler system throughout to allow the use of exception #2.

3. Enclosed elevator lobbies as permitted by Section 1016.2 item 1 shall not be construed as intervening rooms.

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