The provisions of Section 601 of IBC are adopted by reference with the following modification:
1. Replace Table 601 as shown:
TABLE 601
FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (HOURS)
FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (HOURS)
BUILDING ELEMENT | TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| |
BUILDING ELEMENT | TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| |
Primary structural frame f | 3 a, b | 2 a, b | 1 b | 0 | 1 b | 0 | HT | 1 b | 0 |
Bearing walls | |||||||||
Exterior e, f | 3 | 2 | 1 | 0 | 2 | 2 | 2 | 1 | 0 |
Interior | 3 a | 2 a | 1 | 0 | 1 | 0 | 1/HT | 1 | 0 |
Nonbearing walls and partitions - Exterior | See Table 602 | ||||||||
Nonbearing walls and partitions - Interior d | 0 | 0 | 0 | 0 | 0 | 0 | Note i | 0 | 0 |
Floor construction and associated secondary members | 2 | 2 | 1 | 0 | 1 g | 0 | HT | 1 g | 0 |
Roof construction and associated secondary members | 1.5 b | 1 b | 1 b | 0 c | 1 b, c, h | 0 | HT | 1 b, c, h | 0 |
For SI: 1 foot = 304.8 mm.
a. Roof supports: Fire-resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.
b. Except in Group F-1, H, M and S-1 occupancies, fire protection of structural members in roof construction shall not be required, including protection of primary structural frame members, roof framing and decking where every part of the roof construction is 20 feet or more above any floor immediately below.
c. In all occupancies, heavy timber complying with Section 2304.11 shall be allowed where a 1-hour or less fire-resistance rating is required.
d. Not less than the fire-resistance rating required by other sections of this code.
e. Not less than the fire-resistance rating based on fire separation distance (see Table 602).
f. Not less than the fire-resistance rating as referenced in Section 704.10.
g. In single-family dwellings, the floor construction over basements and unexcavated spaces below the first story above grade plane is not required to have a fire-resistance rating.
h. In buildings of exclusively Group R-2, R-3, R-4 or R-5 occupancy with no more than four stories above grade plane, the required fire- resistance rating of roof construction and associated secondary members shall be reduced to 30 minutes.
i. See Section 2304.11.2.
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 20)