Chapter 6 — TYPES OF CONSTRUCTION
601 General — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Building Code (Title 24, Part 2) § 601 · Effective January 1, 2026 · Official source: Building Standards Commission
TABLE 601—FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (HOURS)
| BUILDING ELEMENT | TYPE I | TYPE I | TYPE II | TYPE II | TYPE III | TYPE III | TYPE IV | TYPE IV | TYPE IV | TYPE IV | TYPE V | TYPE V |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BUILDING ELEMENT | A | B | A | B | A | B | A | B | C | HT | A | B |
| Primary structural framef (see Section 202) |
3a, b | 2a, b, c | 1b, c | 0c | 1b, c | 0 | 3a | 2a | 2a | HT | 1b, c | 0 |
| Bearing walls | ||||||||||||
| Exteriore, f | 3 | 2 | 1 | 0 | 2 | 2 | 3 | 2 | 2 | 2 | 1 | 0 |
| Interior | 3a | 2a | 1 | 0 | 1 | 0 | 3 | 2 | 2 | 1/HTg | 1 | 0 |
| Nonbearing walls and partitions Exterior |
See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 | See Table 705.5 |
| Nonbearing walls and partitions Interiord |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | See Section 2304.11.2 |
0 | 0 |
| Floor construction and associated secondary structural members (see Section 202) |
2 | 2 | 1 | 0 | 1 | 0 | 2 | 2 | 2 | HT | 1 | 0 |
| Roof construction and associated secondary structural members (see Section 202) |
11/2 b |
1b, c | 1b, c | 0c | 1b, c | 0 | 11/2 | 1 | 1 | HT | 1b, c | 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._ 1._ Except in Group_A, E,_ F-1, H,I, L,M, R-1, R-2, R-2.1 and S-1 occupancies,high-rise buildings, and other applications listed in Section 1.11 regulated by the Office of the State Fire
_Marshal, _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 or mezzanine immediately below. Fire-retardant-treated wood members shall be
allowed to be used for such unprotected members.
2. For Group A, E, I, L, R-1, R-2 and R-2.1 occupancies, high-rise buildings, and other applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, fire protec-
tion of members other than the primary structural frame shall not be required, including protection of roof framing and decking where every part of the roof construction is 20
feet or more above any floor immediately below. Fire-retardant-treated wood members shall be allowed to be used for such unprotected members.
3. One-story portions of Group A and E assembly occupancies the roof-framing system of Type II A or Type III A construction may be of unprotected construction when such roof-
framing system is open to the assembly area and does not contain concealed spaces.
c. In all occupancies, heavy timber complying with Section 2304.11 shall be allowed for roof construction, including primary structural frame members, 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 705.5).
f. Not less than the fire-resistance rating as referenced in Section 704.9.
g. Heavy timber bearing walls supporting more than two floors or more than a floor and a roof shall have a fire-resistance rating of not less than 1 hour.
601.1 Scope.¶
The provisions of this chapter shall control the classification of buildings as to type of construction.
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