CHAPTER 6
TYPES OF CONSTRUCTION
TABLE 601
FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (hours)
| BUILDING ELEMENT | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||
|---|---|---|---|---|---|---|---|---|---|---|
|
|
A | B | Ad | B | Ad | B | HT | Ad | B | |
|
Structural framea Including columns, girders, trusses |
3b | 2b | 1 | 0 | 1 | 0 | HT | 1 | 0 | |
|
Bearing walls Exteriorf Interior |
3 3b |
2 2b |
1 1 |
0 0 |
2 1 |
2 0 |
2 1/HT |
1 1 |
0 0 |
|
|
Nonbearing walls and partitions Exterior Interiore |
See Table 602 See Section 602 |
|||||||||
|
Floor construction Including supporting beams and joists |
2 | 2 | 1 | 0 | 1 | 0 | HT | 1 | 0 | |
|
Roof Construction Including supporting beams and joists |
1 1/2e | 1c | 1c | 0 | 1c | 0 | HT | 1c | 0 | |
For SI: 1 foot = 304.8 mm.
a. The structural frame shall be considered to be the columns and the girders, beams, trusses and spandrels having direct connections to the columns and bracing members designed to carry gravity loads. The members of floor or roof panels which have no connection to the columns shall be considered secondary members and not a part of the structural frame.
b. Roof supports: Fire-resistance ratings of structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.
c. 1. Except in Factory-Industrial (F-I), Hazardous (H), Mercantile (M) and Moderate-Hazard Storage (S-1) occupancies, fire protection of structural members 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.
2. In all occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required.
3. In Type I and Type II construction, fire-retardant-treated wood shall be allowed in buildings not over two stories including girders and trusses as part of the roof construction.
d. An approved automatic sprinkler system in accordance with Section 903.3.1.1 shall be allowed to be substituted for 1-hour fire-resistance-rated construction, pro- vided such system is not otherwise required by other provisions of the code or used for an allowable area increase in accordance with Section 506.3 or an allowable height increase in accordance with Section 504.2. The 1-hour substitution for the fire resistance of exterior walls shall not be permitted.
e. For interior nonbearing partitions in Type IV construction, also see Section 602.4.6.
f. Not less than the fire-resistance rating based on fire separation distance (see Table 602).
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