780 CMR 601 - GENERAL
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 | |
| Primary structural
frameg (see Section 202) |
3a | 2a | 1 | 0 | 1 | 0 | HT | 1 | 0 |
| Bearing Walls | |||||||||
| Exteriorf,g | 3 | 2 | 1 | 0 | 2 | 2 | 2 | 1 | 0 |
| Interior | 3a | 2a | 1 | 0 | 1 | 0 | 1/HT | 1 | 0 |
| Nonbearing walls and partitions Exterior |
See Table 602 | ||||||||
| Nonbearing walls and partitions Interiore |
0 | 0 | 0 | 0 | 0 | 0 | See Section 602.4.6 | 0 | 0 |
| Floor construction and secondary members (see Section 202) |
2 | 2 | 1 | 0 | 1 | 0 | HT | 1 | 0 |
| Roof construction and secondary members (see Section 202) |
11/2b | 1b,c | 1b,c | 0c | 1b,c | 0 | 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. Except in Group F-1, H, M and 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. c. In all occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required. 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, provided 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. Not less than the fire-resistance rating required by other sections of this code. f. Not less than the fire-resistance rating based on fire separation distance (see Table 602). g. Not less than the fire-resistance rating as referenced in Section 704.10 |
Notes
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