Classification of Existing Buildings
Classification
(1)Where proposed construction will result in the change of major occupancy of all or part of an existing building to another major occupancy, the building shall be classified as to its,
- (a) construction on the basis of its construction index as provided for in this Part, including Table 11.2.1.1.-A, and (See Note A-11.2.1.1.(1)(a))
- (b) occupancy on the basis of its hazard index as provided for in this Part, including Tables 11.2.1.1.-B to 11.2.1.1.-N. (See Note A-11.2.1.1.(1)(b))
(2)Small or medium sized existing buildings as determined in Tables 11.2.1.1.-B to 11.2.1.1.-N facing multiple streets may be assigned a hazard index credit of 1, which may be subtracted from the hazard index of the proposed major occupancy to reduce the additional upgrading required by Table 11.4.3.4.-A provided,
- (a) the building does not contain a Group B, Division 1, a Group C, or a Group F, Division 1 occupancy, and
- (b) firefighting access complying with Articles 3.2.5.1. to 3.2.5.5. or Subsection 9.10.20. is provided.
(3)The requirements of Articles 2.2.2.3. to 2.2.2.8. and 3.2.2.20. to 3.2.2.93. do not apply to this Part.
(4)For the purpose of this Part, the calculation of the construction index and hazard index for a Group G major occupancy is permitted to be based on a Group F, Division 2 major occupancy.
| C.I. | Type of Construction | Fire-Resistance Rating Floors over Basement | Fire-Resistance Rating Other Floors | Fire-Resistance Rating Roof |
|---|---|---|---|---|
| 8 | Noncombustible | 3 h | 3 h | 1.5 h |
| 7 | Noncombustible | 2 h | 2 h | 1 h |
| 6 | Noncombustible | 1 h | 1 h | 45 min |
| 5 | Noncombustible | 45 min | 45 min | 0 h |
| 4 | Heavy Timber | 45 min | 45 min | 45 min |
| 3 | Combustible | 45 min | 45 min | 45 min |
| 2 | Noncombustible | 45 min | 0 h | 0 h |
| 2 | Combustible | 45 min | 45 min | 0 h |
| 1 | Noncombustible | 30 min | 0 h | 0 h |
| 1 | Combustible | 30 min | 30 min | 0 h |
| 1 | Combustible | 0 h | 30 min | 0 h |
| 1 | Combustible | 0 h | 0 h | 0 h |
(1)The classification of an existing building of multiple occupancy under Article 11.2.1.1. shall be applied according to Articles 3.2.2.5. to 3.2.2.8.
(1)Nothing in this Part relieves an applicant from complying with the requirements of Article 2.2.1.2., 3.1.3.2. or 9.10.9.14.