11.4.2.

(1) The performance level of an existing building is reduced where after proposed construction in all or part of an existing building,

(a) the major occupancy will change to a different major occupancy,

(b) the occupant load will increase by more than 15%, or

(c) the live load will increase due to change in use within the same major occupancy,

and the existing structural floor and roof framing systems and their supporting members after the construction are not adequate to support the proposed dead loads and live loads.

(1) Except as required in Sentences 11.4.2.5.(2) and (3), the performance level of an existing building is reduced where proposed construction will increase the occupant load of an existing building by more than 15%.

(2) The performance level of an existing building is reduced where proposed construction will increase the occupant load by 15% or less and the new occupant load will be more than 15% above the occupant load for which a fire alarm system is required under Sentence 3.2.4.1.(2).

(3) The performance level of an existing building is reduced where proposed construction will increase the occupant load by 15% or less and the new occupant load will be more than 15% above the existing exit capacity as required under Article 3.4.3.4.

(1) Except as required in Sentence 11.4.2.5.(4), the performance level of an existing building is reduced where proposed construction will result in,

(a) the change of the major occupancy of all or part of an existing building to another major occupancy of a greater hazard index,

(b) the conversion of a suite of a Group C major occupancy into more than one suite of Group C major occupancy,

(c) a suite or part of a suite of a Group A, Division 2 or a Group A, Division 4 major occupancy is converted to a gaming premises,

(d) the change of a farm building or part of a farm building to a major occupancy,

(e) the change of a building or part of a building is to a post-disaster building, or

(f) the change in use of a building or part of a building where the previous major occupancy of the building or part of the building cannot be determined.

(2) For the purpose of this Article and Sentences 11.4.2.1.(1) and 11.4.2.5.(4), the change of use set out in Clauses (1)(b) to (e) shall also be deemed to constitute a change in major occupancy.

(3) The performance level of an existing building is reduced where the early warning and evacuation systems requirements of other Parts for the proposed major occupancy exceed those of the existing building.

(4) The performance level of an existing building is reduced where the proposed major occupancy in the building is not separated from the adjoining major occupancies by fire separations having fire-resistance ratings conforming to Tables 3.1.3.1. and 11.4.3.4.B.v1

(5) The performance level of an existing building is reduced where the occupancy of all or part of an existing building of combustible construction is changed to a new major occupancy that would require the building, if it were a new building, to be constructed of noncombustible construction.

(1) The performance level of an existing building is reduced where the existing building is extended or subject to material alteration or repair, and plumbing in the existing building is adversely affected by the extension, alteration or repair.

(1) The performance level of an existing building is reduced where the existing building is extended or subject to material alteration or repair and a sewage system serving the existing building is adversely affected by the extension, alteration or repair of the existing building.

(2) Except as provided in Sentence (3), the performance level of an existing building is reduced where proposed construction will increase the occupant load of an existing building, and the new occupant load will result in the total daily design sanitary sewage flow of the building, calculated in accordance with Article 8.2.1.3., exceeding the capacity of any component of a sewage system serving the building.

(3) The performance level of an existing dwelling unit is reduced where proposed construction that,

(a) increases the number of bedrooms in the dwelling unit,

(b) exceeds 15% of the finished area of the dwelling unit, or

(c) adds new plumbing fixtures to the dwelling unit,

will result in the total daily design sanitary sewage flow of the dwelling unit, calculated in accordance with Article 8.2.1.3., exceeding the capacity of any component of a sewage system serving the dwelling unit.

(4) The performance level of an existing building is reduced where proposed construction will result in the change of a major occupancy of all or part of the existing building to another major occupancy and,

(a) the total daily design sanitary sewage flow of the proposed major occupancy, calculated in accordance with Article 8.2.1.3., exceeds the capacity of any component of a sewage system serving the building, or

(b) the type or amount of sanitary sewage which will, under the proposed major occupancy, be discharged to a sewage system serving the building, is prohibited by Article 8.1.3.1.v1