13-200-190 Increase in one hazard index number.

   When the proposed change in use results in an occupancy class one hazard index number higher than its present occupancy class as defined in Table 13-200-170, the entire building must meet all the requirements of the code for new construction, with the following exceptions:

   (a)   Existing stairways and elevators may remain but shall be upgraded by one of the following alternative methods:

      (1)   Stairs and elevators shall be fully enclosed in accordance with the requirements of Sections 15-8-140 and 15-8-150.

      (2)   Noncombustible doors and assemblies shall be installed in the corridors between exit stairs. Such assemblies need not be rated but shall be constructed, as provided by Section 15-8-140(a).

      (3)   The entire building served by the existing stairs shall be provided with a standard sprinkler system, complying with the requirements of Chapter 15-16.

   (b)   Compliance is not required with all the provisions of Chapter 13-48 for height and area limitations, however, no existing building may be increased in area or height beyond the limitations of Chapter 13-48.

   (c)   Compliance is not required with Sections 15-8-050 and 15-8-100 for existing parapets.

(Prior code § 78.1-19)