901.9.5.3 Additional requirements for enlargements of buildings with existing standpipe systems.
BC § 901.9.5.3
Where the alteration involves the addition of stories to a building with an existing standpipe system, and one or more stair shafts are not currently equipped with standpipes, standpipes shall be provided to all stair shafts in accordance with this chapter. Exception. Additional standpipes are not required where: 1. The alteration involves the addition of only one story; 2. Existing standpipes in existing stair shafts are extended in accordance with this chapter; 3. Standpipe hose connections are provided in compliance with Section 905.4, Item 6; and 4. The demand on the standpipe system, including any additional demand, with respect to flow and pressure does not exceed the capacity of the existing approved system.
