What are the requirements for the number of sprinkler risers in buildings that exceed 420 feet in height as stated in the 2018 International Building Code?

Buildings exceeding 420 feet in height must have each sprinkler system zone supplied by at least two risers, with each riser serving sprinklers on alternate floors.

In buildings that are more than 420 feet in height, the 2018 International Building Code requires that each sprinkler system zone be supplied by at least two risers. These risers must ensure that sprinklers on alternate floors are served by different risers. If more than two risers are used for a zone, it is important that sprinklers on adjacent floors are not supplied by the same riser, ensuring redundancy and reliability in the sprinkler system.