2013 California Standards for Accessible Design Pocket Guide

1007.6.2 Separation. Each area of refuge shall be separated from the remainder of the story by a smoke barrier complying with Section 709 or a horizontal exit complying with Section 1025. Each area of refuge shall be designed to minimize the intrusion of smoke.

Exception:  Areas of refuge located within an enclosure for exit access stairways or interior exit stairways.