1. 1009.13 "Stairway to Roof" requires a stairway to the roof, using stairs or alternating tread device. 1009.13.1 "Roof Access" says the stairway to the roof will have a penthouse. Exception: In buildings without occupied roofs, access shall be permitted by hatch.
Question: Is the roof hatch exception applied to 1009.13 Stairway to roof, or only to 1009.13.1 Roof access? If a stairway to roof is required, then you've got a penthouse, but if the stairway is not required, then you can use a roof hatch?
Along a similar note reqarding the podium construction described in 509: Is the horizontal separation between the first story and the three above mean that I can treat it as a three story building and then "Stairway to Roof" does not apply? My read it that 509 only applies to number of stories, and Stairway to Roof applies to total number of stories above grade plane, regardless of podium construction.