Definition of Roof

Robert, I believe that a roof is defined as a surface that covers usable interior space. So, for example, a balcony is not a roof, but it sounds like this terrace is a roof.

What about a terrace that is just partially covered by the next floor? One of the projects we are currently working on has this very interesting design: like stacked floors with some with vegetated terraces/balconies, and the next floor overhung partially or completely or opened like a rooftop terrace. According to your experience, how shall we treat for SSc7.2 the terraces, that are partially covered by the next floor? I am thinking of counting as roof, only the visible part from bird-eye. Also, a big issue is the open space calcs in SSc5.2: can we included the vegetated balconies, even though they are covered by the next floor. Any thoughts and considerations would be highly appreciated. Thanks in advance.

In regards to the roof area for SS 7.2 I have looked through all the CIRs and couldn't find a ruling that clarifies this. The general rule you will have to go by is "roof is what covers the building", this excludes a roof covering unconditioned spaces, or spaces open to the outside. So you will have to count your terrace even if it's over shadowed by an overhung. It does on the other hand side make sense to exclude areas, which are in the shade, similar to SS 7.1 Non-Roof. If you want to do that, you should probably submit a CIR to make sure it's ok for the reviewer. For SS c5.2 you can included the balconies, if you also comply with SS c2 and the balcony, terrace or roof top needs to accessible for building occupants. So if the access is restricted or it's a private balcony than it doesn't count.