Cintia, there is no such requirement for roof access (on most homes you have to climb a ladder). I assume you might mean for a condo or apartment type construction. In this case, there are egress requirements, and if you have equipment (like an AC compressor unit) located on the rooftop, then access may be required so you can service it. In general, rooftop access is always a good idea to provide, but I have seen some VERY scary ones that I would not be traversing as an occupant (I wasn't all that thrilled about going up there even being paid to do so).

I have done TONS of new construction inspections through out the Philly area and can give you some advice, pointers, or (hopefully) even be of help to you.

Hope this helps...Marty
Roof Decks located on the roof of a building usually require 2 dedicated independent / remotely located exits / exit stairs. Code section 10(13-160-050) (Roof decks on detached single family garages require only 1 exit stair. In some cases, decks located contiguous to a single dwelling unit may not require 2 independent exits. If the dwelling unit has access to 2 independent exit stairs. This issue is subject to code plan review analysis and interpretation by DCAP )

http://egov.cityofchicago.org/city/webportal/portalContentIt…