sorry about the cross-posting. I just bought a duplex and have access part of my tenant's flat roof via a window. I was considering replacing the window with a door and using the roofs as a deck... maybe even building stairs down to the yard as an alternate exit to my apartment. I'm concerned about the underlying strength of the roof though. I need to make sure it is up to code, especially when I ultimately rent out my apartment to other tenants. I may be able to access the substructure of the roof via my tenants apartment, but I need to know what I should be looking for in terms size and spacing of the crossmembers, etc. Any help or resources would be appreciated!
Thanks, Jon