Insert new Section R324.7 in the Residential Code to read as follows:
Roof access and pathways.
Roof access, pathways and setback requirements shall be provided in accordance with Sections R324.7.1 through R324.7.2. Access and minimum spacing shall be required to provide emergency access to the roof, to provide pathways to specific areas of the roof, provide for smoke ventilation opportunity areas, and to provide emergency egress from the roof.
Exceptions:
Pathways
Not fewer than two roof pathways extending from the lowest edge to the ridge and not less than 36 inches (914 mm) wide, shall be provided on all buildings with solar system installations. Not fewer than one pathway shall be provided on a street or driveway side of the roof. Pathways shall be over areas capable of supporting fire fighters accessing the roof. Pathways shall be located in areas with minimal obstructions such as vent pipes, conduit, or mechanical equipment.
Setback at ridge.
For photovoltaic arrays occupying not more than 66 percent of the plan view total roof area, not less than an 18- inch (457 mm) clear setback is required on both sides of a horizontal ridge, or a 36"- inch (914 mm) clear setback on one side. For photovoltaic arrays occupying more than 66 percent of the plan view total roof area, not less than a 36-inch (914 mm) clear setback is required on both sides of a horizontal ridge.
Setbacks and pathways on buildings with sprinklers. Where an automatic sprinkler system is installed within the dwelling in accordance with NFPA 13D or Section P2904, setbacks and pathways shall not be required.
Emergency escape and rescue opening. Panels and modules installed on dwellings shall not be placed on the portion of a roof that is below an emergency escape and rescue opening. A pathway not less than 36 inches (914mm) wide shall be provided to the emergency escape and rescue opening.
D.C. Mun. Regs. tit. 12, r. 12-B324