Attic, under-floor and concealed spaces used for storage of combustible materials shall be protected on the storage side as required for 1-hour fire-resistance-rated construction. Openings shall be protected by assemblies that are self-closing and are of noncombustible construction or solid wood core not less than 13/4 inches (44.5 mm) in thickness. Storage shall not be placed on exposed joists.
- Areas protected by approved automatic sprinkler systems.
- Group R-3 and Group U occupancies.
Outside storage of combustible materials shall not be located within 10 feet (3048 mm) of a lot line.
- The separation distance is allowed to be reduced to 3 feet (914 mm) for storage not exceeding 6 feet (1829 mm) in height.
- The separation distance is allowed to be reduced where the fire code official determines that no hazard to the adjoining property exists.