N.Y.C. Admin. Code § BC 413: Section BC 413: Combustible Storage

413.1 General.

Storage of combustible materials in attics, under-floor spaces, concealed spaces, and below-grade storage rooms shall comply with this section.

413.2 Attic, under-floor and concealed spaces.

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 1 3/4 inch (45 mm) in thickness.

Exception: Neither fire-resistance-rated construction nor opening protectives are required in any of the following locations:

1. Areas protected by approved automatic sprinkler systems.

2. Group R-3 and U occupancies.

413.3 High-piled stock or rack storage.

High-piled stock or rack storage in any occupancy group shall comply with the New York City Fire Code, including the requirement for permit approval.