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Storage of materials in buildings shall be orderly and stacks shall be stable. Storage of combustible materials shall be separated from heaters or heating devices by distance or shielding so that ignition cannot occur.
315.3.1 Ceiling Clearance
Storage shall be maintained 2 feet (610 mm) or more below the ceiling in nonsprinklered areas of buildings or not less than 18 inches (457 mm) below sprinkler head deflectors in sprinklered areas of buildings.
Exceptions:
  1. The 2-foot (610 mm) ceiling clearance is not required for storage along walls in nonsprinklered areas of buildings.
  2. The 18-inch (457 mm) ceiling clearance is not required for storage along walls in areas of buildings equipped with an automatic sprinkler system in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3.
315.3.2 Means of Egress
Combustible materials shall not be stored in exits or enclosures for stairways and ramps. Combustible materials in the means of egress during construction, demolition, remodeling or alterations shall comply with Section 3312.3.
315.3.3 Equipment Rooms
Combustible material shall not be stored in boiler rooms, mechanical rooms, elevator machine rooms, electrical equipment rooms or in fire command centers as specified in Section 508.1.5.
315.3.4 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 13/4 inches (44.5 mm) in thickness. Storage shall not be placed on exposed joists.
Exceptions:
  1. Areas protected by approved automatic sprinkler systems.
  2. Group R-3 and Group U occupancies.

Related Code Sections

315.3 General Requirements, Storage in Buildings
Storage of materials in buildings shall be orderly and stacks shall be stable. Storage of combustible materials shall be separated from heaters ...
315.3 General Requirements, Storage in Buildings
Storage of materials in buildings shall be orderly and stacks shall be stable. Storage of combustible materials shall be separated from heaters ...