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20.5.1
General storage arrangements defined in this section shall be used to select the appropriate protection criteria in Chapters 21 through 25.
20.5.1.1
Other storage arrangements not covered by this section shall be considered outside the scope of this standard.
20.5.2 Movable Racks
Rack storage in movable racks shall be protected in the same manner as multiple-row racks.
20.5.3* Rack Storage
20.5.3.1 Shelving
20.5.3.1.1
Shelving material that is less than 50 percent open, or placement of loads that block openings that would otherwise serve as the required flue spaces, greater than 20 ft2 (1.9 m2) in area shall be treated as solid shelf racks.
20.5.3.1.2
Where multiple-row racks of any height have no longitudinal flue or where double-row racks with storage up 25 ft (7.6 m) in height have no longitudinal flue, the situation shall not be considered solid shelves where transverse flues exist at maximum 5 ft (1.5 m) intervals, and additional in-rack sprinklers shall not be required in accordance with 25.6.3.1 and 25.6.3.2.
20.5.3.2 Aisles
20.5.3.2.1
Aisles required by Chapters 21 through 25 shall not be obstructed unless Chapters 21 through 25 include specific guidance allowing obstructions over the aisle.
20.5.3.3 Flues
20.5.3.3.1 Longitudinal Flue Space
20.5.3.3.1.1
For Class I through IV and Group A plastic in double-row and multiple-row open racks, a longitudinal flue space shall not be required for storage up to and including 25 ft (7.6 m). (See Section C.13.)
20.5.3.3.1.2
For Class I through IV and Group A plastic nominal 6 in. (152.4 mm) longitudinal flue spaces shall be provided in double-row racks for storage over 25 ft (7.6 m).
20.5.3.3.2 Transverse Flue Space
20.5.3.3.2.1
Nominal 6 in. (150 mm) transverse flue spaces between loads and at rack uprights shall be maintained in single-row, double-row, and multiple-row racks.
20.5.3.3.2.2
Random variations in the width of flue spaces or in their vertical alignment shall be permitted.
20.5.4 Rubber Tires
20.5.4.1 Water Supplies
Total water supplies shall be capable of providing flow for automatic sprinklers, hose streams, and foam systems (if provided) for the duration required in Table 20.12.2.6.
20.5.5 Roll Paper
20.5.5.1* Protection Criteria for Roll Paper Storage
20.5.5.2
Wet pipe systems shall be used in tissue storage areas.
20.5.5.2.1
The water supply design shall include the demand of the automatic sprinkler system plus the hose stream allowance plus, where provided, the high-expansion foam system for the duration specified in Table 20.12.2.6.
20.5.5.3
Horizontal storage of heavyweight or mediumweight paper shall be protected as a closed array.
20.5.5.4
Mediumweight paper shall be permitted to be protected as heavyweight paper where wrapped completely on the sides and both ends, or where wrapped on the sides only with steel bands. Wrapping material shall be either a single layer of heavyweight paper with a basis weight of 40 lb (18.1 kg) or two layers of heavyweight paper with a basis weight of less than 40 lb (18.1 kg).
20.5.5.5
Lightweight paper or tissue paper shall be permitted to be protected as mediumweight paper where wrapped completely on the sides and both ends, or where wrapped on the sides only with steel bands. Wrapping material shall be either a single layer of heavyweight paper with a basis weight of 40 lb (18.1 kg) or two layers of heavyweight paper with a basis weight of less than 40 lb (18.1 kg).
20.5.5.6
For purposes of sprinkler system design criteria, lightweight class paper shall be protected as tissue.
20.5.6 Plastic Motor Vehicle Components
Group A plastic automotive components and associated packaging material consisting of exposed, expanded Group A plastic dunnage, instrument panels, and plastic bumper fascia shall be permitted to be protected as defined in Chapter 23.
20.5.6.1
Automotive components covered in this section shall not include the storage of air bags, tires, and seats on portable racks.

Related Code Sections

20.5 General Requirements for Storage, Storage Arrangement
General storage arrangements defined in this section shall be used to select the appropriate protection criteria in Chapters 21 through 25 ...
20.5.3.2 General Requirements for Storage, Aisles
Aisles required by Chapters 21 through 25 shall not be obstructed unless Chapters 21 through 25 include specific guidance allowing obstructions over ...