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3806.2.1 Percentage of Maximum Allowable Quantities Per Control Area
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The percentage of maximum allowable quantities per control area of hazardous materials shall be in accordance with Table 3806.2.1.
DESIGN AND NUMBER OF CONTROL AREAS IN EXISTING SPRINKLERED LABORATORIES
| FLOOR LEVEL | PERCENTAGE OF THE MAXIMUM ALLOWABLE QUANTITY PER CONTROL AREAa | NUMBER OF CONTROL AREAS PER FLOOR | FIRE-RESISTANCE RATING FOR FIRE BARRIERS IN HOURSb, d | |
| Above grade plane | 21+ 11—20 7—10 4—6 3 1—2 | 5 10 25 50 75 100 | 1 1 2 2 3 4 | 2c 2c 2c 2c 1 1 |
| Below grade plane | 1 2 Lower than 2 | 100 75 Not Allowed | 3 2 Not Allowed | 1 1 Not Allowed |
- Percentages shall be of the maximum allowable quantity per control area shown in Tables 5003.1.1(1) and 5003.1.1(2), with all increases allowed in the footnotes to those tables.
- Fire barriers shall include walls, floors and ceilings necessary to provide separation from other portions of the building.
- Vertical fire barriers separating control areas from other spaces on the same floor are permitted to be 1-hour fire-resistance rated.
- See Section 414.2.4 of the International Building Code for additional requirements.