DESIGN AND NUMBER OF CONTROL AREAS
|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|
|Above grade plane||Higher than 9||5||1||2|
|Below grade plane||1||75||3||1|
|Lower than 2||Not Allowed||Not Allowed||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.
- Separation shall include fire barriers and horizontal assemblies as necessary to provide separation from other portions of the building.
The required fire-resistance rating for fire barriers shall be in accordance with Table 5003.8.3.2. The floor assembly of the control area and the construction supporting the floor of the control area shall have a fire-resistance rating of not less than 2 hours.
Exception: The floor assembly of the control area and the construction supporting the floor of the control area is allowed to be 1-hour fire-resistance rated in buildings of Type IIA, IIIA and VA construction, provided that both of the following conditions exist: