IBC Table 307.1(1)—Maximum Allowable Quantity per Control Area of Hazardous Materials Posing a Physical Hazard sets forth maximum allowable quantities for physical hazard materials. All three (3) situations (storage, use-closed, and use-open) are considered. For the specific case of gases, maximum allowable amounts are all listed under storage and use-closed because the definition of “Use” includes all gases.
With two exceptions, any combination of materials or situations listed in this table is allowed in each control area. These two exceptions are (1) as provided by Footnote h, the aggregate of IA, IB, and IC flammable liquids, and (2) as provided by Footnote b, which requires that aggregate quantities of materials in both use and storage must not exceed the allowable quantity for storage.
Specific footnotes to the table provide the following information and liberties: