Section 5601.1/Hazardous Materials General Provisions
IFC Chapter 56 covers maximum allowable quantities, control areas, and Group H occupancy triggers for hazardous materials.
Buildings that store, handle, or use hazardous materials must comply with the maximum allowable quantity (MAQ) tables. If the quantity of a hazardous material exceeds the MAQ per control area, the building or portion thereof is classified as a Group H (High Hazard) occupancy. Control areas are spaces within a building that are separated by fire barriers to limit the quantity of hazardous materials per area. A building can have multiple control areas to increase the total allowable quantity without triggering Group H classification. Each control area must be separated from adjacent areas by fire barriers rated per Table 5003.8.3.2.
Why this section exists
Hazardous materials (flammable liquids, corrosives, oxidizers, toxic substances) pose risks beyond normal building contents. Fires involving these materials are more intense, spread faster, and may produce toxic fumes. The MAQ and control area concept allows buildings to contain limited quantities of hazardous materials in non-H occupancies (laboratories, manufacturing areas, maintenance rooms) while ensuring that larger quantities trigger the more stringent Group H requirements (explosion venting, enhanced sprinklers, spill control).
What plan reviewers look for
Plan reviewers check the hazardous materials inventory against the MAQ tables. They verify the number and location of control areas on the floor plan with the required fire barrier separations. They check that each control area stays within the MAQ for each material type. They verify that the overall building occupancy classification accounts for hazardous materials.