Section 1020.1/Corridor Fire-Resistance Rating
IBC 1020 establishes when corridors must be fire-resistance rated based on occupancy and sprinkler protection.
Corridors serving as part of the means of egress must have fire- resistance-rated walls as specified in Table 1020.1. In Group H and I occupancies, corridors require a 1-hour rating regardless of sprinkler protection. In Group A, B, E, F, M, S, and U occupancies, corridors require a 1-hour rating without sprinklers but have no rating requirement when the building is fully sprinklered (with exceptions). In Group R occupancies, corridors require a 1-hour rating (0.5-hour if sprinklered). Corridor walls must extend from the floor to the underside of the floor or roof deck above.
Why this section exists
Corridors are the primary exit access paths that occupants use to reach exits. If a fire in an adjacent room breaches the corridor wall, the corridor fills with smoke and heat, blocking the egress path for everyone else on that floor. Fire-rated corridor walls contain the fire long enough for occupants to evacuate through the corridor. Sprinklered buildings receive reduced or eliminated corridor ratings because the sprinkler system controls the fire before it breaches the corridor walls.
What plan reviewers look for
Plan reviewers check the floor plan for corridor wall ratings based on Table 1020.1. They verify the occupancy group and sprinkler status to determine the required rating. They check that corridor walls extend to the structure above (not just to the ceiling grid). They verify that doors in rated corridors have the correct fire-protection rating (typically 20 minutes for 1-hour corridors).
Common violations
Related IBC requirements
Section 1005 covers egress width. Section 1006 covers the number of exits required. Section 706 covers fire barriers (higher-rated walls). Section 716 covers opening protectives (doors in rated walls). Section 1018 covers corridor width requirements.