Fire rated doors are a required part of fire protection systems in commercial buildings, multi-unit residential properties, and institutional facilities. They contain fire and smoke within a compartment for a specific duration, giving occupants time to evacuate and limiting property damage. Property owners who are responsible for these buildings need to understand how fire rated doors work, where they are required, and what their maintenance obligations are.
What Fire Rated Doors Do
A fire rated door assembly is designed to remain intact and functional during a fire for a specified period. Ratings are measured in time increments: 20 minutes, 45 minutes, 60 minutes, 90 minutes, and 3 hours. The rating indicates how long the assembly will resist fire penetration and limit heat transfer under standardized test conditions.
The assembly includes the door slab, the frame, the hinges, the closer, the latching hardware, and any gaskets or intumescent seals. Every component must carry a fire rating that matches or exceeds the rating of the door. A 60-minute rated door installed with non-rated hinges is not a 60-minute assembly. It is non-compliant.
Fire rated doors are required at openings in fire-rated walls and partitions. These walls create compartments within a building that slow the spread of fire. The door is the weakest point in that compartment, and its rating must maintain the integrity of the wall it sits in.
Where Fire Rated Doors Are Required
Building codes specify fire rated door requirements based on occupancy type, building size, and wall construction. Common locations that require fire rated doors include stairwell entrances and exits, corridor walls that separate tenant spaces, walls between different occupancy types, mechanical and electrical rooms, elevator lobbies, and storage rooms in commercial and institutional buildings.
The specific rating required at each location depends on the fire resistance rating of the wall. A two-hour rated wall typically requires a 90-minute rated door. A one-hour rated wall typically requires a 45-minute rated door. The building code for your province and municipality governs these requirements.
Property Owner Responsibilities
Building owners and property managers are responsible for the ongoing condition and compliance of fire rated doors in their buildings. This responsibility does not end after installation.
Fire rated doors must be inspected annually in most jurisdictions. NFPA 80, the Standard for Fire Doors and Other Opening Protectives, establishes the inspection criteria used across North America. Inspections evaluate the door, frame, hardware, glazing, labeling, clearances, and operation.
Common inspection deficiencies include closers that do not fully close and latch the door, missing or painted-over fire rating labels, non-rated hardware installed as a replacement, gaps between the door and frame that exceed code allowances, doors propped open without approved hold-open devices, and damaged or missing gaskets and seals.
Deficiencies found during an inspection must be corrected promptly. Fire rated door deficiencies are code violations that can result in failed building inspections, fines, increased insurance premiums, and liability exposure in the event of a fire.
Common Maintenance Issues
Fire rated doors degrade over time from daily use and building operations. The most common maintenance issues affect the closer, the latch, and the gaskets.
Closers lose fluid, go out of adjustment, and eventually fail. A fire rated door that does not close and latch on its own is non-compliant. Closers should be inspected and adjusted regularly and replaced when they no longer function correctly.
Latching hardware must engage the strike without manual assistance. If the latch doesn’t catch the strike plate when the door closes, the door will not contain fire as intended. Strike alignment, latch projection, and closer force all affect latching.
Intumescent seals and gaskets swell in the presence of heat to seal gaps between the door and frame. Damaged, missing, or painted-over gaskets reduce the assembly’s ability to block smoke and fire. Replace gaskets with products that are listed for the specific door assembly.
What Property Owners Should Not Do
Do not prop fire rated doors open with wedges, blocks, or other unapproved devices. If a fire rated door needs to remain open for operational purposes, install an approved electromagnetic hold-open device connected to the fire alarm system. These devices release the door automatically when the fire alarm activates.
Do not replace fire rated hardware with standard hardware. If a closer, hinge, or lockset needs replacement, the new component must be listed for use in fire rated door assemblies.
Do not modify, cut, or drill into a fire rated door without consulting the manufacturer. Modifications can void the fire rating and create a code violation.
Do not paint over fire rating labels. Labels are the only way to verify the rating of a door and frame. If a label is missing or illegible, the assembly may need to be re-evaluated or replaced.
Insurance & Liability Implications
Insurance companies evaluate fire protection systems during underwriting and claims investigations. Fire rated doors that are not maintained, inspected, or code-compliant can affect coverage and claim outcomes.
A building fire involving non-compliant fire doors may result in denied claims, increased premiums, or litigation. Maintaining fire door compliance protects both the building and the owner.
Regular inspection records, maintenance logs, and corrective action documentation demonstrate due diligence and support your position in the event of a claim or audit.