Kansas Egress Code Explained: Applying IBC Chapter 10 for Corridors, Exits & Travel Distance

Because Kansas does not have a statewide building or fire code, all commercial egress requirements are determined by the codes adopted at the local level (city or county). Most major jurisdictions in Kansas, including Topeka, Wichita, and the cities within Johnson County, have adopted a version of the International Building Code (IBC) and International Fire Code (IFC), typically the 2018 editions.

For architects, engineers, and contractors, this means understanding the model codes is essential, but verifying local amendments is a critical first step for any project.

Key egress requirements based on the commonly adopted 2018 IBC include:

• Fire-Rated Corridors: The requirement for a fire-rated corridor is based on the building’s occupancy type, occupant load, and whether the building is equipped with an automatic sprinkler system. Per IBC Table 1020.1, a Group M (Mercantile/Retail) occupancy with an occupant load over 30 requires a 1-hour rated corridor, though a significant exception often removes this requirement in fully sprinklered buildings.

• Egress Travel Distance: The maximum allowable distance an occupant can travel to reach an exit is dictated by IBC Table 1017.2. For a typical retail space (Group M), the maximum travel distance is 400 feet if the building is fully sprinklered and 200 feet if it is not.

• Emergency Lighting & Exit Signs: The IBC, IFC, and NFPA 101 all mandate emergency illumination and exit signage for most commercial occupancies. The critical requirement, enforced by fire marshals across Kansas, is that all required emergency lights and exit signs must be connected to a backup power source (battery, generator, etc.) capable of providing continuous power for at least 90 minutes upon failure of the normal power supply.

Why Egress Codes Matter in Kansas

Means of egress is one of the most fundamental life safety concepts in building design. It provides a continuous and unobstructed path of vertical and horizontal egress travel from any occupied portion of a building to a public way. In Kansas, the lack of a statewide code places a significant responsibility on design professionals to identify and comply with the specific codes adopted by the local Authority Having Jurisdiction (AHJ).

This "home rule" approach has several implications for projects:

• Verification is Key: Never assume the code version. A project in Topeka might be under the 2018 IBC, while a neighboring county could still be on the 2012 or have adopted the 2021 version.

• Coordination is Critical: The building department reviews plans against the adopted IBC for design and construction, while the local fire marshal often uses the IFC and NFPA 101 (Life Safety Code) for plan review and ongoing operational inspections. These codes are designed to work together, but occasional differences in interpretation or emphasis can arise.

• Common Pitfalls: Misunderstanding local amendments, miscalculating occupant loads, incorrectly measuring travel distances, and failing to coordinate emergency power systems are common sources of plan review rejection and inspection delays in Kansas jurisdictions. Early engagement with both the building and fire departments is a best practice.

For a large-scale tenant improvement in an existing retail building in Topeka, which code sections in their adopted IBC and fire code dictate the requirements for fire-rated corridors, smoke barriers, and the maximum allowable egress travel distances given the existing building's construction type and sprinkler status?

In Topeka, which has adopted the 2018 International Building Code (IBC) and 2018 International Fire Code (IFC), these requirements are primarily governed by IBC Chapter 10 (Means of Egress) and Chapter 7 (Fire and Smoke Protection Features). Because the project is an alteration to an existing building, the 2018 International Existing Building Code (IEBC) also applies.

The specific sections dictating your requirements are:

Fire-Rated Corridors

The requirement for fire-resistance-rated corridors is found in IBC 2018 §1020.

• Primary Rule: IBC Table 1020.1 (Corridor Fire-Resistance Rating) dictates the required rating based on occupancy group and occupant load. For a Group M (Mercantile/Retail) occupancy, a corridor serving an occupant load greater than 30 requires a 1-hour fire-resistance rating.

• Critical Exception for Sprinklered Buildings: IBC §1020.1, Exception 2 is highly relevant for retail tenant improvements. It states that a fire-resistance rating is not required for corridors in a Group M occupancy where the building is equipped throughout with an automatic sprinkler system in accordance with NFPA 13. Most large-scale retail buildings are sprinklered, making this exception frequently applicable.

Smoke Barriers

Smoke barriers are detailed in IBC 2018 §709.

• Function: A smoke barrier is a continuous membrane designed to restrict the movement of smoke. They are typically required to have a fire-resistance rating of at least 1 hour.

• Applicability: In a standard Group M retail tenant improvement, smoke barriers are not typically required unless specific conditions exist, such as separating different occupancies or as part of a smoke control system. They are more common in occupancies like Group I (Institutional) or within covered mall buildings as specified in IBC §402.4.2.2. For a typical retail TI, you will be dealing with fire partitions and fire barriers more often than smoke barriers.

Egress Travel Distances

The maximum allowable travel distance is specified in IBC 2018 §1017.

• Definition: Exit access travel distance is the distance an occupant must travel from the most remote point in an occupied space to the entrance of an exit (IBC §1017.1).

• Maximum Limits: IBC Table 1017.2 (Exit Access Travel Distances) provides the limits. For a Group M occupancy:

  • With an automatic sprinkler system (NFPA 13): 400 feet

  • Without a sprinkler system: 200 feet

• Measurement: The distance is measured along the natural and unobstructed path of egress travel, starting 1 foot from the most remote point and ending at the center of the doorway to the exit (IBC §1017.3).

Considerations for Existing Buildings (IEBC)

Since this is a tenant improvement, the 2018 IEBC (adopted by Topeka) is critical. Chapter 7 (Alterations—Level 2) applies to this scope of work.

• IEBC §705 (Means of Egress): This section requires the means of egress for the altered area to comply with the requirements of IBC Chapter 10 for new construction. However, it also clarifies that the existing building is not required to be brought into full compliance unless the alterations create a hazardous condition. The fundamental rule is that the alteration cannot reduce the level of life safety that already exists.

What are the specific requirements for emergency lighting and exit signage illumination (e.g., battery backup duration) as enforced by the fire marshal in Johnson County?

In Johnson County, the specific requirements are enforced by the fire marshal of the local jurisdiction (e.g., Overland Park, Olathe, Lenexa) based on their adopted codes, which are typically the 2018 IBC, 2018 IFC, and NFPA 101, Life Safety Code. On this critical life safety topic, the codes are consistent: all required emergency lighting and exit signs must have a backup power source that provides illumination for a minimum duration of 90 minutes.

Here is a breakdown of the governing code sections:

Emergency Lighting

• Requirement: Emergency illumination is required in the means of egress for nearly all commercial occupancies upon failure of normal power. The system must provide an initial average of 1.0 footcandle (11 lux) of illumination at the floor level (IBC §1008.2, IFC §1008.2).

• Power Source: The power supply for emergency illumination must provide power automatically upon interruption of normal power (IBC §1008.2.1).

• Duration: The system must be capable of powering the emergency lighting for a duration of not less than 90 minutes (IBC §1008.2.1).

Exit Signage Illumination

• Requirement: Exit signs must be illuminated at all times the building is occupied (IBC §1013.1).

• Power Source: Exit signs must be connected to both a normal and an emergency power source. The emergency power source must provide power automatically if the normal power fails (IBC §1013.6.3, NFPA 101 §7.10.4).

• Duration: The emergency power system for exit signs must also provide illumination for a duration of not less than 90 minutes (IBC §1013.6.3).

Fire Marshal Enforcement in Johnson County

The fire marshal's office in any Johnson County jurisdiction will verify compliance through both plan review and field inspections.

1. Plan Review: Electrical plans must clearly show the location of all exit signs and emergency lighting fixtures, and specify that they are connected to an emergency circuit or have integral battery backups.

2. Field Inspection: During the final inspection, the fire marshal will typically perform a "push-to-test" on a sample of battery-backup fixtures to ensure they activate. They will also shut off normal power to the circuits to verify that all emergency lights and exit signs illuminate as required.

3. Ongoing Maintenance: The IFC and NFPA 101 require periodic testing and maintenance of these systems. IFC §1031.7 and NFPA 101 §7.9.3 require a 30-second test monthly and a full 90-minute discharge test annually. Records of these tests must be maintained for inspection by the fire marshal.

Local Code Adoption in Major Kansas Jurisdictions

Since Kansas operates on a "home rule" basis for code adoption, designers must verify the codes in effect for each specific project location. The table below summarizes the adopted codes for several of Kansas's largest cities as of late 2023/early 2024. Always confirm with the local building department before starting a project.

Common Egress Plan Review Mistakes in Kansas

Plan reviewers and fire marshals in Kansas frequently encounter the same egress-related errors on construction documents. Avoiding these common mistakes can significantly speed up the permitting process.

• Incorrect Occupant Load Calculation: Using the wrong occupant load factor from IBC Table 1004.5 or failing to account for concentrated furniture layouts. The occupant load drives requirements for exit number, exit width, and corridor ratings.

• Improper Travel Distance Measurement: Drawing the travel distance path through furniture, fixtures, or walls instead of along the clear, natural walking path.

• Forgetting Common Path of Egress Travel: The common path of egress travel (IBC §1006.2.1) is the portion of the exit access travel distance measured before two separate and distinct paths to two different exits are available. This is often more restrictive than the total travel distance and is a common point of confusion.

• Missing Exit Signs or Emergency Lights: Failing to place exit signs at all required exit doors or to show adequate emergency lighting coverage along the entire path of egress, including corners and stairwells.

• Door Swing Encroachment: Specifying doors that swing into a required corridor or landing and reduce the clear width by more than the permitted amount (typically half the required width) (IBC §1005.7.1).

• Ignoring Existing Building Code Nuances: Forgetting that alterations in existing buildings must comply with the IEBC, which has specific triggers for when the entire building's egress system must be upgraded.

Coordination Between the IBC, IFC, and NFPA 101

For projects in Kansas, understanding the relationship between these three key documents is crucial for a smooth plan review and inspection process.

• International Building Code (IBC): This is the primary code used during the design and construction phase. It dictates how to build the means of egress system, including corridor ratings, stair dimensions, exit capacity, and door hardware. It is typically enforced by the city or county building department.

• International Fire Code (IFC): This code governs the operational and maintenance aspects of a building once it is occupied. It contains overlapping egress requirements with the IBC (e.g., Chapters 10 in both are nearly identical) but adds rules for egress path maintenance, emergency lighting testing, and locking arrangements. It is enforced by the local fire marshal.

• NFPA 101, Life Safety Code: Many fire departments in Kansas and across the country adopt or use NFPA 101 as a reference standard for enforcement, particularly for existing buildings. While largely harmonized with the I-Codes, NFPA 101 sometimes provides more detailed or slightly different requirements for specific occupancies. When in doubt, designing to the most restrictive requirement between the adopted IBC and NFPA 101 is the safest approach.

Frequently Asked Questions (FAQ)

Does Kansas have a statewide building code?

No, Kansas does not have a statewide building, fire, or residential code. All construction codes are adopted and enforced by local jurisdictions, such as individual cities or counties.

What is the difference between egress travel distance and common path of egress?

Egress Travel Distance is the total distance from the most remote point in a space to the door of a protected exit. Common Path of Egress is the initial portion of that travel distance where an occupant has only one direction to go before reaching a point where they have a choice of two separate exits. The allowable common path distance is much shorter than the total travel distance.

Are exit signs required to be red or green in Kansas?

The IBC and NFPA 101 do not mandate a specific color for exit signs, only that they have "EXIT" in conspicuous letters. While red is traditionally common, green is often used to signify "go." The choice is typically left to the designer, but it's wise to maintain consistency throughout a building and check for any local preference with the fire marshal.

When is a second exit required from a space?

A second exit is generally required based on three main factors outlined in IBC §1006: the occupant load of the space, the travel distance to the exit (the "common path" rule), and the specific requirements for the occupancy type (e.g., hazardous occupancies).

Do I need a fire-rated corridor for a small office?

It depends on the occupant load. Per IBC Table 1020.1, for a Group B (Business) occupancy, a 1-hour fire-rated corridor is required if the occupant load it serves is greater than 30. If the load is 30 or less, a rating is not required.

How often does emergency lighting need to be tested?

According to the IFC and NFPA 101, emergency lighting systems must be tested monthly for 30 seconds and annually for a full 90-minute duration. Written records of these tests must be kept for inspection by the fire marshal.

Where can I find the adopted building codes for a specific city in Kansas?

The best source is the official website for the city or county. Look for the "Building Department," "Planning & Development," or "Code Enforcement" sections. They typically list their currently adopted codes or have them available in their municipal code online.

Can I use photoluminescent ("glow-in-the-dark") exit signs?

Yes, photoluminescent exit signs are permitted by IBC §1013.5 as an alternative to internally or externally illuminated signs, but only under specific conditions. They must be listed and labeled to UL 924 and be charged by a reliable light source that is present whenever the building is occupied. Their use must be approved by the local building official.