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Stairwell reentry requires that building occupants can open stair-side doors and exit the stairwell if it becomes smoke-filled. The IBC and NFPA 101 differ: the IBC requires simultaneous remote unlocking from the fire command center or main entrance (2024 edition now also requires fire alarm release and power-failure release); NFPA 101 requires automatic release on fire alarm and allows selected reentry, which the IBC does not. Fail-safe electric strikes cannot be used on fire-rated stairwell doors: the code requires unlocking without unlatching, and a fail-safe electric strike retracts the keeper and removes positive latching. The correct hardware is fail-safe electrified lever trim for Von Duprin exit devices, or a fail-safe lockset. High-rise buildings with electrically-locked stair doors also require a two-way communication system at every fifth floor of the stairwell.
High-rise buildings present door hardware challenges that do not exist in low-rise construction. The stairwell is the primary means of vertical evacuation, but in a fire it can fill with smoke fast enough to trap occupants. The hardware on every stair door is the mechanical mechanism that determines whether those occupants can get out or not. Getting it wrong is not a code violation that generates a correction notice: it is the specific scenario that killed six people in a Chicago stairwell in 2003.
Browse high-rise and stairwell reentry hardware at SecurityParts.com: Von Duprin 33A 98/99 Series exit devices with electrified trim for stairwell reentry, Von Duprin complete parts catalog, electric strike parts for non-fire-rated applications, Schlage fail-safe cylindrical lock parts, and the complete Allegion high-rise hardware catalog.
The History That Made Stairwell Reentry a Code Requirement
On October 17, 2003, a fire broke out in a storage room on the 12th floor of the Cook County Administration Building in Chicago. Six employees died. They were not overcome by flames: they were trapped in a stairwell. The stair-side doors on multiple floors were mechanically locked, which was common building security practice at the time to prevent unauthorized access to tenant floors from the stairwell. When the occupants entered the stairwell and found the stair-side doors locked on multiple floors, they could not exit the stairwell to reach safety. The stairwell filled with smoke.
This event, combined with earlier stairwell entrapment deaths, drove model code changes that tightened stairwell reentry requirements significantly. The IBC progressively tightened the requirements from the 2003 edition through the 2024 edition. NFPA 101 had required fire-alarm-triggered automatic release since earlier editions. Both codes now require that locked stair-side doors be unlockable remotely, automatically, or both, so that occupants can exit a compromised stairwell regardless of whether a security system is active.
IBC vs NFPA 101: How Stairwell Reentry Requirements Differ
International Building Code (IBC)
Release trigger (2018 and earlier)
Signal from fire command center, if present, or by emergency personnel from a single location inside the main entrance. Fire alarm activation was NOT a required trigger in earlier IBC editions.
Release trigger (2024 edition)
Now requires all three: fire command center/main entrance signal, fire alarm activation, AND power failure. Aligns with NFPA 101 and codifies fail-safe hardware practice.
Selected reentry
NOT PERMITTED. IBC requires all stair-side doors to be non-locking or remote-unlockable. No selected reentry option.
Mechanical locks on 4 stories or fewer
NOT PERMITTED in recent editions. Only the 2003 IBC edition allowed mechanical locks for stairs serving 4 stories or fewer. All later editions require fail-safe remote release.
High-rise communication
REQUIRED. Every fifth floor must have a telephone or two-way communication device connected to a constantly attended location when stair-side doors are electrically locked in a high-rise building.
NFPA 101 Life Safety Code
Release trigger
Automatic release actuated by initiation of the building fire alarm system. NFPA 101 has required fire-alarm-triggered release for multiple editions, ahead of the IBC.
Selected reentry
PERMITTED under specific conditions: at least two stair-side doors in the stairwell must allow reentry; no more than four locked floors between reentry levels; the top floor or next-to-top floor must allow reentry with access to another exit; required signage on both locked and unlocked doors.
Mechanical locks on 4 stories or fewer
PERMITTED. NFPA 101 allows mechanical (non-electrified) locking of stair-side doors in stairs serving four stories or fewer, with no remote release required. The IBC does not allow this exception in recent editions.
UL 294 / UL 1034 listing (2024 edition)
New requirement in NFPA 101 2024: all new electromechanical or electromagnetic locking hardware on stairwell doors must be listed to UL 294 or UL 1034.
The IBC vs NFPA 101 jurisdiction mistake that creates non-compliant stairwell hardware: Specifiers who look up "stairwell reentry requirements" and find NFPA 101 selected reentry rules (which are widely published) may apply them on a project where the IBC is the adopted code. The IBC does not allow selected reentry. A high-rise building in an IBC jurisdiction specified with selected reentry hardware will have mechanically-locked stair-side doors that do not comply with the IBC requirement for simultaneous unlocking. Verifying which code is adopted in the project jurisdiction before specifying stairwell door hardware is the essential first step.
Why Fail-Safe Electric Strikes Cannot Be Used on Fire-Rated Stairwell Doors
This is the most common technical mistake in stairwell reentry hardware specification, and understanding the exact mechanism prevents it.
Both the IBC and NFPA 101 require that stairwell doors be capable of being unlocked without unlatching. The latch bolt must remain extended and engaged in the strike even while the lever or trim on the stair side is in the unlocked condition. This requirement exists because fire doors must maintain positive latching to resist fire pressure: a fire pushing against the latch-side face of the door must encounter a mechanically engaged latch bolt that holds the door closed.
A fail-safe electric strike works by retracting the strike keeper when power is lost or when an unlock signal is sent. When the keeper retracts, the latch bolt has no surface to engage against. The door is technically closed, but the latch bolt is not positively held in any strike. Under the pressure differential created by a fire on one side of the door, this unlatched door can be pushed open.
Fail-Safe Electrified Lever Trim
Von Duprin electrified trim on 98/99 Series or 33A Series exit devices. The trim lever on the stair side is electrically held locked in normal operation. On unlock signal or power failure, the lever becomes operable. The exit device latch bolt remains extended and engaged in the strike throughout.
Satisfies both the unlock and the without-unlatching requirements simultaneously.
Fail-Safe Electric Strike
Retracts the keeper on unlock signal or power failure. Removes the mechanical engagement between the latch bolt and the strike. The door is no longer positively latched. Fire pressure can push the door open against the unretained latch bolt.
Cannot maintain positive latching during fire conditions. Prohibited on fire-rated stairwell doors.
Fail-Safe Lockset or Mag Lock + Passage Set
A fail-safe lockset unlocks the lever electrically while the latch bolt remains extended. Alternatively, a magnetic lock on the stair side paired with passage hardware and a motion sensor on the egress side can work, but requires additional code compliance verification (sensor, manual override button, fire alarm release, power failure release).
The 2024 IBC Three-Trigger Requirement: What Changed
Single trigger: fire command center or main entrance signal
Earlier IBC editions only required that stairwell doors be capable of simultaneous unlocking by a signal from the fire command center (if present) or by emergency personnel from the main entrance. If the fire department had not arrived and no one was at the command center, the doors stayed locked. Power failure did not unlock them unless fail-safe hardware was specified voluntarily.
Three triggers: command center, fire alarm activation, power failure
The 2024 IBC added fire alarm signal activation and power failure as additional required unlock triggers. Any one of the three conditions must independently cause simultaneous unlocking of all electrically-locked stairwell doors. This aligns the IBC with NFPA 101's fire-alarm-activated requirement and codifies the industry practice of specifying fail-safe hardware, making fail-safe specification mandatory under the 2024 edition.
The practical consequence for hardware specification is that on projects where the 2024 IBC is adopted, specifying fail-safe hardware for stairwell reentry is no longer just best practice: it is a code requirement. Fail-secure hardware (which fails locked, maintaining positive latching on power loss) cannot be used for the stair-side locking mechanism on a stairwell reentry door where the 2024 IBC applies.
High-Rise Building Stairwell Communication System Requirement
The IBC imposes a communication requirement that goes beyond the door hardware itself for high-rise buildings with electrically-locked stairwell doors. A telephone or two-way communication device must be provided at every fifth floor of the stairwell, connected to a constantly attended location (the fire command center, security desk, or other continuously staffed station).
The purpose is to allow an occupant who is inside the stairwell and cannot exit (because the doors are locked and the remote unlock has not yet been activated) to call for help. This is the scenario the Cook County Administration Building occupants faced in 2003: the stairwell doors were locked, no one had remotely released them, and the occupants had no way to communicate their location to building staff or first responders.
NFPA 101 Selected Reentry: When It Is Used and What It Requires
Selected reentry is a NFPA 101 option that allows some stair-side doors to be mechanically locked (not capable of unlocking remotely or automatically) while others remain unlocked or electronically unlockable. It provides a security benefit for floors that handle highly sensitive operations, but the IBC does not permit it. Selected reentry is only a valid specification in jurisdictions where NFPA 101 is the adopted code and the IBC is not.
NFPA 101 Selected Reentry Rules
- At least two stair-side doors in the stairwell must allow reentry (be unlocked or electronically unlockable)
- No more than four locked floors between floors that allow reentry
- The top floor or next-to-top floor in the stairwell must allow reentry with access to another exit
- Signage on stair-side doors that allow reentry must identify those doors as reentry points
- Signage on stair-side doors that do not allow reentry must identify the nearest reentry floor in both the up and down directions
In practice, selected reentry is rarely used and is not available under the IBC. The NFPA 101 compliance requirement that the AHJ confirm selected reentry applicability means that specifiers who consider it must obtain explicit AHJ approval before specifying mechanically-locked floors in a stairwell that would not comply with full simultaneous-unlock requirements.
Door Hardware for Other High-Rise Building Door Types
| Door Location | Fire Rating | Key Hardware Requirements | SecurityParts.com Products |
|---|---|---|---|
| Stairwell enclosure doors (2-hour construction) | 90-minute | Self-closing, positive latching, fire exit hardware or lever; reentry hardware on stair side | Von Duprin 98/99 with electrified trim |
| Stairwell enclosure doors (1-hour construction) | 60-minute | Self-closing, positive latching; fire exit hardware where assembly occupancy thresholds apply | Von Duprin 33A Series fire-rated exit device parts |
| Horizontal exit fire doors | 90-minute (in 2-hour barrier) | Self-closing, positive latching, swing in direction of egress; pairs swing opposite directions | LCN 4040XP door closer parts |
| Floor corridor doors (tenant entry) | Per AHJ | Access control integration; electrified lockset or electric strike on non-fire-rated tenant doors | Electric strike parts for tenant corridor access |
| Lobby and podium exit doors | None (exterior) | Panic hardware if assembly occupancy threshold exceeded; access control on entry side | Von Duprin exit device parts for lobby egress |
| Mechanical/electrical room doors | 45 to 90-minute (hazardous area) | Self-closing, positive latching; restricted access with cylindrical or mortise lock | Schlage ND Series cylindrical lock parts |
For parts and specification support on any of these door types, contact SecurityParts.com at 845-935-0301 or the contact page.
Why Choose Security Parts for High-Rise Door Hardware Parts
Fail-safe electric strike prohibition mechanism documented, 2024 IBC three-trigger change, Cook County fire history, communication system requirement, and same-day OEM shipping.
Strike Prohibition Mechanism
We document the specific mechanical reason fail-safe electric strikes are prohibited on fire-rated stairwell doors: keeper retraction removes positive latching, allowing fire pressure to exploit the unretained latch bolt. No competitor explains the mechanism at the parts level.
2024 IBC Three-Trigger Change
We document the 2024 IBC change that added fire alarm activation and power failure as required unlock triggers in addition to the fire command center, making fail-safe hardware mandatory under the 2024 edition rather than best practice.
Communication System Coordination
We document the every-fifth-floor two-way communication requirement as a separate requirement from the unlocking hardware, requiring Division 27/28 coordination that is often missed in door hardware specifications.
Same-Day OEM Shipping
Von Duprin electrified trim, Schlage fail-safe lockset parts, and LCN closer parts ship same day from US warehouses. Call 845-935-0301 or the contact page for stairwell hardware support.
What Makes Security Parts Different for High-Rise Hardware Parts
- We document the Cook County Administration Building fire of 2003 as the specific historical event that killed six people in a stairwell with mechanically-locked stair-side doors, explaining why the stairwell reentry requirements are not bureaucratic code complexity but a response to documented preventable deaths.
- We document the fail-safe electric strike prohibition with the specific mechanical explanation: the keeper retraction removes positive latching, and the code requires unlocking without unlatching precisely because fire pressure can push open a door whose latch bolt is not mechanically engaged in a strike.
- We document the IBC vs NFPA 101 selected reentry difference: NFPA 101 allows selected reentry with spacing and signage rules; the IBC does not allow selected reentry at all. Specifiers who apply NFPA 101 selected reentry rules on an IBC-jurisdiction project create non-compliant hardware.
- We document the 2024 IBC three-trigger change that added fire alarm activation and power failure as mandatory unlock triggers, closing the gap between older IBC editions and NFPA 101 and making fail-safe hardware specification mandatory rather than voluntary under the 2024 edition.
- We carry Von Duprin electrified exit device trim for stairwell reentry, Schlage fail-safe cylindrical lock parts, and LCN door closer parts for all high-rise hardware applications as authorized Allegion OEM parts.
- Free shipping on orders over $450. Same-day shipping from US warehouses on stocked parts. 30-plus years of commercial door hardware experience.
Frequently Asked Questions About High-Rise Building Door Hardware
What is stairwell reentry and why is it required in high-rise buildings?
Stairwell reentry allows building occupants inside a stairwell to open the stair-side door and reenter the building floor when the stairwell becomes smoke-filled. High-rise stairwells are commonly locked on the stair side to prevent unauthorized tenant floor access during normal operations. If those locks cannot be remotely released during a fire, occupants who enter the stairwell can become trapped. The Cook County Administration Building fire in Chicago in 2003 killed six people in this exact scenario. Both the IBC and NFPA 101 now require stair-side doors to allow remote unlocking or automatic unlocking under fire conditions.
Why can't a fail-safe electric strike be used for stairwell reentry on a fire door?
A fail-safe electric strike retracts the strike keeper when unlocking, removing the mechanical engagement between the latch bolt and the strike. The code requires stairwell doors to unlock without unlatching: the latch bolt must remain extended and engaged even while the stair-side lever is unlocked. A fail-safe electric strike violates this by eliminating positive latching, allowing fire pressure to push the door open against the unretained latch bolt. The correct hardware is fail-safe electrified lever trim (Von Duprin) or a fail-safe lockset, which unlocks the lever while leaving the latch bolt mechanically engaged in the strike.
What is the difference between IBC and NFPA 101 stairwell reentry requirements?
Three key differences: release trigger (IBC pre-2024 required fire command center signal; NFPA 101 requires fire alarm activation; 2024 IBC now requires both plus power failure), selected reentry (NFPA 101 allows some floors mechanically locked with spacing and signage rules; IBC does not allow selected reentry), and mechanical locking on 4 stories or fewer (NFPA 101 permits this; IBC does not in recent editions). Verifying which code your jurisdiction has adopted before specifying stairwell hardware is essential because applying NFPA 101 rules on an IBC-jurisdiction project creates non-compliant hardware.
What is the every-fifth-floor two-way communication requirement in high-rise buildings?
The IBC requires a telephone or two-way communication device at every fifth floor of the stairwell in high-rise buildings with electrically-locked stair doors, connected to a constantly attended location. This allows occupants trapped in the stairwell to call for help if the remote unlocking has not yet been activated. It is a separate requirement from the unlocking hardware, requiring coordination between Division 8 (hardware) and Division 27 or 28 (communications) during construction. Many stairwell hardware specifications address the unlocking requirement but miss the communication system requirement.
What are the three 2024 IBC trigger conditions for unlocking stairwell doors?
The 2024 IBC expanded from one trigger to three, any of which must independently cause simultaneous unlocking of all electrically-locked stairwell doors: a signal from the fire command center or by emergency personnel from the main entrance (the only trigger in prior editions); activation of a fire alarm signal in an area served by the stairwell (new in 2024; aligns IBC with NFPA 101); and power failure to the electric lock or locking system (new in 2024; codifies what was already industry standard practice of specifying fail-safe hardware). Under the 2024 IBC, fail-safe hardware specification is no longer voluntary: it is required by the power-failure trigger.
What exit device hardware is used for stairwell reentry on fire-rated doors?
The two compliant hardware approaches are fail-safe electrified lever trim for fire exit hardware, and fail-safe locksets. Von Duprin electrified trim on 98/99 Series or 33A Series exit devices provides a stair-side lever that is electrically held locked during normal operation and unlocks on fail-safe signal or power failure, while the exit device latch bolt remains extended and positively engaged in the strike throughout. For stair doors with cylindrical locksets rather than exit devices, a fail-safe lockset unlocks the lever electrically while maintaining latch engagement. Fail-safe electric strikes cannot be used on fire-rated stairwell doors.