Modernizing Public Safety Through Advanced Wood Door Systems

Lessons from school security have transformed interior wood doors into high-performance systems that balance welcoming aesthetics with forced-entry resistance.

• By Mitzi Amon
• May 05, 2026

The past two decades have marked notable shifts in the frequency and manner of violent crimes occurring in schools and community spaces, and the studied characteristics of these events have fundamentally changed the way architects, security professionals and building component manufacturers approach commercial building design. Just like fire, severe weather or seismic activity, violent attacks are now a recognized risk category that must be addressed both outside and inside public spaces.

At the center of this shift is the interior wood door. Once considered a passive architectural element, these doors are now active security systems inside buildings, serving the dual purpose of supporting lockdown activities and resisting forced entry while also maintaining a warm, welcoming atmosphere. The latest advances in interior wood doors reflect this new reality with security-rated systems designed around the lessons learned from past tragedies.

What School Attacks Taught Door Manufacturers About Security

Interior wood doors first became the focus of intense study following a series of high-profile school shooting incidents. Whereas earlier security strategies emphasized preventing intruders from entering a school building from the outside, attacks suddenly began happening inside schools, often carried out by students. As a result, interior wood doors, such as those used for classrooms and corridors, emerged as critical lines of defense.

In addition to broadening security plans to include interior elements, analysis of school events revealed patterns in how attackers attempted to breach locked interior doors. Reviews conducted by school safety experts and security organizations, including the security guidelines developed by the Partner Alliance for Safer Schools (PASS), identified several vulnerable areas of traditional classroom door openings, particularly the latch area, hinges and vision panels. These findings demonstrated that evaluating the security of individual door components, such as locking mechanisms alone, was insufficient. Instead, the entire assembly needed to be tested under realistic assault conditions to determine its level of security.

In the mid-2010s, a coalition of law enforcement, homeland security and active shooter experts developed the Shooter Attack Test Method (FTD-SA), a two-phase method that combines ballistic and forced-entry testing to replicate real-world attack scenarios. In the ballistic phase, test shooters target glass and lock areas with multiple rounds from an .223 AR-15 rifle. In the forced-entry phase, a 100-pound battering ram simulates brute-force attempts to breach the door. Together, they measure the level of force a door assembly can withstand and how effectively it delays entry, giving occupants valuable time to lockdown and precious minutes for first responders to arrive.

While FTD-SA provided a more realistic assessment than previous tests and offered valuable insight into door performance, it did not provide formal certification. In 2022, ASTM formalized the FTD-SA approach with ASTM F3561, the Standard Test Method for Forced-Entry-Resistance of Fenestration Systems After Simulated Active Shooter Attack, the first standardized method to certify the full door assembly against active shooter scenarios.

Although ASTM F3561 is patterned after FTD-SA, the two methods differ in how force is applied, as ASTM F3561 uses larger incremental forces during testing. The same door can pass both FTD-SA and ASTM F3561 and achieve comparable resistance, but the assigned performance level may be different because the scales are not equivalent. Viewing each certification level as a measure of foot-pounds of force is key for specifying the right system.

Because ASTM F3561 is a relatively new standard that requires extensive testing, manufacturers are currently in varying stages of certification. As a result, FTD-SA-rated doors are available in a broader range of tested configurations with greater flexibility in cores, glazing, hardware and door sizes. 

Shifting Focus from Component to Assembly

While door locks and hardware were historically viewed as central components in limiting access to rooms during active shooter events, more recent attack scenarios have revised this thinking, revealing other failure points like glazing. Analysis of how intruders behave when faced with locked doors has demonstrated that effective attack resistance requires the coordinated performance of the full door assembly—core, frame, hardware and glazing. Testing the complete assembly under realistic forced-entry conditions also matters, as it ensures that every component performs together as a system.

When working with a manufacturer that offers ASTM-certified doors, specifiers can expect the door to require the exact combination of components that were tested together for the model to meet the standard. For example, a manufacturer’s ASTM-certified door might include a solid-core wood door leaf constructed with extra heavy-duty particleboard or structural composite lumber, an 18-gauge steel vision frame, a heavy-gauge hollow metal door frame, attack-resistant glazing and the specific hardware models used during testing. The door must then be specified and installed with these same components to perform to the ASTM standard in real-world conditions.

In any public building, door security is now about more than locks and hardware—it’s about an entire door system designed to protect interior spaces using a combination of robust door construction, attack-resistant glass in tested frames and a properly tested assembly. While hardware still gets the spotlight, common failure points also include glass, which is why testing the full door assembly under realistic forced-entry conditions matters. It ensures that every component, from door core to glass to frame, performs together as a complete system, providing reliable protection when it is needed most.

Applying Lessons Learned

As the nature of violent events in public spaces continues to shift, door manufacturers are evolving their products alongside changing definitions of security. Applying the lessons learned from schools, door manufacturers now offer more security-rated options, like FTD-SA and ASTM Certified, that can benefit all public spaces, including office buildings, healthcare facilities, community centers and churches. More security-rated choices also allow specifiers to better align door systems with a building’s risk profile and operational needs. With ongoing advances, interior wood doors continue to offer meaningful points of protection within public environments and more robust solutions for security design.