Written By: Brad Campbell | May 18, 2026
When a hurricane or strong windstorm hits, one of the most dangerous threats to a building isn’t the wind alone. It’s the debris carried by that wind.
Broken tree limbs, gravel, signage, and structural fragments can turn into high-speed projectiles capable of shattering unprotected windows, glass doors, and other vulnerable glazed surfaces. This can quickly breach a building’s envelope, exposing it to further damage from internal wind pressure and heavy rains, not to mention putting any occupants at serious risk of harm.
ASTM E1996 is a windborne debris impact performance standard that defines how glazing should be tested against exactly this type of threat. Understanding exactly what it is, how it works, and what it does (and doesn’t) measure is important when it comes to evaluating certain impact-resistant window, door, and curtain wall systems.
ASTM E1996 is a standard specification published by ASTM International, officially titled Standard Specification for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Windborne Debris in Hurricanes. The most current version is ASTM E1996-20, published in 2020.
The standard is one of several that emerged in response to widespread glazing failures observed after major hurricane events, particularly in the wake of Hurricane Andrew in 1992. Researchers and engineers recognized that wind pressure alone didn't fully explain the destruction; flying debris was punching through windows and allowing catastrophic pressure differentials to build inside structures, contributing to roof failures and, in severe cases, complete building collapse.
ASTM E1996 defines minimum performance criteria for exterior glazing systems, including windows, skylights, curtain walls, storefronts, and doors, as well as retrofit protective systems like security glazing applied over existing glass. The standard applies primarily to buildings in hurricane-prone regions as defined by ASCE 7 wind speed maps, though its relevance extends to any structure where windborne debris resistance is a design consideration.
As a specification standard that defines windborne debris impact performance requirements and the test methods used to determine whether a product meets them, ASTM E1996 does not evaluate ballistic resistance, forced entry resistance, blast resistance, or seismic performance. Each of those threats has its own dedicated standard.
What ASTM E1996 does measure is whether a glazing system can withstand the impact of windborne debris under conditions representative of a major hurricane, and whether it remains structurally intact and weather-resistant after that impact.
The standard works in conjunction with ASTM E1886, which is the test method standard that defines the procedures laboratories follow when conducting the physical evaluation of materials. Think of E1996 as the rulebook and E1886 as the step-by-step instructions. Products are typically described as meeting ASTM E1996 criteria when they have been evaluated using the E1886 test method.
It's also worth noting that ASTM E1996 does not address installation. A glazing product can perform well in laboratory testing and still fail in the field if it isn't properly installed into the framing system. System-level performance and installation per manufacturer specifications are both critical to real-world outcomes.
The centerpiece of ASTM E1996 is the missile impact testing. The standard defines two primary missile types to test:
After the missile impact testing phase, surviving specimens undergo cyclic pressure loading, which consists of a series of positive and negative air pressure pulses that replicate the dynamic wind loads a building envelope experiences during a storm. This portion of the test evaluates whether the system maintains structural integrity and weather resistance even after sustaining a direct hit.
To meet ASTM E1996 criteria, a glazing system must pass both phases: withstanding the missile strike without dangerous penetration, and surviving the subsequent pressure cycling without catastrophic failure or water infiltration.
The standard covers exterior windows, sliding glass doors, swinging doors, skylights, curtain wall assemblies, storefronts, and other glazing systems, including retrofit security glazing solutions. Any exterior glazing element exposed to windborne debris during a hurricane falls within scope.
In many hurricane-prone jurisdictions, impact resistance testing in accordance with ASTM E1996 (using the ASTM E1886 test method) is referenced directly in the local building code. Florida, Texas, and other Gulf and Atlantic Coast states have adopted provisions requiring glazing in certain wind zones to meet these performance criteria. Always consult the applicable local code for specific requirements.
Miami-Dade County maintains one of the most stringent impact-resistant glazing approval programs in the country. Products receiving a Miami-Dade Notice of Acceptance (NOA) have been evaluated by the county's product control division, which uses ASTM E1886/E1996 as part of its protocol but adds further requirements on top. An NOA is a county-level product approval; ASTM E1996 is the underlying national standard that feeds into it.
No. Windborne debris impact resistance and forced entry resistance are distinct performance characteristics governed by separate standards. A glazing system designed and tested for windborne debris impact may offer some incidental resistance to forced entry, but the two are evaluated differently. Products intended to resist forced entry are typically evaluated under different ASTM standards specific to that threat, such as F3038.
HOW CAN WE HELP YOU?
