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In terms of designing code-compliant openings, 45-minute fire-rated glass can be extremely versatile, as it can satisfy code requirements in multiple application types. However, when project teams specify this type of glazing, they should be aware of code-driven limits on its size and performance capabilities as well as where it can be used within the built environment.
Glass that has a 45-minute fire rating can be used in opening protectives, such as fire doors, sidelites or transoms and fire-rated windows within fire barriers and fire partitions. It can also be used in skylights when a fire rating is required.
In the 2024 edition of the International Building Code (IBC), Table 716.1(2) Opening Fire Protection Assemblies, Ratings and Markings offers an in-depth explanation of which applications can use 45-minute fire-rated glass and meet code requirements. For instance, in some 60-minute fire-rated fire barriers, fire partitions, exterior walls and smoke barriers, fire doors, windows, transoms and sidelites can use 45-minute fire-rated glass to meet code requirements.
However, since local building codes can vary, design teams are encouraged to check local codes and clarify any ambiguities with the Authority Having Jurisdiction (AHJ).
Fire-resistance-rated glass guards against fire, smoke and radiant and conductive heat. And fire-protection-rated glass defends against fire and smoke. Both rating types have their use within fire-rated design. However, 45-minute fire-rated glass is always fire-protective.
As such, it is important for specifiers to note both the size of the glazing assembly relative to its wall and the marking on the IBC fire label to ensure code compliance.
Table 716.1(2) states 45-minute fire-rated glass can be used up to the “maximum size tested.” However, this allowance guides the size of opening protectives generally. When specifiers use fire-protection-rated glazing, these openings must also be 25 percent or less of the total wall area of a fire barrier and no single opening shall exceed 156 square feet, according to section 707.6 Openings in the 2024 IBC. They must also be marked with a D and/or OH and H as described in Table 716.1(2).
Technical Glass Products can provide literature, presentations and other information on how to use 45-minute fire-rated glass. Reach out today to create with confidence.
