Cracking the Code

Looking for a little help in understanding IBC label requirements? Over the years, there have been significant changes to the building codes for fire-rated glass windows, doors and walls. We can help. See below to take a closer look at some sample labels and define a few key terms.

IBC Labels

Fire-rated glass labels include a multitude of information, including the product name, basic characteristics (e.g., tempered, laminated, etc.), compliance with impact safety requirements, and whether it is listed by an independent testing agency, such as Underwriters Laboratories. Labels permanently affixed to fire-rated glass also indicate which fire tests it has passed, and which applications it is suited for. Starting with the 2012 IBC, the code incorporates amendments to the fire-rated glass marking system to further simplify the number of marks from the previous system. These were updated in the 2018 edition and can be found in 2021 IBC Table 716.1(1).

Use this interactive tool to find the markings on the labels and see their definitions.


IBC Label Sample 1

IBC Label Sample 2

ClickTap the appropriate Marking below to see it highlighted on the label sample.

Description of Location
Walls, openings (windows, sidelites, transoms) or doors

Meets wall assembly criteria.
ASTM E119 or UL 263
Meets fire window assembly criteria including hose stream test.
NFPA 257 or UL 9
Meets floor/ceiling criteria
ASTM E119 or UL 263
Meets fire door assembly criteria.
NFPA 252 or UL 10B or UL 10C

Hose Stream Test
Required for 45 minutes and above

Meets fire door assembly "Hose Stream" test.
NFPA 252 or UL 10B or UL 10C

Temperature Rise

Meets 450°F* temperature rise criteria for 30 minutes.
NFPA 252 or UL 10B or UL 10C


The time in minutes of the fire resistance or fire protection rating of the glazing assembly.

* For SI; °C = [(°F) -32]/1.8
Source: 2021 IBC Table 716.1(1), Marking Fire-Rated Assemblies

Take a more comprehensive look by downloading the PDF.

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