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// CODE SNIPPET

R609.8 Mullions

Residential Code 2021 of Colorado > 6 Wall Construction > R609 Exterior Windows and Doors > R609.8 Mullions
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Mullions shall be tested by an approved testing laboratory in accordance with AAMA 450, or be engineered in accordance with accepted engineering practice. Mullions tested as stand-alone units or qualified by engineering shall use performance criteria cited in Sections R609.8.1, R609.8.2 and R609.8.3. Mullions qualified by an actual test of an entire assembly shall comply with Sections R609.8.1 and R609.8.3.

R609.8.1 Load Transfer

Mullions shall be designed to transfer the design pressure loads applied by the window and door assemblies to the rough opening substrate.

R609.8.2 Deflection

Mullions shall be capable of resisting the design pressure loads applied by the window and door assemblies to be supported without deflecting more than L/175, where L is the span of the mullion in inches.

R609.8.3 Structural Safety Factor

Mullions shall be capable of resisting a load of 1.5 times the design pressure loads applied by the window and door assemblies to be supported without exceeding the appropriate material stress levels. If tested by an approved laboratory, the 1.5 times the design pressure load shall be sustained for 10 seconds, and the permanent deformation shall not exceed 0.4 percent of the mullion span after the 1.5 times design pressure load is removed.

Related Code Sections


R609.8 Wall Construction, Mullions
Mullions shall be tested by an approved testing laboratory in accordance with AAMA 450, or be engineered in accordance with accepted engineering ...
Residential Code 2021 of Colorado > 6 Wall Construction > R609 Exterior Windows and Doors > R609.8 Mullions
716.3.3.1 Fire and Smoke Protection Features, Window Mullions
Metal mullions that exceed a nominal height of 12 feet (3658 mm) shall be protected with materials to afford the same fire ...
Building Code 2021 of Colorado > 7 Fire and Smoke Protection Features > 716 Opening Protectives > 716.3 Fire Window Assemblies > 716.3.3 Fire Window Frames > 716.3.3.1 Window Mullions
716.3.3.1 Fire and Smoke Protection Features, Window Mullions
Metal mullions that exceed a nominal height of 12 feet (3658 mm) shall be protected with materials to afford the same fire-resistance rating ...
Building Code of the Department of Personnel & Administration/Office of the State Architect (DPA/OSA) > 7 Fire and Smoke Protection Features > 716 Opening Protectives > 716.3 Fire Window Assemblies > 716.3.3 Fire Window Frames > 716.3.3.1 Window Mullions
716.6.6 Fire and Smoke Protection Features, Window Mullions
Metal mullions that exceed a nominal height of 12 feet (3658 mm) shall be protected with materials to afford the same fire-resistance rating ...
Building Code of the Department of Personnel & Administration/Office of the State Architect (DPA/OSA) > 7 Fire and Smoke Protection Features > 716 Opening Protectives > 716.6 Fire-Protection-Rated Glazing > 716.6.6 Window Mullions
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