Added Fire
Fire-Resistant Gypsum Panels are classified for use in UL assemblies that can deliver fire ratings up to 3 hours in ceilings and as long as 4 hours in wall and column systems. To review a collection of these system assemblies that meet a wide range of design requirements, refer to GA-600 Fire Resistance and Sound Control Design Manual.
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Most notably are floor- and roof- ceiling assemblies that have only one layer of gypsum board as a ceiling membrane. This single layer will be the Type C formulation and can only be attained with the Type X when an additional layer of board is added. Another area where there is a marked difference is in the fire protection of structural columns.

UL fire resistance directories
Why do some fire-rated ceiling assemblies require Type X and others Type C gypsum board? Type C gypsum board will maintain its material integrity in a fire condition better than Type X gypsum board. The assembly must be constructed with the components listed in the UL design.

Gypsum is a naturally fire-resistant material that has become a leading construction component of fire-rated wall assemblies. Interior finishing materials are rated for flammability.
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