CertainTeed Learning Center: Drywall and Performance Wallboards

Helpful Resources

CertainTeed Gypsum UL Classified Gypsum Board Assemblies
CertainTeed Gypsum Canada ULC Listed Gypsum Board Assemblies

What is the difference between "regular" and "Type X" gypsum board?

Both regular and Type X gypsum board are covered under the ASTM C 1396, gypsum board standard specification. Regular gypsum has naturally occurring fire resistance due to the presence of gypsum in the core. Type X has special core additives to increase the natural fire resistance. Type X gypsum board products will have a UL/ULC Marking printed on the back of each board identifying it as a fire-resistance rated board.

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