Type C & Special Type X gypsum board

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Author Message (Unregistered Guest) Unregistered guest Posted on Wednesday, July 14, 2004 - 04:12 pm:    Is "Type C" the same as, or equivalent to, "Special Type X" gypsum board? Are both designations generic? Thanks. David R Combs, CSI, CCS, CCCA (Unregistered Guest) Unregistered guest Posted on Thursday, July 15, 2004 - 09:27 am:    Refer to United States Gypsum, Brochure SA927. Basically, there are three types: Regular, "Firecode Core" (Type X) having additional fire resistance, and "Firecode C Core" (improved fire resistance over Type X). ASTM C 36 only recognizes regular and Type X. From that I pressume Firecode C to be manufacturer-specific, and not necessarily generic or common to all manufacturers. Hopefully, others will chime in if I have misunderstood the information. John Bunzick, CCS, CCCA Senior Member Username: bunzick Post Number: 235 Registered: 03-2002 Posted on Thursday, July 15, 2004 - 09:33 am:    1/2 inch thick Type C has also been tested in some assemblies in lieu of 5/8 Type X. However, remember that in order to achieve a fire rated partition, the products and materials must be as listed in the assembly used. That is, I would not substitute Type C for Type X unless the assembly permits it.