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(Unregistered Guest)
Unregistered guest
Posted on Wednesday, July 14, 2004 - 04:12 pm:   Edit PostDelete PostPrint Post

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:   Edit PostDelete PostPrint Post

Refer to United States Gypsum, Brochure SA927.

Basically, there are three types:
"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:   Edit PostDelete PostPrint Post

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.

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