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type "C" sheetrock

C

cda

SAWHORSE
Joined
Oct 19, 2009
Messages
20,962
Location
Basement
I think I asked the question before

but Type C sheetrock in place of Type X, do you see it much??

pros /// cons???

SHEETROCK FIRECODE C Core gypsum panels provide improved fire protection over standard FIRECODE panels due to additives that enhance the integrity of the core under fire exposure. Comply with Type X requirements. Systems using these gypsum panels have qualified for fire ratings of up to 4 hours in walls, 3 hours in ceilings, 4 hours for column protection. In order to attain fire-resistance ratings, the construction of the partition and/or floor and ceiling assemblies must conform to the system designs as tested at the indicated fire testing facilities (see System Folders). (2) Max. frame member spacing: 24” o.c.

The panels are available in 5/8” and 1/2” thicknesses; they are both UL-Classified (Type C) for application in fire-rated construction,
 
it's stiffer; you see it alot for ceilings with trusses spaced at 24" o.c. (the 1/2" one).
 
Type X is generally used in generic designs. Any board marked as Type X may be used in the assembly calling for Type X.

Type C is generally used in proprietary designs. Only the brands named in the assembly may be used. Type C is a proprietary Type X so Type C could be substituted for generic Type X.

A "rocker", who seemed to be knowledgeable, told me that the "C" represented cork added with the other additives to the gypsum to get the rating, it was more expensive, and took a longer (special order) to get. I never followed up to see if that was all true.
 
Drywall also comes in varying degrees of fire-resistance. Beyond standard drywall which is naturally fire-resistant (made of rock and water) is Type X drywall that is infused with fiberglass and Type C which contains proprietary fire-resistant materials.

reserached it awhile back and the question came up again
 
Hey Plans..

It is more expensive and most places don't stock a lot of it.. I don't know that it's more than 24 hours lead time in most areas. It performs about the same as 5/8 type x if fire rating is what you need... you see alot of builders trying to use regular 1/2" for ceilings.. if the trusses are 24" oc, there are always failures.
 
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