Special water and mold resistant drywall is used in wet applications such as in bathrooms and usually has a green paper face. Type x drywall has special core additives that allow it to be used in fire rated designs and usually comes in 5 8 thickness.
It normally comes in 5 8 inches thickness and its extra thickness can also improve its soundproofing characteristics.
Type x gyp board. Both regular and type x gypsum board are covered under the astm c 1396 gypsum board standard specification. Origins of fire rated board the development of fire rated drywall has come a long way since its inception in the 1940s. The core material of type x board is reinforced with short glass fibers.
The main additive that helps produce type x board is glass fiber. Type x gypsum board is defined by astm c1396 and generally requires a fire resistance rating of not less than one hour for 5 8 thick boards or 45 minutes for boards. Certainteed type x fire resistant drywall is an interior gypsum board consisting of a solid set fire resistive type x gypsum core enclosed in ivory colored face paper and a strong liner back paper.
As a result the gypsum particles shrink lose contact with each other and the board falls apart. This product is generally sold in 5 8 inch thickness or greater. Certainteed type x board features a specially formulated core providing fire resistance ratings when used in tested assemblies.
On exposure to fire gypsum loses chemically combined water. To achieve the one hour rating use a type x 5 8 wallboard. Type x gypsum board is used for most types of fire rated assemblies.
Type c is an industry phrase to designate enhanced gypsum panels that exceed the requirements for type x gypsum board in astm c1396. 5 8 type x gypsum board provides one hour fire protection when used on both sides of a steel or wood frame partition. Regular drywall has naturally occurring fire resistance due to the presence of gypsum in the core but is not fire rated.
Type x drywall is made with special noncombustible fibers. In a severe fire the fibers hold the calcined gypsum in place to continue to act as a barrier to fir rather than permitting it to erode. Type x drywall usually has perlite vermiculite or boric acid added for added fire resistance.
While the tried and tested classic gypsum board is still popular today s builder can also choose type x an extra fire resistant version that has been enhanced with the addition of fibers inside the gypsum core. To receive the type x designation a gypsum board must achieve at least a one hour fire resistance rating for 5 8 inch board or a 3 4 hour rating for 1 2 inch board in. Let s take a look at a few of these differences between type x and type c wallboard starting with the history of their development.
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