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Norm Abram replies: The 5/8-inch, fire-code drywall (called Type X) increases a wall's fire rating to a minimum of 1 hour, from the 30-minute rating for standard Â½-inch drywall. And it's not just thickness that makes the difference. Type X has a denser core and contains glass fibers that keep it from crumbling in the heat.
Acorrding to Georgia Pacific they have test results stating CDX plywood is stiffer than OSB. This may be true for 3/4 CDX plywood, but when we use 1-1/8 OSB Gold Bond subfloor on our custom homes we've seen excellent results and a very stiff floor, ideal for cermica tile and other heavy surfaces.