Drywall – What differences does a drywall thickness do? Differnet Drywall types

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I am looking into drywall on the HomeDepot website and I see they have few thicknesses: 1/2", 5/8", 3/8" of the same Sheetrock brand 4'x8' Gypsum Board. What are the different use scenarios for each thickness?

Also, what are the different uses for the differnet types? For example, Gypsum, Gypsum Base, Firecode Core, UltraLight, Mold Tough, FireGuard, etc?

Best Answer

There are two websites that go into the detail for which you're seeking: National Gypsum and Gypsum.org.

Quickly (how I spec it):

3/8" = double layer applications, non-load bearing & closet/storage/decorative applications (not intended to restrict sound or provide structural support in single layer applications)

1/2" = standard "contractor-grade" thickness for walls & ceilings (min. code in most applications)

5/8" = standard "custom-grade" (when double 3/8" isn't used)