For All your Drywall Needs
Water-resistant drywall or "greenboard" has the same gypsum core as drywall, but it has a water-resistant facing. It is typically used in wet areas such as a bathtub or shower surround. It's not water-proof, however, and will deteriorate from moisture penetration.
Concrete backerboard, often called by the brand names "Durock" and "Wonder Board", is used as backing for ceramic tile. It has a solid concrete core and is faced on both sides with fiberglass. It's ideal for wet areas like shower walls and bathtub surrounds.
Drywall sheets come in 4'x8', 4'x10', 4'x12', and even larger. We recommend 4'x8' sheets for do-it-yourselfers; they're a little easier to work with.
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