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Hard Rock. Compared with standard drywall, ToughRock Gypsum Board is less likely to crack, sag, or absorb moisture, the maker says. It also weighs 25 percent less and is Greenguard-certified for low VOC emissions. The product is suitable for interior walls and ceilings, veneer plaster base systems, and fire-rated assemblies. A 1?2-inch-by-4-foot-by-8-foot sheet costs about $8. Georgia-Pacific Building Products, 800/225-6119,