Drywall is made of the mineral gypsum sandwiched between two layers of paper. It was invented about a century ago to take the place of wet plaster on ceilings and walls.
Standard thicknesses are 1/2 and 5/8 inch for walls and ceilings; drywall sheets are typically 4x8 or 4x12 feet.
Large water molecules in gypsum make it naturally fire resistant.
You can now get drywall that also resists mold and moisture (good for baths and kitchens); high impact drywall (use in garages, workshops, and playrooms); and noise-reducing drywall (for home theaters and bedrooms).
Much of today’s drywall is made entirely of recycled materials.
Install drywall on ceilings first, then walls; with wood wall studs, place the board horizontally.
Drywall must be primed before you paint or wallpaper it.