Drywall is a modern building material that comes in large panels typically 4' by 8' having a gypsum core sandwiched between two heavy paper faces. These paper faces are often made from recycled paper. One face is smooth and is the surfacing face, and the other is more of a kraft paper backing face. It replaced older and more labor intensive interior finishing processes involving plaster and lath. Drywall came into popularity after WWII as faster and less expensive methods of home building were being developed.
There are many types depending on the activity and the place where it will be installed. Regular drywall is normally white on one side and brown on the other. This is the most common type used and is normally available in four by eight foot panels. Green board drywall, also known as moisture-resistant drywall, has a green covering that makes it more resistant to moisture than regular drywall. It is also often used as a tile backer in limited wet areas such as bathroom and basement walls, plus kitchens, and laundry and utility rooms.
Professional drywall crews use several special techniques for hanging drywall. Practiced correctly, these techniques speed installation and make taping, mudding, and finishing flow smoothly. The first step to hanging drywall is to take a pencil and mark on the floor and ceiling the placement of the vertical studs.