Interior finishing typically entails covering rough walls, ceilings, and floors, as well as placing trim and hardware on doors and windows. Wall finishes are used to cover building components such as structural members, insulation, ductwork, pipes, and wires in a decorative manner.... The three most common types of interior finishing materials are drywall, plaster, and stucco. Each has its advantages and disadvantages which may make one type of finish better suited for a particular application. Drywall is the most popular interior finishing material because it is easy to work with and inexpensive. It is also durable and can be easily altered or modified after it is up if necessary. The major disadvantage of drywall is that it is not soundproof and therefore not ideal for rooms where privacy is important. Plaster is a long-lasting material that is suitable for most applications where drywall would be used. The main advantage of plaster over drywall is that it is more soundproof. This makes it good for rooms where noise reduction is important such as bedrooms or offices. The down side to plaster is that it is difficult to modify or adjust after it's been installed so if you want to add molding or change the color of a room later on then drywall is the way to go. Stucco is a cement-based material that is used to cover exterior walls.