The building code of the respective area provides the requirements for the thickness of the drywall panels. Commonly available thicknesses are ¼, ½, 3/8, and 5/8 inches. Different applications require different depth as specified by the standard codes. Among the three, 5/8 inch is the heaviest and the most soundproof. The 3/8 inch panels are used for covering the existing walls, whereas the 1/4 inch panels are used for curved walls and arches.