No, typically the thickness of drywall is the same for both ceilings and walls. The most common thickness for drywall used in residential construction is 1/2 inch (12.7 mm). This thickness is suitable for both walls and ceilings in most situations.
However, in some cases where increased strength or fire resistance is required, thicker drywall may be used. Thicker drywall options include 5/8 inch (15.9 mm) and even 3/4 inch (19.1 mm) thicknesses. These thicker drywall options are typically used in commercial buildings, areas with high traffic or potential impact, or where specific fire code requirements must be met.
In summary, while there are variations in thickness available for specific applications, the standard thickness of drywall used for both ceilings and walls in residential construction is typically 1/2 inch (12.7 mm).