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In residential construction, the most commonly used thickness of drywall for ceilings is 5/8". This thickness is preferred primarily for its strength and fire-resistance properties, making it particularly suitable for areas where a higher level of durability is needed, such as ceilings. Using 5/8" drywall helps to reduce sagging over larger spans, especially in ceilings where weight is a consideration, particularly in cases where insulation may be present or if the ceiling is being finished with texture or other materials. Moreover, many building codes may specifically require 5/8" drywall in ceilings for fire-rated assemblies, further solidifying its status as the standard choice in residential projects. While 1/2" drywall is often used for walls and might be seen in some ceilings as well, it does not have the same sag-resistance capabilities of 5/8". Thicker options like 3/4" or 1" drywall are generally not practical for ceilings due to their weight, cost, and handling difficulties, making them less common choices.