it is generally not recommended to put plastic over insulation before drywall in most residential or commercial construction scenarios. The main reason is that using plastic as a vapor barrier in this way can trap moisture within the walls, leading to potential issues like mold, rot, and reduced insulation effectiveness.
In modern construction practices, the use of vapor barriers is carefully considered to prevent moisture buildup inside wall assemblies. The general rule of thumb is that in cold climates, the vapor barrier should be installed on the warm side of the insulation to prevent warm, moist air from penetrating the insulation and condensing inside the wall cavity. In warm climates, it's often placed on the exterior side of the wall assembly to prevent warm, humid air from getting into the wall.
Instead of using plastic as a vapor barrier, construction codes and best practices often call for the use of special vapor retarders or kraft-faced insulation that comes with an integrated vapor barrier. These materials allow some degree of breathability while still helping to manage moisture.
If you are unsure about the appropriate insulation and vapor barrier setup for your specific situation, it's best to consult with a qualified contractor or building professional who can assess your building's design, climate, and other factors to make the right recommendation. Building codes and best practices can vary by region, so local expertise is crucial.