What is the minimum joint compound thickness recommended for smoothing out imperfections on drywall?

The recommended minimum joint compound thickness for smoothing out imperfections on drywall is typically around 1/8 inch. This thickness allows for effective coverage of minor blemishes and irregularities while ensuring that the compound adheres properly to the surface. Applying a very thin layer is essential to avoid issues such as cracking or peeling as it dries, which can occur if the compound is applied too thickly in one application.

Using this minimal thickness, contractors can build up several coats as necessary to achieve a perfectly smooth finish, while controlling the weight and drying time of the compound. A thicker layer might not only be more difficult to manage but also lead to longer drying times and greater risk of defects in the finish. Thus, the choice of 1/8 inch is practical and aligns with standard practices in drywall finishing.