Coved ceilings are typically installed by using specific adhesive, screws, or both to attach the coving to the ceiling and wall. The type of adhesive and screws used can vary depending on the material of the coving and the surface being installed on. For example, polyurethane coving can be installed using a suitable adhesive, while wooden coving may require screws in addition to the adhesive. Using incorrect or unsuitable adhesives and screws can cause issues such as instability, peeling, or even damage to the wall and ceiling.