Cove moulding is a type of trim found inside homes, generally in the corner where the wall meets the ceiling. However, cove moulding can also be used on cabinets, shelves, mantles, and more. Concave moulding is primarily used to smooth the transition between the ceiling and the wall. It’s usually used to soften the transition on the inside corners of walls or to hide visible joints but it can be used all over different areas of the home.