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The Case for Coped Joints

Small details can make a big difference in the appearance of a project. For instance, in the box-beam ceiling project, one of those details is how well the pieces of cove molding fit together at the inside corners.
The best way to produce a tight fit is to cut a coped joint. With this type of joint, one piece of molding is cut, or coped, to match the shape of the other (see Illustrations below). The other piece has a square end, which is hidden behind the coped end.
Since the coped end of the molding fits over the adjoining piece of molding, a coped joint will fit tight - even if the walls and ceiling aren t square. And unlike a miter joint, there's little chance a gap will develop as the wood shrinks and swells.