by Mouldings. Casing is used to trim inside and outside door and window openings to cover the gap between drywall and the door or window frame. Casings are often the most visible molding profile in a room.

What is casing used for?

The main purpose of casing is to surround all doors and windows, covering any space or gap left between the drywall and frame. In addition, casing is one of the most visible moulding trims in a home.

Do windows need casing?

Do windows need casing? No, windows do not need casing. Homes often forgo casing windows as a means to save money or even as a style choice.