What is Casing?

In carpentry and construction, casing refers to the trim or molding used to finish the edges of doors, windows, and other openings in a building. Casing is typically made of wood, but can also be made from other materials such as plastic or composite materials.

Casing serves both a functional and aesthetic purpose. It covers the gap between the frame of the door or window and the surrounding wall, creating a finished and polished appearance. It can also help to insulate the space around the opening, and may help to reduce drafts and air leaks.

There are many different styles of casing available, from simple and understated to ornate and decorative. Some common styles include colonial, craftsman, and Victorian. The choice of casing style will depend on the overall design aesthetic of the building, as well as the personal preferences of the builder or homeowner.

Casing is typically installed after the door or window frame is in place, but before any trim or molding is added. It is often attached with finish nails or adhesive, and may be painted or stained to match the surrounding walls or other trim in the building.