In addition, it is necessary to commemorate that the wood window cannot simply be inserted into the opening, a special casing should be installed between the window and the wall. The casing is also made of wood and is a simple box that is installed around the entire perimeter of the frame. The lower part of the casing is often made much -haired, so that later it plays the role of the windowsill. In addition, the platband is often nailed to its side parts, which can give the house a more accurate and finished look.