What Is a Jamb on a Window

Jambs are the main vertical parts forming the sides of a window frame. Sill. A sill is the main horizontal part forming the bottom of the frame of a window. Jambliner. A jambliner is a strip which goes on the sides of a window frame that provides a snug fit for the window sash.

Do I need a window jamb?

Jambs often house tracks or rails used to manipulate operational windows. They also support latches and hardware that are used to lock the window when it is closed. Jambs are not necessarily required but are commonly used by most window manufacturers.

Where is the head jamb of a window?

A head or head jamb is the vertical component that sits at the very top of the window frame. The window sash seats against it.