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.

What is an interior window jamb?

Jamb Extensions allow your window to fit the depth of your opening. Jamb extensions are an interior window feature which allows your frame to fit window openings of varying depths. By extending the window jambs to the precise length required, your window is able to sit flush with your interior wall.

Can you replace a window jamb?

The window jamb is located inside of the window framing, and runs along the top frame, and side frames of the window. The piece that runs along the bottom of the frame is called the windowsill. ... If you are a handy person then window jamb repair or replacement is a fairly easy task.