Window stop molding is a narrow strip of material used on window frames, primarily serving to limit the movement of window sashes.
Definition and Purpose
Window stop molding, also known as window stop, is a fundamental trim piece applied to the interior (and sometimes exterior) of a window frame. Its main functional purpose is to act as a barrier or "stop" for the window sashes.
According to a reference dated 24-Jan-2022, for windows, stop moulding is used to stop sashes that swing in or out. This means it provides a surface for the sash to rest against when the window is closed, preventing it from swinging past a certain point.
Key Functions
The primary roles of window stop molding include:
- Controlling Sash Movement: It physically stops the sash from moving further than intended, especially relevant for casement or awning windows that swing.
- Holding the Sash: In some window types, particularly older or single-pane designs, the stop molding helps hold the glass pane or sash securely within the frame.
- Aesthetic Trim: Beyond its functional role, stop molding provides a finished look to the window frame, covering the edge where the sash meets the frame.
Location
Window stop molding is typically installed along the interior perimeter of the window frame, right next to the sash. Depending on the window design, it might be on one or multiple sides of the frame.
Common Materials
Window stops are commonly made from materials similar to other interior trim, such as:
- Wood: Paintable or stainable, often matching the window frame.
- MDF (Medium-Density Fiberboard): A cost-effective alternative for painted trim.
- PVC or Vinyl: Durable and weather-resistant, often used on exterior stops or in high-moisture areas.
Understanding window stop molding is key to recognizing how windows are constructed and how their sashes are secured and limited in movement.
