Anatomy of a Window
Jambs: The window frame members which compose the top, sides and bottom (sill) of a unit.
Glazing: The glass panes or lights in the sash of a window. Also the act of installing lights of glass in a window sash.
Grille: Ornamental or simulated muntins and bars which don’t actually divide the lights of glass. They fit on the inside of the sash against the glass surface for easy removal. They can also be secured to the exterior of the sash.
Side Jamb: The window frame members which compose the top, sides and bottom (sill) of a unit.
Sill: Horizontal member that forms the bottom of a window frame.
Lower Sash: The framework holding a glass in the window unit. Composed of stiles (sides) and rails (top and bottom)
Upper Sash: The framework holding a glass in the window unit. Composed of stiles (sides) and rails (top and bottom).
Frame: Outside member of window unit which encloses the sash, composed of side jambs, head jamb and sill.
Cladding: A material secured to exterior or interior faces creating a more durable, low-maintenance surface.
Weatherstripping: Metal, plastic or felt strips designed to seal between a window sash and frame or stops to prevent air and water leakage.
Exterior Jamb Groove: Flat wood parts which are fastened to the inside edges of the window jamb to extend it in width and adapt to a thicker wall. The inside edge of extension jambs should be flush with the finished wall surface: the inside casing is then secured to it.
Insulating Glass: A combination of two or more panes of glass with hermetically sealed air space between them. This space may or may not be filled with an inert gas. Insulating glass with a special low emissions coating to restrict the flow of the radiant heat is called Low-E insulating glass.
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