Anatomy of a Window Frame
The window frame surrounds and supports the window pane and can be made of aluminum, fiberglass, wood, or vinyl. Each part of the frame is a distinct component:
1. Head
The horizontal piece at the top of the window frame is called the head.
2. Sill
The window sill is the horizontal bottom piece of the window frame. It is sometimes called a window stool.
3. Jamb
The jambs are the vertical sides of the window frame.
4. Apron
The apron is a decorative piece that is installed below the sill or stool of the window.
5. Weep Holes
Weep holes are openings built into the bottom of metal and vinyl window frames. They allow precipitation that collects in the window tracks to drain off.
Parts of a Window Sash
Your window sash is the moveable part of the window that houses the pane of glass. But it’s much more than just the part that holds the glass. Here are the components of a window sash:
1. Pane
The window pane is the piece, or pieces, of glass in your window.
2. Window Rail
The top and the bottom parts of sashes are called the window rails. Double-hung windows have four rails: two on the top sash and two on the bottom sash.
3. Spacers
Spacers are placed between the panes of glass double and triple-pane windows to help insulate the windows. Window World windows use the Intercept™ warm-edge spacer system to provide superior insulation and extend the life of your windows.
4. Sash Lock
This is the locking mechanism that prevents rattling and keeps your windows secure.
5. Lift
The lift is the handle for lifting and lowering the sash.
6. Weatherstripping
Weatherstripping is placed around the window frame and sash wherever two materials meet. It provides another layer of energy efficiency and protection against the elements.
Additional Window Components
A window is more than a frame and a pane. Here are some other window part names you should know:
Casing
The casing is the molding that goes around the window frames on the exterior of the house. They seal the window frame to the house and prevent outside air from entering your home.
Mullion
A mullion is a structural piece that connects two or more windows together.
Grilles
Grilles are decorative pieces that give a window the appearance of multiple panes of glass.
Fixed Panel
The stationary window pane is referred to as a fixed panel. It is inoperable and is most commonly seen in single-hung windows.
Energy-Efficient Window Terminology
In addition to window parts, the lingo around energy efficiency can be intimidating for the average person. Here is everything you need to know to confidently choose the most energy-efficient window purchase!
Low-E Glass
Low-emissivity (low-E) glass is an energy-efficient glass option. Designed to filter the amount of UV light that enters your home, it helps regulate the amount of heat that enters your home. This helps keep your home’s temperatures more consistent.
Argon Gas
Argon gas is a colorless, odorless gas used as an insulator in double and triple-pane windows. When paired with Low-E glass, it keeps the window closer to room temperature, helping eliminate drafts and increase energy efficiency.
