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Parts of a Window


Many people are familiar with different types of windows, but the anatomy of your window is also important. One of the main benefits of knowing the parts of a window is understanding how the different parts work together. There are many different parts of a window, and they differ from one type of window to another.

Parts of a Window

This guide reviews the different parts of several windows and their respective functions. You also get to know where these parts are found in various window types. Whether you are installing windows in your sunroom or other areas of the home, all windows have similar parts.

Window AnatomyParts of a Window

Every window features a framework; this refers to the part that surrounding the entire window. The framework consists of jambs, a seal and a head. The sill refers to the horizontal piece that makes up the frame’s bottom part. The jambs refer to the vertical sides making up the right and left portions of the frame while the head is the horizontal piece making up the window frame’s top. Then, of course, there are the glass panes.

Understanding the Parts of a Window

While the parts mentioned above are common on all windows, certain types of windows have parts that are unique to themselves. Here are a few popular types of windows and their respective parts.

Double-Hung Windows

Double-hung windows contain probably the most parts of any type of window. A double-hung window will have a sash, the movable part of the window that opens and closes. The sash also has several components. The rails refer to the lower and upper horizontal pieces of the sash. The check rail is the part where the upper part of the lower sash and the bottom part of the upper sash come in contact in the middle of the window system.

Double-hung windows also have a lift (the handle used for opening and closing the window) as well as a sash lock, which is a locking mechanism that secures the window in place. There’s also the balance, a spring-loaded mechanical device, that counterbalances the weight of the sash being opened.

Casement WindowsParts of a Window

Casement windows open either to the left or right using an operator (a hand crank). Locking a casement window involves closing it shut with a lock handle that’s usually installed on the jamb. The casing is typically made of vinyl and refers to the molding around the window that covers the space between the wall and the jamb or frame.

Casement windows have some weather-stripping material covering the joint between the sash and the frame, which acts as insulation and helps to prevent water or air from getting into the home.

Stationary Windows

Stationary windows don’t open, which explains why they have minimal parts. However, they do contain parts that other windows don’t typically contain. For instance, they have a fixed panel of glass. Some stationary windows have decorative pieces known as grids, which are used to divide large pieces of glass that resemble several smaller windows.

Bottom Line

Knowing the different parts of a window goes a long way in helping you to understand how windows work and the functions of the different parts. Now that you’re familiar with the components of a window, you’re better equipped to choose the type of window that best suits your needs and preferences.