Understanding Window Anatomy for Your Replacement Project

Installing new windows can refresh your home. When you are browsing for replacement options, it is helpful to first know the anatomy of a window to guide you through the process. Understanding all of the parts and how they function together can help you find which window works best for you. Single and double-hung windows are the most common types of windows installed in homes. For that reason, we will use them as a guide. These windows can be broken down into glass panes and components of their interior and exterior frames.

Glass Panes

The pane of glass is perhaps the most notable part of a window. It is also known as glazing and sits inside of the exterior frame and interior sash. There are a lot of different options for window glass, such as obscured, tempered, low-E, and stained.

Exterior Frame

The exterior frame is what surrounds and supports the window from the outside. Frames can be made from a variety of materials, most notably vinyl, aluminum, wood, or metal. Each frame is made up of the head, jamb, jambliner, and sill.

Head

The head is the horizontal element that forms the top of the frame. It is made up of a series of smaller parts, including siding, sheathing, casing, drip cap, and blind stop.

Jambs

Opposite the head, the jambs are vertical parts that create the sides of the window frame. They support the frame as it moves up and down to open and close.

Jambliner

The jambliner is a strip on the sides of the window. It creates a snug fit that holds the sash inside of the frame.

Sill

The window sill is the horizontal component that forms the bottom of the exterior frame. The sill supports the structure of the window by holding it in place. It is shaped like a ledge to lead water away from the building when it rains. When the sill is on the interior of the window, it is called a stool.

Interior Frame Sash

Sash is the term used to describe the interior window frame. It is the part of the window that opens and closes, holding the glass panes in place. It is broken up into two components, the rails, and the stiles. It can also be further broken up into muntins and grilles. A single-hung window has two sashes, one that is fixed and one that is operable.

Rails

The rails of a sash are the horizontal parts. When two rails meet in the middle of a window, it is known as check rails.

Stiles

The stiles of a sash are the vertical components whose primary function is to support the glass in the frame.

Muntins/Grilles

The sash can be subdivided beyond rails and stiles to give it the appearance that it is made up of multiple smaller panes. These horizontal and vertical components are called muntins and grilles. They are an optional addition to your window and can be removed for easy glass cleaning.

Installing New Windows With The Window Depot

Now that you understand the anatomy of a window, the next step is to check out your options. At The Window Depot, we have a variety of window styles made from high-quality materials. We can help you find the perfect fit for your home. To learn more about our window replacement options, contact us today.