Whether you are repairing your damaged windows or installing new ones, you need some window parts. Without them, you cannot get the job done. Moreover, knowing the window components keeps confusion at bay.

If you are searching for parts of a window, you have come to the right place. I have had two detailed diagrams. They display the anatomy of the window, frame, and three-pane windows. Scroll through this article to find out parts of the window.

Diagram: Parts of the Window

1. Head

The main horizontal part creates the top of the window frame. It also connects the upper-edge of the window to the wall.

Moreover, the head can serve as a decorative feature. In modern homes, the head is typically painted white.

2. Sash Lock

This locking mechanism can be found on both single-hung and double-hung windows. It allows the homeowner to lock the window safely.

Furthermore, it adds a style to the window. It effectively helps reduce rattling as well.

3. Window Stile

Stiles are the vertical parts in the framework of the window sash. They can be seen on the sides of the window.

4. Interior Casing

The casing is finished trim around the frames of a window. It links the sides of a window with the surrounding wall. Besides, it keeps the cold air from entering your room and improves the look of the window.

5. Muntin

The strip of metal or wood sandwiched between adjacent glass panes. It contributes to the window’s grid appearance. Not to mention, it supports the panes in the window sash.

6. Upper Sash

It is the upper panel of the moveable or fixed framework. In a single-hung design, the upper sash works as the backbone of the window assembly. Since it is stationary, it only lets the sunlight in.

In a double-hung window assembly, the upper sash can be raised, as well as lowered, along the tracks.

7. Lower Sash

The lower panel of the framework holds windowpanes. It normally sits between the eye and hand level. Moreover, it provides outside views and increases airflow. When the user fully opens the lower sash, it entirely covers the upper sash.

8. Side Jamb

The inner frames around the window sash. You can either varnish or color them to call attention to your window.

9. Window Pane

Windowpanes are plates of glass positioned within the frames. They enable you to see the outdoor views.

10. Channel

The plastic or rubber groove around the window. It gives the window a seal.

11. Apron

A raised section or molding that is found below the sill. It poses as a functional and ornamental feature at once.

12. Window Stool

It is known as the interior sill. The stool is the bottom horizontal shelf fixed to a window. It is also used to put the potted plant on.

13. Top Rail

It is the top horizontal framing member of the window sash. This piece sits between two stiles.

14. Bottom Rail

It is a horizontal bar across the bottom of the sash. The lower rail connects the vertical members of the window frame.

15. Exterior Sill

The external horizontal part of the window frame. It is built beneath the glass panes. Additionally, it prevents water intrusion. You need to varnish the sill to make it moisture-resistant.

16. Head Jamb

It is the main horizontal bar across the top of the window sash. It fits between two side jambs.

The Cross-Section of a Three-Pane Window

17. Frame

It is the framework that surrounds the whole window system. It also provides support for the window. Besides, it is used to place the glass panes. The window’s frame can be made of vinyl, wood, aluminum, or fiberglass.

18. Spacer

The spacer is the unit that separates three glass panes of the window. It gives glass layers enough space as well as promotes window insulation. Typically, it is constructed of aluminum.

19. Glass Sealant

It is a silicone product for external sealing around the frames of a window. It can be in the foam, gel, or liquid form. The benefit of using a glass sealant is it enhances energy efficiency in a window.

All the thing you need to do is applying the sealant to the glass surfaces. Then, let it maintain the window’s clean exterior.

20. Air Latch

Latch mechanism positioned on the interior face of the window sash. It keeps the window in a partially open state. As a result, your home has proper ventilation.

21. Sloped Sill

As the name suggests, this exterior member of the windowsill is specifically designed to be sloped downward. Therefore, the water will run off it.

22. Meeting Rail

The horizontal bar where the rails of sashes come in contact when the window is closed. It gives you practicality.

23. Hollow Glass

One of the materials that are used to make the windowpanes. It is not only recyclable but also generates a modern look. You can clean the windowpanes with ease too.

24. Aluminum Bracket

The brackets manufactured from aluminum. They offset the three-pane window from the supporting wall by a few inches.

25. Drain Hole

Small drainage holds positioned on the bottom part of the window frame. It allows the fluids to flow. Besides, it leads to a well-drained window system.

26. Pulley

The machine comes with a wheel and a chain or rope. Make sure you buy the pulleys with sealed ball bearings since they are sturdier.

27. Lower Sash

It is the bottom panel of the movable or fixed window framework. Moreover, it strongly supports windowpane.

28. Bottom Rail

The lower horizontal part of a window sash. It sits between vertical members of a window.

29. Pane

A glass sheet placed within a window frame. The pane holds the top, bottom, left, and right sashes as well.

30. Lift Rail

The handle used to raise the lower sash. Not to mention, it lets the users open and close the window easily.

Windows are such a vital feature of your house. They allow in natural light and provide outside views. That is why you need to install them. After learning about window parts, I believe you can fluently speak with an installation expert.

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