Window Mullions vs. Muntins: A Comprehensive Guide
Understanding the Terminology
Window mullions and muntins are architectural features that divide windows into panes. While they both serve a similar purpose, there are subtle differences between them.
Window Muntins
Muntins are the vertical dividers that separate glass panes in a classic multi-pane window assembly. They are typically used in older windows and add a decorative touch. Historically, muntins were necessary for structural support, but with the advent of larger glass panes, they are now primarily used for aesthetics.
Window Mullions
Mullions are the single vertical bars that separate two sides of a single window. They are often heavier than muntins and can give the appearance of creating two windows where one window would be expected. Mullions were traditionally used to support larger expanses of glass, but like muntins, they are now primarily used for decorative purposes.
The Decline of Paned Windows
After World War II, the use of mullions and muntins declined as larger expanses of tempered plate glass became available. Paned windows were no longer necessary for structural purposes, and they became associated with old-fashioned design.
Window Grilles: The Modern Alternative
Today, window grilles are used to simulate the look of muntins and mullions. They are typically made of thin strips of aluminum or plastic and are either sandwiched between double-paned glass or affixed to the outside of the glass. Window grilles add a traditional touch to modern windows and can be used to equalize window styles throughout a house.
Pros and Cons of Window Grilles
Pros:
- Traditional look
- Easy to clean (between-glass grilles)
- Equalize window styles
Cons:
- Permanent (between-glass grilles)
- Expensive
- Not authentic
Choosing the Right Window Grilles
When choosing window grilles, consider the style of your home and the desired level of authenticity. Between-glass grilles offer a permanent solution but can be expensive. Clip-on grilles are less expensive and can be removed for cleaning. Retrofit grille kits allow you to build your own grilles from adjustable stiles and connectors.
Additional Considerations
- Adding Mullions: It is easy to add mullions, or grilles, to windows. Window companies can deliver your windows with them added on for an extra fee, or you can install them yourself.
- The Difference Between Mullions and Muntins: The difference between the two terms is slight. Muntins supported multiple panes of glass, while mullions supported two panes. Today, the terms are often used interchangeably to refer to decorative window dividers.
- The Name for Grids in Glass Windows: The grids in old-fashioned-looking windows are also known as muntins, mullions, grids, and grilles.
- Can You Add Mullions to Windows: Yes, it is very easy to add mullions, or grilles, to windows.
By understanding the differences between window mullions and muntins, you can make informed decisions about the design and style of your windows. Whether you choose traditional paned windows, modern grilles, or a combination of both, these architectural features can add character and value to your home.