The 3 Main Parts Of A Window

Knowing What’s What On Your Window

If you’re ever thinking about getting new windows, it’s important to know how to communicate what you don’t like about your current setup.

You may not like how they do this or that, and of course, you want to make sure your window replacement is an upgrade. Which means you’ve got to know what everything does. To help you learn your window’s anatomy, today we’re describing the different parts of a window.

The Sill

The sill is the inside ledge of a window. You’re likely familiar with the window sill, as it’s an aspect of your window that’s both functional and decorative.

Not only can your window sill hold items like flowers or picture frames, they’re also used to give your windows their depth, which is a hallmark of modern window arrangements.

Some window sills may be deep enough to hold a planter, while others may not be big enough to hold anything at all.

As part of your window’s frame (more on that in a bit), your window sill is integral to the stability of your entire window.

Problems with your window sill are mostly related to exposure to moisture. Because your window sill sits at the base of your window, condensation that collects on the windows may drip down and build up within the sill, causing rot and mold.

The Sash

The sash is a movable panel of a window. It may actually be the sash that most people think of as the “window.”

That could be because if the glass breaks, it’s part of the sash. If it’s a larger window, this will almost certainly be necessary, as having a large single pane of glass might be less stable.

Like the rest of the window, the window sash is susceptible to warping.

And if your window sash warps, it could slowly loosen from the panel and cause the telltale rattle of aged windows. The good news is that many rattly old windows can be tightened up using DIY methods at home.

Your Mullion and Muntin

Sometimes the sash is divided up by muntins. This is more common on larger windows.

The larger the window, the more muntins will be needed. From an engineering standpoint, muntins provide support to the window and spread the load evenly over the entire system.

They also compartmentalize the windows which means if there’s a break, it’s possible to repair a single pane instead of the whole window.

For very large windows, a mullion may be included. A mullion is a large vertical divider that extends the height of the windows. It may be practical to have a mullion on large setups.

Both mullions and muntins can be decorative and used as an accent to a window’s overall theme. Mullions and muntins may be susceptible to moisture penetrating through and causing mold.

More likely, however, is for air to get trapped in between the window panes (if double-paned) and cause the windows to appear foggy.

Cloudy windows are possible with just about any part of a window that contacts the panes.

The Window Panes

Your window pane is the defining characteristic of a window – the glass part.

Modern windows are typically double pane windows-windows with two panes of glass instead of one. Some windows might even be triple pane. Windows feature multiple panes of glass for several reasons:

  • Insulation Windows with multiple panes are much more effective at keeping heat from escaping through.
  • Sound proofing Double and triple-paned windows let much less sound through.
  • Durability Additional panes means additional layers of security, even if they’re just glass.

Because window panes are just single sheets of glass, the worst thing that could happen with them is breakage. With multiple panes of glass, there is a risk of “fogging” between the window panes. You’ve likely seen foggy windows before. It presents as clouded glass and looks like there is steam or condensation on the windows. What’s actually happening, though, is that gases were trapped between panes and

The Window Frame

Your window frame is what holds the window sash. It includes everything from the stationary head window to the jamb and liner, as well as the window sill.

Just about everything except for the movable window sash could be considered the window frame and most experts will know what you’re talking about. Taken as the whole of its parts, your window frame is the strongest part of your window.

If you’ve got questions about any part of your window’s anatomy, don’t hesitate to contact us today.

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