labeled photo diagraming the parts making up a common wood window
Photo: Andrew McCaul
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Anatomy of a Double-Hung

The most popular window in the U.S., it has the same basic parts as other types.

Sash
Movable or fixed frame that supports the glazing.

Casing
Trim that covers the gap between the jambs and house framing.

Sill
Bottom part of the frame; angled to shed water.

Jambs
Sides and top of the frame that surround the sashes.

Glazing
Window glass.

Muntins
Slender strips that divide the glazing.

Sash Lock
Hardware that secures the top and bottom sashes.
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