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The Drawing above is a complete Double Hung Wood Window Unit which consists of One Frame and two
Sashes.
The Sashes move up and down and the Frame holds the Sashes in place.

Apron
A piece of interior trim that fits under the Stool. (Usually the same size as the interior
casing)

Blind Stop
Pieces of wood that fit on the outside of the Window Frame and holds the Outer Sash in place.

Brickmould
The outer casing on a window that usually fits against the brick on the exterior of a building.

Head Jamb
The top horizontal part of a Window Frame.

Inner Sash
Also known as the Bottom Sash is the part of a Double Hung Window that holds the glass in place and
moves up and down.

Interior Casing
The decorative trim that goes on the inside of a building. (On both sides and top of the frame)

Interior Stop
Usually a small piece of trim that fits on the inside of the Window Frame and holds the Inner Sash in place.

Lock
The part of a window that keeps the Inner and Outer Sashes from moving up and down for security.

Meeting Rail
Also known as check rail helps the Inner and Outer Sashes meet together and become weatherproof.

Muntin
Also known as Muntin Bar fits inside of a sash to hold the glass in place if there are more than one piece of
glass in the sash. (This is known as TDL or True Divided Lites)

Outer Sash
Also known as the Top Sash is the part of a Double Hung Window that holds the glass in place and moves
up and down.
.
Parting Strip
Pieces of trim usually 1/2" x 3/4" that fits between the Inner and Outer Sashes to hold them in place.

Rail
The horizontal parts of the Window Sashes. (Top Rail,Bottom Rail,Meeting Rail)

Side Jamb
The side vertical parts of a Window Frame.

Sill
The angled bottom part of a Window Frame that helps direct water away from the building.

Stiles
The side vertical parts of a Window Sash.

Stool
A flat piece of trim that goes on the inside of a building on top of the Sill and Apron also fitting against the
inside of the Bottom/ Inner Sash.