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Anatomy of A Door System

Today’s entryway doors are fully integrated systems designed to provide problem-free performance and an attractive appearance.

To understand how these doors function, it is important to know what components go into a typical door system and the role that each plays.

Here are descriptions of many of the key components of a door system, courtesy of Therma-Tru, the nation’s largest manufacturer of fiberglass and steel exterior doors:

Brick mould: The decorative molding used to finish the exterior face of a wood frame at the wall joint.

Casing: The interior trim molding around the door opening that covers the gap between the frame or jamb and the wall.

Doorlites: Decorative glass assemblies that are fitted into the door for added beauty and sunlight.

Sidelites: Fixed or assemblies that are attached adjacent to the door frame.

Transom: The decorative glass assembly that is installed above the door frame.

Drip Cap: A horizontal molding placed above the door to divert water away from the door frame.

Frame: The wood structure that encloses and supports the entire door system.

Insulated Foam Core: A material blown into fiberglass and steel doors to reduce their ability to conduct both heat and cold.

Hinge: The metal plate mounted on the door frame that anchors the door to the frame and allows the door to open and close freely.

Jamb: Vertical side and head trim that enhances the aesthetics of the frame assembly.

Panel: The raised or recessed, decorative section of a door that produces deep shadow lines.

Sill: The horizontal bottom frame of a door that supports the weight of the entire door system.

Weatherstripping: A fixed or adjustable seal along the edge of the door frame that keeps water, air and sound from penetrating a home.

Sweep: A weatherstripping attached to the bottom of the door.

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