About Doors

Anatomy of an entry door
Door Definitions

Astragal:A special molding attached to one of a pair of doors that prevents them from swinging or sliding completely through the opening. Also to prevent air infiltration.

Caming :Caming is the rolled formed metal banding that joins individual pieces of glass together in a decorative glass panel

Casing:Molding of varying widths and thicknesses used to trim out interior or exterior door openings.

Door Frame:A complete door frame consists of one header and two jamb legs. A strip of wood called a “stop” keeps the door from swinging through the frame. Stops are available rabbetted (Built-in) or Stitched (applied separately with staples).

Door Jamb:The part of a door frame which surrounds and contacts the edges of the stiles and top rail of a door. Jambs may be classified as (1) “head’ or “side” jambs and (2) “plain” or “rabbeted”.

Door Panel:A sheet of thin lumber, plywood or composition material inserted into the frame formed by the stiles, rails and mullions of a door.

Door Rails:Doors can be manufactured with double rails on the top and/or bottom so the door can be field-trimmed for off-square replacement installations.

Door Skin:The front or face panel (usually two or more plies) of a flush door.

Exterior Threshold:A threshold non-symmetrically beveled, (the more gradual and longer bevel facing the exterior) which, when secured to the exterior door frame sill and/or finished floor, prevents water from driving under the door.

Flexible Sweep:A rubber or vinyl strip that easily bends and is applied to the bottom of a door to create an effective seal against the sill (threshold).

French Door:An interior or exterior door consisting of stiles, top and bottom rail and divided glass panels or lights. Often used in pairs and can be referred to as casement or terrace doors.

Head Casing:The horizontal casing across the top of the window or door opening.

Hinge Jamb:Side jamb in which the door hinges (butts) are applied.

Hinged Door:An exterior or interior door hung by attaching butts to the stile so that the door swings on a vertical axis. These doors may be single (swinging thru 90 degrees) or double-acting (swinging thru 180 degrees). Double-acting doors do not require a door stop.

Jamb:The top and two sides of a door or window frame which contact the door or sash: top jamb and side jambs. The most common size for interior use is 11/16” thick by 4-9/16” wide.

Mullion:The upright or vertical member dividing the panels in a door. A mullion is also the vertical member of a sash, window or door frame between openings in a multiple opening frame. The mullion is known as the ‘mullion center’. Frames are termed ‘mullions’, ‘’triples’, or ‘quadruples’, depending on whether they have one, two or three mullions respectively. They are sometimes referred to as ‘muntings’.

Rail:The cross or horizontal pieces of a door’s framework of: "top rail," "mullion rail," "lock rail," and "bottom rail" are different types of rails based on their location in the structure of the door.

Sidelite:An assembly of stiles and rails, with or without a wood panel containing a single row of glass panels or lights. Installed on one or both sides of an exterior door frame, especially a front entrance door frame.

Sidelights provides light, especially for an entry hall, as well as decorative appeal

Stile:The upright or vertical framework pieces of a door

Strike Jamb:Jamb opposite the hinge jamb. A jamb on which the lock or passage-set strike plate is installed.

Top Rail:Upper most horizontal member of a sash, door, blind or other similar panel assembly.

Transom:A horizontal member separating a door from a window panel above the door, or separating one window above another

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