A window with a sash that is hinged at the top and opens from the bottom.

A bay window is made up of three or more windows. The side or flanker units project out from the building in 30°, 45°, or 90° angles. The center is parallel with the building wall and is made up of one or more windows. All the units can be stationary, operating, or any combination of the two. Typically, the center section is stationary, while the side units are operating.

A series of four or more adjoining window units, commonly five in number that project 10°-20° from the wall of the building, forming a radius.

A form of exterior casing for windows and doors that serves as an aesthetic boundary between the siding and the frame.

A single-point locking mechanism that uses a “cam” action to lock and  pull the window sash against the frame, forming a tight weather seal. Large windows may have more than one cam lock.

The pins on the bottom corners of single and double-hung sashes that engage the balance and also allow the sash to “pivot” for easy removal and reinstallation.

A window that opens from the side like a door. Historically, casements were the first working windows. They were strategically placed throughout a house to capture breezes and direct them through the rooms. Screens are hung internally to prevent bugs and dirt from entering the house.

The trim around door and window openings. Interior casing is shaped, decorative molding that covers the inside edges of the jambs and the rough opening between the window unit and the wall. Exterior casing is an alternative to brickmold.

A window opening divided into smaller sections by a grid system on the interior or exterior of the glass, between the glass panes, or any combination of these three.

The trim around an interior or exterior door. Exterior door casings are installed only on the outside of exterior door frames, especially on wood facing wood-frame exterior walls. Interior casing covers the inside edges of the jambs and the rough opening between the door unit and the wall.

The assembly of structural members (head, sill, jambs) used to fasten the door system to the structure.

The upper horizontal and two vertical frame members that house the door panel. Jambs may be classified as head or side jambs.

An assembly comprised of stiles (vertical pieces), and rails (horizontal pieces) inserted into the door frame.

Two panes of glass separated by an air space to form insulating glass. Double glazing may also be accomplished by adding a storm panel.

A window with two sashes, upper and lower, that slide vertically past each other.

A window-opening mechanism used on casement windows. It is composed of two arms; one pulls the sash while the other pushes.

A door that serves as the main entrance of a structure. It may be single or paired.

A form produced by forcing material through a die.

A joint between two pieces created by machining a series of interlocking groves. It is used to create a longer section of wood. The joints are firmly held in place with an adhesive.

The final, protective treatment of a surface (paint, stain, etc.).

Refers to a window or door that is non-venting or inoperable.

A door panel consisting of a flat piece of plywood, solid wood or other material in contrast to a raised door panel

A door consisting of a core, cross-banding and flat-face veneers, or a door consisting of a core and flat-face veneers only.

The assembly of structural members (head, sill, jambs) used to fasten a window sash or a door panel to a structure.

A style of door in which two panels open to provide a clear opening which is approximately twice as wide as one panel. In the 19th century, glass was added to door construction, mainly in French and German homes, on internal doors leading to rooms containing more natural light, such as conservatories, glass houses and vestibules.

The process of mounting glass into windows and doors. Glazing also refers to the lowest quality of plate glass. The purpose of glazing is to retain the glass adequately under the design load, provide an effective weather seal, prevent loads or pressure points on the glass resulting from building movement, prevent glass-to-metal contact, and minimize glass breakage from mechanical or thermal stress. An insulating glass (IG) unit is two glass panes separated by a spacer and sealed. IG glass is offered in clear (no special coating) and high performance, which has a special low-emissive coating for exceptional energy efficiency.

A jointed or flexible device on which a door or window turns. The earliest known hinges were T-shaped devices called strap or cross-garnet hinges. They were made of wrought iron with a crossbar fixed vertically to the door frame, and attached with nails to the door. In the 18th century, hinges for interior doors were H-shaped or L-shaped, and attached to the door with nails.

Two or more sashes that slide horizontally past each other. One or more of the sashes may be fixed or inoperative or all the sashes may operate. In a closed position, the sash come together to form a vertical meeting rail.