Category Construction Glossary
Types of House Windows
A window having a curved (radius) top and a flat
bottom. The shape of the window is an exact
half-circle with the height being exactly one-half of
the width. Also called circle head, half-circle and
A composite of three or more windows, usually
made up of a large center unit and two flanking
units at 30, 45 or 90 degree angles to the wall.
An angled combination of windows in 3-, 4- or 5-lite
configurations. The windows are attached at
10-degree angles to project a more circular arced
A projecting window with a single sash hinged at the
sides and usually opening outward like a door and
operated by a (crank) handle which turns to open
or close the unit.
A designation given to products whose exposed
exterior surfaces are sheathed with specially
A space which protrudes from the roof of a house,
usually including one or more windows
House Window Term Double Hung Window has
two operable sashes. A wood window normally has
two operating sashes.
Glass with a surface compression of not less than
10,000 psi, or an edge compression of not less
than 9,700 psi. When broken, the glass breaks into
pebbles instead of pieces with sharp edges.
a window with specific release hardware and
minimum clear opening size to allow occupants to
escape through the window in case of a fire
Today, used to identify certain arch-topped or
radius-topped windows that have a curved top like
the shape of a human eyebrow.
A window which is non-operative
The designation given to units that flank a center
picture unit in a double or triple combination or bay
A screen which does not cover the entire opening
of a window. Used on the bottom half of single hung
units and on the operating sash of single sliders.
A combination of two or more panes of glass with
hermetically sealed space between the panes of
glass. This space may or may not be filled with an
inert gas, such as argon. The purpose of bonding
the glass panes in this fashion is to increase the
insulating properties of the glass
A major structural vertical or horizontal member
between window units or sliding glass doors.
Any textured glass (frosted, etched, fluted, ground,
etc.) used for privacy or decorative effects
A window that can be opened for ventilation
A large, arch-top window flanked by smaller
windows on each side.
A large, fixed window framed so that it is usually,
but not always, longer horizontally than vertically to
provide a wide view
House Window Term Single Hung Window is a
window which has only one operable sash. As in an
aluminum window, the only sash that is operable is
the bottom sash.
A fixed, often narrow, glass window next to a door
A window in which the sash move horizontally. Sliders are available in a 2- or 3-lite
configuration, with the 3-lite having operable end vents.
The addition of a thermal insulating material between two thermally conductive materials.
A single or double-hung window whose operable sash can be tilted into the room to be washed.
Glass with a material added to give the glass a light and/or heat reducing capability and color.
A small window that fits over the top of a door or window, primarily for additional light and
True Divided Lite
A term which refers to windows in which multiple individual panes of glass or lights are
assembled in the sash using muntins