GLASS GLOSSARY OF TERMS
Standard float (plate) glass.
Has a top hinge and swings outward from the bottom for ventilation.
An inert, nontoxic gas used to fill insulating units for improved thermal performance.
The use of springs or weights to hold a vertical sash in any desired position.
An arrangement of three or more individual window units attached to each other. In a typical three-unit bay, a center section usually remains fixed while the two on either side act as individual casements.
A glass curved through a special process.
The process by which an edge of glass is finished to an angle so that the edge is not perpendicular to either face of the glass.
A piece of neoprene, silicone, or other suitable material used to position glass in a frame.
A bow window can be arranged with three or more equal width units. They can be fixed or operable or mixed in any combination. They are usually mulled together with a small angle such as 13 degrees.
A synthetic rubber that can be used both as a sealant and architectural glazing tape.
A piece that connects with the keeper mechanism to keep the window sashes together when locked.
A window unit in which the single sash cranks outward to the right or left.
A putty-like compound used to block exterior air or moisture leaks where two surfaces meet and have minimum movement. Large cracks can be stuffed with mineral wood and weather sealed with caulking.
Condensation resistance factor:
A measure of the effectiveness of a window to reduce condensation. A higher number means better efficiency.
An exterior building wall which carries no roof or floor loads. It consists entirely of metal, or a combination of metal, glass and other surfacing materials supported by a metal framework.
A piece of glass with a sash around it.
Two panes of glass enclosing a hermetically-sealed air space.
A window consisting of two sashes of glass operating in a rectangular frame, both the upper and lower halves can be slid up and down and usually use a counter balance mechanism to hold the sash in place.
A method of securing glass in a frame by use of a dry, preformed resilient gasket, without the use of a compound.
A law requiring a minimum opening of a window for persons to exit or firefighters to enter.
Patterns or designs cut into glass either by acid etching or needle etching techniques.
A window which is stationary, also known as a picture window. Can also refer to: the part of a sliding window or door which is non-moveable, also known as inactive.
Glass which has its bottom surfaces formed by floating on molten metal, the top surface being gravity formed, producing a high optical quality of glass with parallel surfaces and, without polishing and grinding, the fire-finished brilliance of the finest sheet glass. Float is replacing plate glass.
A method of glazing wherein the surfaces of the glass retaining members (stops or beads) are in the same plane normal to the glass as the side faces of the frame members; often achieved by providing pockets in these faces
A deposit of contamination left on the inside surface of the sealed insulating glass unit due to extremes of temperatures. Fogging ultimately resulting in seal failure.
Pre-formed glazing materials used for bedding or securing glass and for separating glass from the frame.
Specially designed to create rectangles, triangles, half-rounds, full-rounds, ellipses and more
Buys glass and installs it on a “contractor” basis. Examples: installing the window system in large office buildings, shopping center malls, etc.
The process of installing glass in a frame.
A soft dough-like material used for filling and sealing the space between a pane of glass and its surrounding frame.
The horizontal portion at the top of the main window frame.
A u-shaped piece of vinyl placed on the head of a window to be used as filler. This piece will expand or lengthen a unit and fill a gap.
Glass which is reheated, after forming, just below melting point and then cooled. A compressed surface is formed which increases its strength. Used for spandrel glass.
Hermetically sealed unit:
An insulating glass unit made up of two lights of glass, separated by a roll formed aluminum spacer tube (at the full perimeter) which is filled with a moisture absorbing material. The unit is then completely sealed, creating a moisture-free, clean dead air space
The pane of a double-glazed unit which faces the interior of a building.
Insulating glass refers to two pieces of glass spaced apart and hermetically sealed to form a single-glazed unit with an air space between. Heat transmission through this type of glass may be as low as half that without such an air space. It is also called double glazing.
Glass set from the interior of the building.
Used around the exterior of a window where the siding fits. It extends beyond the window to the outside edges of an adjoining j-channel.
Made up of horizontally mounted louvered glass that abut each other tightly when closed and extended outward when cranked open.
The vertical parts of the frame on both sides of the window.
An odorless and colorless gas that replaces air between two or more glass panes. Krypton is denser than air and works better to deter heat transfers.
Two or more sheets with an inner layer of transparent plastic to which the glass adheres if broken. Used for overhead, safety glazing, and sound reduction.
Another term for a pane of glass used in a window.
The horizontal part of a sash where the cam lock is attached.
Low-e coatings are generally neutral in appearance and designed to reduce heat loss through the glass from inside the building. The coating reflects long-wave energy and subsequently reduces the u-value of the glass. Low-e coatings may also be incorporated into solar control coatings to provide both benefits of retaining heat in the building and reflecting heat from the sun providing improved energy control.
Includes the head, sill and jambs of a window.
An intermediate-connecting member used as a means to “join” two or more window products together in a single rough opening.
A small bar that divides window or door glass.
Any type of glass with uneven surfaces which offers light diffusion and privacy.
The pane of double-glazed unit which faces the exterior of a building.
A light or sheet of glass.
Presents uneven surfaces with different impressed patterns.
Stationary and framed so that it is usually, but not always, wider than it is tall to provide a panoramic view.
Polished plate glass is a rolled, ground and polished product with true flat parallel plane surfaces affording excellent vision. It has less surface polish than sheet glass and is available in thickness varying from 1/4″ to 1-1/4″. Now replaced by float glass.
Refers to a unit that is vertically level.
Adding or replacing items to existing buildings. Typical retrofit products are replacement doors and windows, insulation, storm windows, caulking, weatherstripping and vents landscaping.
Visible light transmittance:
A percentage of light that is transmitted through glass. The higher the number the more light is transmitted through the window.
Glass which must have passed an impact test and either must not break or must break safely.
Creating designs on the surface of glass by using high-pressure air mixed with sand applied to the surface of glass to carve texture.
The portion of a window which includes the glass and the framing sections which are directly attached to the glass. Not to be confused with the master frame into which the sash sections are fitted.
Narrow fixed units mulled or joined to door units to give a more open appearance.
A polymeric organic compound offering excellent resistance to cold, heat and water.
The use of single thickness of glass in a window or door.
A term used to describe glass with a defined thickness (2.16-2.57 mm).
A slider window may have one or two movable panes of glass. Whatever the type, the windows slide horizontally in the frame.
The area of glass panels that conceal structural building components such as columns, floor slabs, heating, ventilating and air conditioning (hvac) systems, electrical wiring and more.
The vertical parts of a sash.
Tempered glass is two or more times stronger than annealed glass. When broken, it shatters into many small fragments, thus preventing major injuries. Also known as “toughened glass.”
Three panes of glass enclosing two hermetically-sealed air spaces.
A window located directly above a door opening.
Refers to how much heat passes through the glass. The lower the u-value, the better the insulating quality.
A measure of the percentage of ultraviolet rays blocked from being transmitted through the glass. A higher uv block indicates that fewer rays are transmitted through the window.
Holding glass in place with extruded vinyl channels or roll-in type.
Uses a silicone-based substance to secure and seal glass to a sash.
Small openings on the exterior sill designed to allow water that might otherwise accumulate in a window’s sill to escape.
Weep holes covered with vinyl to let water escape while keeping bugs out.
The pressure acting on an external surface of a building caused by the direct action of the wind.
A metal curtain wall of the commercial type, in which windows are the most prominent element. Also refers to smallest fixed lights used with wall systems.
Polished or clear glass that is 1/4″ thick. Wire mesh is embedded within the glass such that the glass will not shatter when broken. The wire pattern is available in many types. It is frequently used in skylights, overhead glazing and locations where a fire-retardant glass is required.
Paul Rabinowitz Glass is a commercial glass installation, maintenance and repair business, located in Philadelphia, PA. www.rabglass.com