The amount of air leaking in and out of a building through cracks in walls, windows and doors.
Standard sheet of float glass which has not been heat-treated.
An inert, nontoxic gas used in insulating glass units to reduce heat transfer.
An astragal is a piece of hardware that is used on a pair of doors to seal the gap between the doors when they are closed. Astragals are different from a mullion because the astragal is fastened to the door itself. A mullion is attached to the frame and the doors stop against it..
Window similar to a casement except the sash is hinged at the top and always swings out.
An abbreviation for British Thermal Unit, the heat required to increase the temperature of one pound of water one degree Fahrenheit.
A mechanical device (normally spiral, spring-loaded) used in single- and double-hung windows as a means of counterbalancing the weight of the sash during opening and closing. Other types include block and tackle, cords with weights, springs and coils.
An arrangement of three or more individual window units, attached so as to project from the building at various angles. In a three-unit bay, the center section is normally fixed, with the end panels operable as single-hung or casement windows.
The bottom horizontal member of a window sash.
A rounded bay window that projects from the wall in an arc shape, usually consisting of 4 or more windows.
A standard milled wood trim piece that covers the gap between the window frame and masonry.
A single point locking mechanism that uses a cam action to lock and pull the window sash against the frame to form a tighter seal. Large windows may have more than one cam lock.
A window sash that swings open on side hinges.
Exposed molding or framing around a window or door, on either the inside or outside, to cover the space between the window frame or jamb and the wall.
A mastic compound for filling joints and sealing cracks to prevent leakage of water and air, commonly made of silicone, bituminous, acrylic, or rubber-based material.
A 2 panel patio door system with the operable panel hinged from the center of the door.
The bottom horizontal member of the upper sash and the top horizontal member of the lower sash which meet at the middle of a double-hung window.
A window in the upper part of a lofty room that admits light to the center of the room.
The deposit of water vapor from the air on any cold surface whose temperature is below the dew point, such as a cold window glass or frame that is exposed to humid indoor air.
Heat transfer through a solid material by contact of one molecule to the next. Heat flows from a higher-temperature area to a lower-temperature one.
A heat transfer process involving motion in a fluid (such as air) caused by the difference in density of the fluid and the action of gravity. Convection affects heat transfer from the glass surface to room air, and between two panes of glass.
The visible area of glass in a window or door.
The temperature at which water vapor in air will condense at a given state of humidity and pressure.
A window opening divided into smaller sections by a grid system on the interior or exterior of the glass, or between the glass panes.
In general, two thicknesses of glass separated by an air space within an opening to improve insulation against heat transfer and/or sound transmission. In factory-made double glazing units, the air between the glass sheets is thoroughly dried and the space is sealed airtight, eliminating possible condensation and providing superior insulating properties.
A window consisting of two sashes operating in a rectangular frame, in which both the upper and lower halves can be slid up and down. A counterbalance mechanism usually holds the sash in place.
Sheet glass between 0.115" and 0.133" (3-3.38 mm) thick.
Fire escape window large enough for a person to climb out. In U.S. building codes, each bedroom must be provided with an exit window. The exact width, area, and height from the floor are specified in building codes.
The process of producing vinyl or aluminum shapes by forcing heated material through an orifice in a die. Also, any item made by this process.
Windows with a shallow arched head with the arch using only a section of a circle radius. These are different from an ellipse or a half-circle. Can be made with or without extended legs.
An inoperable panel of a sliding glass door or slider window.
A window with no operating sashes. See Picture Window.
Sheet metal or other material applied to seal and protect the joints formed by different materials or surfaces.
Glass formed by a process of floating the material on a bed of molten metal. It produces a high-optical-quality glass with parallel surfaces, without polishing and grinding.
A deposit of contamination left on the inside surface of a sealed insulating glass unit due to extremes of temperatures or failed seals.
The fixed frame of a window which holds the sash or casement as well as hardware.
A style of door in which 2 panels open to provide a clear opening almost as wide as the door frame.
A gas other than air, usually argon or krypton, placed between window or skylight glazing panes to reduce the U-factor by suppressing conduction and convection.
Windows of various shapes including: triangles, trapezoids, octagons, and pentagons.
An inorganic transparent material composed of silica (sand), soda (sodium carbonate), and lime (calcium carbonate) with small quantities of alumina, boric, or magnesia oxides.
The glass or plastic panes in a window, door, or skylight.
A molding or stop around the inside of a window frame to hold the glass in place.
The upper horizontal member of a window frame. Also called head.
The transfer of heat from outside to inside by means of conduction, convection, and radiation through all surfaces of a house.
The transfer of heat from inside to outside by means of conduction, convection, and radiation through all surfaces of a house.
Window glass containing chemicals (with gray, bronze, or blue-green tint) which absorb light and heat radiation, and reduce glare and brightness. See also Tinted glass.
Windows (casement, awning, and hopper) with an operating sash that has hinges on one side. See also Projected window.
A window with a movable panel that slides horizontally.
Two or more pieces of glass spaced apart and hermetically sealed to form a single glazed unit with one or more air spaces in between. Also called double glazing.
See U-factor.
Construction materials used for protection from noise, heat, cold or fire.
An upright frame member of a panel in a sliding glass door which engages with a corresponding member in an adjacent panel when the door is closed. Also called interlocking stile. Also the check rails of single and double hung windows.
Window made up of horizontally-mounted louvered glass slats that abut each other tightly when closed and rotate outward when cranked open.
A vertical member at the side of a window frame, or the horizontal member at the top of the window frame, as in head jamb.
A condition that exists when a surface is exactly horizontal.
Handle for raising the lower sash in a double-hung window. Also called sash lift.
A window; a pane of glass within a window. Double-hung windows are designated by the number of lights in upper and lower sash, as in six-over-six. Also spelled informally lite.
A horizontal member above a window or door opening that supports the structure above.
Invisible radiation, beyond red light on the electromagnetic spectrum (above 3.5 micro meters), emitted by warm surfaces such as a body at room temperature radiating to a cold window surface.
An assembly of materials designed to reduce heat transfer at the edge of an insulating window. Spacers are placed between the panes of glass in a double- or triple-glazed window.
Microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radiative heat flow. A typical type of low-E coating is transparent to the solar spectrum (visible light and short-wave infrared radiation) and reflective of long-wave infrared radiation.
The part of a sliding glass door, a sliding window, or a hung window where two panels meet and create a weather barrier.
2 or more windows structurally joined together to fit into one rough opening
A major structural vertical or horizontal member between window units or sliding glass doors.
National Fenestration Rating Council.
An integral extension of a window or patio door frame which generally laps over the conventional stud construction and through which nails are driven to secure the frame in place.
Window that can be opened for ventilation.
Crank-operated device for opening and closing casement or jalousie windows.
One of the compartments of a door or window consisting of a single sheet of glass in a frame; also, a sheet of glass.
A major component of a sliding glass door, consisting of a light of glass in a frame installed within the main (or outer) frame of the door. A panel may be sliding or fixed.
A large, fixed window framed so that it is usually, but not always, longer horizontally than vertically to provide a panoramic view.
The component on the bottom corner of an operable sash in a single or double hung window that allows the sash to be tilted in.
A rolled, ground, and polished product with true flat parallel plane surfaces affording excellent vision. It has been replaced by float glass.
A condition that exists when a surface is exactly vertical.
An extruded or molded plastic material used for window framing and as a thermal barrier for aluminum windows.
A measure of how well a barrier such as a layer of insulation, a window or a complete wall or ceiling, resists conductive flow of heat. It is the inverse of the U-factor (R=1/U). R-values measure the thermal resistance of a barrier's exposed area. The greater the R-value, the greater the resistance, and so the better the thermal insulating properties of the barrier. R-values are used in describing effectiveness of insulating material and in analysis of heat flow across assemblies (such as walls, roofs, and windows) under steady-state conditions.[6] Heat flow through a barrier is driven by temperature difference between two sides of the barrier, and the R-value quantifies how effectively the object resists this drive.
The transfer of heat in the form of electromagnetic waves from one separate surface to another. Energy from the sun reaches the earth by radiation, and a person's body can lose heat to a cold window or skylight surface in a similar way.
Horizontal member of a window sash.
The percentage of moisture in the air in relationship to the amount of moisture the air could hold at that given temperature. At 100 percent relative humidity, moisture condenses and falls as rain.
Adding or replacing items on existing buildings. Typical retrofit products are replacement doors and windows, insulation, storm windows, caulking, weatherstripping, vents, landscaping.
The space between the window sash or door panel and the frame.
The opening in a wall into which a door or window is to be installed.
A strengthened or reinforced glass that is less subject to breakage or splintering.
The portion of a window that includes the glass and the framing sections directly attached to the glass, not to be confused with the complete frame into which the sash sections are fitted.
Woven mesh of metal, plastic, or fiberglass stretched over a window opening to permit air to pass through, but not insects.
A compressible plastic material used to seal any opening or junction of two parts, such as between the glass and a sash, commonly made of silicone, butyl tape, or polysulfide.
A measure of the ability of a window or skylight to transmit solar heat, relative to that ability for 1/8-inch clear, double- strength, single glass. It is being phased out in favor of the solar heat gain coefficient, and is approximately equal to the SHGC multiplied by 1.15. It is expressed as a number without units between 0 and 1. The lower a window's solar heat gain coefficient or shading coefficient, the less solar heat it transmits, and the greater is its shading ability.
A transparent, flat glass found in older windows, now largely replaced by float glass.
Invisible radiation, just beyond red light on the electromagnetic spectrum (between 0.7 and 2.5 microns), emitted by hot surfaces and included in solar radiation.
The lowest horizontal member in a door, window, or sash frame.
The track provided at the sill of a sliding glass door. Also, the sill member incorporating such a track.
Single thickness of glass in a window or door.
A window consisting of two sashes of glass, the top one stationary and the bottom movable.
Glass with thickness between 0.085" and 0.100" (2.16-2.57 mm).
A roof window that gives light and ventilation.
A door fitted with one or more panels that move horizontally on a track and/or in grooves. Moving action is usually of rolling type (rather than sliding type). Also called gliding door, rolling glass door, and patio sliding door.
A window fitted with one or more sashes opening by sliding horizontally or vertically in grooves provided by frame members. Vertical sliders may be single- or double-hung.
The fraction of solar radiation admitted through a window or skylight, both directly transmitted, and absorbed and subsequently released inward. The solar heat gain coefficient has replaced the shading coefficient as the standard indicator of a window's shading ability. It is expressed as a number between 0 and 1. The lower a window's solar heat gain coefficient, the less solar heat it transmits, and the greater its shading ability. SHGC can be expressed in terms of the glass alone or can refer to the entire window assembly.
The total radiant energy from the sun, including ultraviolet and infrared wave lengths as well as visible light.
The intensity variation of sunlight across its spectral range.
12805 E 31st Street Tulsa, OK 74146
6405 NW 23rd Street Bethany, OK 73008
8808 Empress Row Dallas, TX 75247
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