The amount of air that passes through between a window sash and frame
or a door panel and frame.
All high performance windows have
at least two panes of glass sandwiched
together, with an airspace in between.
size of the airspace effects the overall window performance.
A 1/2" to 3/4" space is considered
Vinyl inserts are added in the main frame of the slider
window to prevent
the operating sash from being removed unless it is in the full open position.
A gas and air constituent used to fill insulated units to increase
A window that hinges on the jambs, locks on
the sill and projects
out from the bottom when in an open position.
Spring loaded single hung vent support system.
A window that projects
outward from the wall of a building.
Bays usually contain three windows in 30° and 45° configurations
mounted with a head and seatboard.
A curved window projecting out
of the face of a wall at a 10° angle.
Bow windows are usually comprised of three to six windows
mounted with a head and seatboard.
BRYN MAWR II™ (brin mar)
state-of-the-art replacement windows with the classic look of traditional craftsmanship.
Thermaflect® high-performance Low "E" glazing system is standard.
A round, soft PVC weather strip used where a compression-type seal is required (casement and awning windows).
Polyisobutylene is a hot melt sealant used as the primary seal for
dual seal systems on insulated glass units.
A very small
metal tube, which is factory placed into insulated glass to
accommodate air pressure differences.
Capillary tubes are not sealed after installation.
A window with
one or more horizontally operating swing-out sashes hinged at the jambs.
of various widths used to trim window openings.
PVC (polyvinyl chloride) product from with CertainTeed windows are constructed.
The number of cubic feet of air leakage per minute per each lineal foot.
Beads or drops of water that accumulate on the inside of the window
when warm, moisture-laden
air from the interior cools to the
point where it can no longer hold the water vapor.
Refers to heat flow through a solid material such as a window frame or glass.
In the winter, the interior surface of a window is warmed by the home's
system and that heat is conducted (or transferred) to the cooler outdoors.
Measures the amount of visible light that is transmitted through the glass.
Removing the glass from the window frame.
substances used to absorb
moisture and solvent vapors from the airspace of insulating glass units.
DEVON® (dev in)
CertainTeed's proven line of replacement windows,
installed in more than three quarters of a million American homes.
A window measurement in two places, each corner to the opposite corner.
In traditional window construction, the separate panes of glass
up the gridwork of a whole window.
Also called double-pane
window panes made up of two layers of glass with an insulating space in between.
A window with two movable up-and-down sashes for optimum ventilation.
Double-strength glass (1/8"). Also known as heat
DUAL GLAZED UNITS
Units consisting of two lites of
glass and one airspace.
The act of leaving an enclosed space.
In the window industry the term refers
to the dimensions of the opening of a window or door (the
horizontal clear distance,
vertical clear distance and the area of the opening which are established
United Building Council). The reason for establishing minimum egress dimensions
is to insure that a person attempting to leave the building in an emergency situation
have room to maneuver. Also proper "egress" will allow a fireman to enter
a home while
wearing emergency equipment. In 1985, the minimum egress dimensions
required by most codes are 22"
horizontally, 24" vertically and 5.7 square feet in area.
Some areas of the country use different
A measurement of a surface’s ability to emit
long wave radiation or room temperature
radiant heat. Emissivity varies from 0 (no emitted infrared)
1 (100% emitted infrared) and is the complement of reflection for infrared opaque coatings and
The comparative ability of a material to absorb and
reflect long-wave heat energy;
the lower the value, the better the insulating quality of the material.
The vinyl flange surrounding the perimeter frame of a vinyl window
or patio door.
The non-operable portion of a door. Designated
as the "0" panel in a slider diagram.
that is permanently installed without movable sashes.
lineal of the window; it holds the sash or casement.
of the frame.
The sides of the frame.
The horizontal member along the bottom of the frame of the window.
Strong, weathertight method of heat-joining the corners of sashes and frames.
A specialty window that forms a glass box recessed in a wall;
shelf suitable for cultivating house plants.
that incorporate arcs or non-standard angles t
o make them a shape other than rectangular or square.
A window with one or two sashes that slide sideways within a track
GRIDS (OR GRILLS)
Crosspieces applied to the interior of a window
to replicate the look of muntins. See MUNTIN.
The top portion of
the window frame.
Actual net window dimension. Most heel dimensions
are 1/2" smaller than rough opening dimensions.
A vertical window measurement taken in three places: left side, right
side and middle.
Windows that have U-factors
of .40 or lower.
Air leakage, which can escape through cracks
the glass assembly and the window frame, resulting in heat loss.
GLASS UNIT (IG UNIT)
More than one glass pane forming a sealed system of panes used t
increase the thermal efficiency of a window. See DOUBLE-GLAZING.
Insulating glass unit bonded to the sash to create a single unit and increase weather resistance.
The vertical sides of a window frame.
Two or more lites
of glass bonded together with a plastic inner layer.
A single frame of glass in a window or door.
A non-metallic material or system that separates the panes of glass in a double-pane window,
reducing heat transfer and making the window warmer
at the edges than traditional
metal spacers; also reduces condensation.
LOW-EMISSIVITY (LOW "E")
Low-emissivity glass is coated with a microscopically thin metallic layer t
hat allows visible
light to pass through, while blocking ultraviolet and infrared
solar energy and reflecting away
long-wave room-side heat energy.
Different types of Low “E” coatings offer varying levels
of performance for each of these tasks.
MULLION (mul yen)
joining piece that connects windows in a combination window.
MUNTIN (mun tn)
traditional "grid" wood windows, the bar that holds the separate window panes within a sash. See GRIDS.
A pre-punched fin around the window through which nails can be driven
to hold the window in the rough opening; common to new construction windows.
The slotted hole in the nail fin through which the fastener is placed.
CertainTeed's windows for new construction, designed for the West.
CertainTeed's advanced-design windows for new construction, with a true sloped sill and 7/8"
National Fenestration Rating Council.
A textured glass that provides a translucent or semi-opaque effect for enhanced
A sliding door made of two large panes of glass set
in sashes; one stationary, one operable.
A window that
is permanently fixed in one position to afford the least obstructed view of the outdoors.
window can also be referred to as a FIXED WINDOW.
A vertical measurement
of level, taken front to back and side to side.
extruded member of vinyl frame or sash.
This refers to the process of heat traveling via infrared or heat rays
from a warm object
to a cooler object. Radiant heat loss accounts for a large percentage of the
heat loss in windows.
Radiant heat gains occur when sunlight shines through a window and warms objects
The opening in a wall section into which the window
The resistance of a material to heat flow.
This common measurement is the reciprocal of the U-Value. R-Value can be compared
U-Value by dividing 1 by the R-Value.
(Thus, an R-Value of 2 equals a U-Value of 0.5.) See U-VALUE.
The moveable framework into which glass is set.
slides in the frame of the window in grooves provided in the frame.
device that counterbalances a window sash.
Insulated glass units
are sealed at the edges to prevent moisture and dirt from contaminating the interior of the unit.
seal must be durable and usually consists of an aluminum spacer with an exterior sealant.
A plastic block used to support the insulated unit in the window frame.
A ratio, which indicates the relative solar heat gain through a lite of glass or glazing system.
A lower number means more shading and less solar heat gain.
The bottom portion of the window frame.
A window with one
moveable up-and-down sash, and one fixed sash.
A window with one
or two sashes that slide sideways within a track (glider).
SOLAR HEAT GAIN COEFFICIENT
The amount of direct solar radiation that enters through the glass into the home as heat.
smaller the number, the better the glazing is at preventing solar heat gain.
CertainTeed's value-oriented line of replacement windows, designed for the West.
The material that separates and seals the glass in an insulated glass unit.
The vertical members of a sash.
Fin option with the fin flush with the window face.
This option is used most
often in replacement window applications,
with the fin serving as a frame around the window.
Heat strengthened glass used for safety purposes.
Approximately four times as strong as annealed glass.
CertainTeed's proprietary Low "E" glazing system that incorporates two metallic layers,
opposed to the ordinary single layer of coating on the window glass.
These layers add additional
sensitivity to the glass that selects
the most beneficial wavelengths of light and heat and blocks
Windows made up of two layers of glass with an insulating
space in between.
The rate of heat flow through a glazing system;
the lower the value, the better the insulating quality.
U-Value can be compared to R-Value by dividing
1 by the R-Value.
(Thus, a U-Value of 0.5 equals an R-Value of 2) See R-Value.
Measures the amount of damaging ultraviolet light that is blocked from being transmitted
through the glass.
The sliding or projecting portion of the window.
Also called the sash.
VISIBLE LIGHT TRANSMISSION
Measures the amount of
visible light that is transmitted through the glass.
lengths of material to prevent air infiltration.
Slots or holes
in the frame sill to provide outside release of infiltrated water.
A horizontal measurement taken in three places, the top, middle, and bottom.
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