Glossary

Low-E Glass

Stands for low-emissivity, Low-E glass a clear glass with a thin, transparent metal-oxide coating which helps block the transfer of radiant heat.

Emissive

Is a measure of how much glass surface transfers radiant heat. The less radiant heat is transferred the better.

Low-E2

Is a double layer of Low-e on the glass. Sometimes referred to as softcoat Low-E.

Argon Gas

Inert, clear gas that reduces sound transmissions and offers insulating properties much higher than air.

Krypton

Inert colourless gas used instead of air in sealed spaces between panes of glass in insulting glass units to increase insulation.

Insert Window Installation

A window is installed into the existing window frame. The window is installed without disturbing the interior trim or the exterior of your home.

Full Frame Installation

Full frame replacement windows are appropriate when the entire window needs replacement—for example, when it's substantially out of square or has deteriorated beyond repair. The window, including sash, frame and casing is replaced.

Glazing

The installation of glass into a window or door sash. Also refers to the type of glass used in the process

Insulating Glass Unit

IGU - A combination of two or more panes of glass with a sealed air space(s) between panes. Also referred to as thermopanes or sealed units

Double/Dual Glazed

Windows have two layers of glass separated with a spacer. It is the minimum standard allowed by the National Building Code of Canada.

Triple Glazed

Windows that have three layers of glass, and two layers of Low-E film suspended between them. The additional layer and air space give triple glazing better insulation value than that provided by dual glazing. Triple Glazed windows can help reduce sound transmission.

ER Rating

Energy Rating number developed by CSA (Canadian Standards Association) to compare the thermal performance of windows. Measured in watts per square meter.

R-Value

A measure of a products energy efficiency or how a material resists heat transfer or flow. R-value is used to describe the simulative properties of construction materials - the higher the R-value, the better the insulating effect. (R=1/U)

Daylight Transmittance

The percentage of visible light that glazing transmits through a window - a standard clear dual pane has a daylight transmittance of 82%

Condensation

The change of a gas to a liquid state. Warm air can holds more water vapor than cold air, as warm air cools its ability to hold water vapor is reduced allowing excess moisture to condense on the warm side of the glass.

Window Frame

The horizontal and vertical portions that surround the sash and on which it is hung comprise the frames. Frame and sash design and construction are important for both energy efficiency and appearance. Several materials are used:

Aluminum Clad Frame: have the advantage of woods natural insulating qualities but they require less maintenance. Aluminum cladding is available in variety of colours.

Vinyl Frames: are very durable and low maintenance, they can resist colour fading, moisture, corrosion and air pollutants. The material can be easily shaped into the required dimensions. Vinyl windows provide good insulating properties.

Sash

Windows come either fixed or operable. Operable windows have a sash, which is a unit assembly of stiles and rails for holding the glass that moves when the window opens.

Grilles

Decorative inserts for window or door glazing that add a traditional touch. Grilles are found in between the glass sealed in the insulating sealed unit.

Jamb

The interior sides of the window frame

Spacers

These appear around the perimeter of the sealed unit to provide uniform separation between the panes of glass. A high performance or warm edge spacer can increase the energy efficiency of a window. Spacers incorporate a desiccant that absorbs moisture from the trapped air in the space between the glass preventing fogging and condensation.

Casing

The moldings that surround the window and cover the frame.