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Warm Edge:

Term used to describe insulating spacer technologies that achieve better center of glass thermal performance (u-value) than a traditional aluminum spacer.


A measure of heat gain or heat loss through glass due to the thermal conductance and the difference in indoor and outdoor temperatures. As the u-value decreases, so does the amount of heat that is transferred through the glazing material. The lower the u-value the more restrictive the fenestration product is to heat transfer; reciprocal of r-value.


The panel(s) of a wall located between vision areas of windows which conceal structural columns floors and shear walls.


A desiccant filled frame used to separate two lites of glass in an insulating unit.

Solar Reflective Coatings:

Coatings that reduce heat gain through higher solar reflection.

Solar Heat Gain Coefficient (SHGC):

The portion of directly transmitted and absorbed solar energy that enters into the building's interior. The higher the SHGC the higher the heat gain.

Solar Control Glass:

Tinted and/or coated glass that reduces the amount of solar heat gain transmitted through a glazing product. 


A process of applying a specific design or pattern to glass. The design is made by placing a screen over a piece of glass and then pressing ceramic frit by means of a large squeegee through the pores of the screen. After the frit is applied the glass goes through an infra-red oven to dry the frit and then through a tempering furnace to fire (bond) the frit to the glass permanently.

Relative Heat Gain (RHG):

The amount of heat gained through glass taking into consideration the effects U-value and shading coefficient. The English System relative heat gain is calculated as: RHG = (Summer U-value x 14°F) + (Shading Coefficient x 200). The Metric System is calculated as: RHG = (Summer U-value x 7.8°C) + (Shading Coefficient x 630). The lower the RHG the more the glass product restricts heat gain.


Thermal resistance of a glazing system expressed ft2/hr/°F/BTU (m2/W/°C). The r-value is the reciprocal of the U-value. The higher the R-value, the less heat is transmitted through the glazing material.

Polyvinyl Butyral (PVB):

The plastic or vinyl used in the makeup of a laminated unit the vinyl is what holds that unit together.

Polyisobutylene (PIB):

The primary seal of an insulating unit and the key component in restricting moisture vapor transmission.

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177 Drumlin Circle, Concord, ON L4K 3E7  |  905-482-2144

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