High-Performance Insulating Glass


Vitrage isolant haute performance

Thermalite Insulating Glass Unit:

  • Double or triple high-performance insulating glass unit with low emissivity glass, argon gas, warm-edge spacer and double seal for a longer service life
  • Prelco offers a wide range of glazings that meet specific requirements such as, countering solar heat gain, preventing heat loss in winter, resisting wind and snow loads, improving the quality of the glass (natural lighting), while enhancing the appearance of a building
  • Available in sizes up to 106" x 204" (2692 x 5182 mm)*
  • Try our ThermaSpec online tool to compare the optical and thermal performances of our complete line of insulating glass units

* Certain conditions apply, contact-us for additional details.


  • Insulating glass consists of assembling two or more individual lites separated by a hermetically sealed air space. Lites are assembled with a rigid spacer in between them which contains desiccant granules that absorb excess humidity trapped inside the air space. The perimeter of the insulated glass unit is sealed using a primary sealant (polyisobutylene) and a secondary seal (polysulfide or silicone).
  • Insulated glass units destined to be used in commercial buildings are generally 25 mm thick and are constructed with two lites of 6 mm glass and an air space of 13 mm.  The addition of a lite of a high performance low emissivity glass would reduce solar heat gain entering the building, minimize heat loss to the exterior, while providing a source of natural light.

Component options

  • Glass :
    -Substrates : clear, low iron, tinted (grey, bronze, green, blue, etc.)
    -Low-E : LoE² 272, LoE³ 366, LoE² 240, etc.
    -Reflective : Eclipse Advantage™, Solarcool®, etc.
    -Laminated : clear, tinted, translucent, decorative : Vanceva®, etc.
    -Printed : Silkscreened Prel-Design, In-Glass Printed Prel-Design
    -Low maintenance : Neat®
  • Spacers : R-Max™, LPS Stainless Steel, LPX aluminum
  • Filling Gas : argon or air
  • Seal : grey or black silicone, grey or black polyisobutylene

Standards and Certifications

  • CAN/CGSB 12.8 – Insulating Glass
    ASTM E 2190 – Insulating glass unit performance and evaluation
    GANA GLazing Manual – Glass Association of North America
    IGMA – Insulating Glass Manufacturers Alliance


  • Vertical glazing : punch windows, curtain walls, spider systems
  • Sloped glazing : skylights, canopies, roof windows

Production Capacity

  mm po
Minimum Dimensions 150 x 300 6 x 12 
Maximum Dimensions* 2692 x 5182 106 x 204

Manufacturing Tolerances

Width and Length
if total length
< or = 3000
if total length
< or = 118
if total length
> 3000
if total length
> 118
Thickness ±1.6  ±1/16 
Maximum Weight 682 kg 1500 lb

Maximum insulated glass unit dimensions are determined by a number of considerations, such as their thickness, weight, ratio of width/height, application and loads (ex. wind and snow). Maximum, achievable, dimensions do not imply that sealed units manufactured to these dimensions will meet all laws, rules, regulations and other requirements. It is up to the user to ensure that the products they order are suitable for their intended use.


Clic on thumbnail to enlarge image.


Gare Fluviale de LévisGLCRM architectes / LoE 366 / Levis, QC / Stéphane Groleau

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Jewish General Hospital - Block KJodoin Lamarre Pratte Architectes / Spandrel Glass / Montreal. QC / Stéphane Groleau

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Desjardins LévisABCP architecture / LoE 366 / Lévis, Qc / Photo: Stéphane Groleau

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Complexe de la SantéEspace vital Architecture / High-Performance Insulating Glass and LoE 272 / Sherbrooke, Qc

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CHUMNFOE et associés, Jodoin Lamarre Pratte et Associés, MSDL Architectes, Lemay & Associés Architectes, Parkin Architects Ltd / LoE 272 and Ceramic Coating Prel-Coat / Montréal, Qc / Photo: Stéphane Groleau

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Maison du développement durableMenkès Shooner Dagenais Le Tourneux Architectes / Triple Thermalite / Montréal, Qc


Maison du développement durableMenkès Shooner Dagenais Le Tourneux Architectes / Triple Thermalite / Montréal, Qc

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Green Buildings
Thermaspec : Performance Calculating Tool
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