Double Glazing

Double glazing is standard across the Miglas Aliclad range, which offers superior thermal performance in comparison to that of single glazed products.


Depending on what you want to achieve different glass mix solutions are possible for your double glazed windows.

  • Stop Heat Gain / Loss

  • Noise Control

  • Bushfire Safety

  • Self Cleaning Coatings

  • Low U-Value

  • Security & Safety

  • Shading/Solar Control

Sealed Air Space

(Optional Argon/Krypton gas)

Aluminium Cladding

Timber Frame

Glass Sheets

Spacer and Seal

How does double glazing work?
Double glazing, or an Insulated Glazing Unit (IGU), is two sheets of glass separated by a pocket of air, or inert gas (argon/krypton), to provide an insulative thermal barrier. The pocket is designed to be around 14mm optimal to ensure there is no movement in the air causing thermal convection.

If you imagine putting hot coffee in a thermos flask versus a plastic container which product will retain its temperature for longer? This concept is the same for Double glazing versus Single Glazing.

The increased thermal insulation of the double glazed unit provides many benefits to the home, including minimising ambient heat gain in summer, and minimising heat loss in winter providing a more consistent temperature and reducing the requirements for heating/cooling the home.


The interior surface temperature of the glass is also closer to that of the inside of the home in an IGU and this greatly increases the Condensation resistance of the glass. 

In the Miglas Aliclad Fixed Window, clear double glazing provices a U-Value of 2.74 and a SHGC of 0.68


LowE (EnergyTech) [Centre of Glass U-value 1.6 / SHGC 0.68]

Hardcoat LowE products, like EnergyTech, feature a pyrolytic Low Emissivity metallic coating that is fused at extremely high temperature when the glass is being made, producing a durable hard transparent coating on one surface of the glass. Unlike ordinary float glass, the Low E coating provides better insulation (U-Value) by reducing the emissivity of the glass. This means it helps keep the house warmer winter and cooler in summer. Hardcoat LowE products are a great option to provide improved thermal performance, without drastically effecting Solar Heat Gain for passive design applications allowing it to be suitable for all climate conditions.

In the Miglas Aliclad Fixed Window, Hardcoat LowE double glazing provices a U-Value of 2.0 and a SHGC of 0.64


Consideration; Hardcoat LowE products can exhibit 'hazy' appearance in Direct Sunlight

Softcoat LowE (SolarBan 60) [Centre of Glass U-value 1.38 / SHGC 0.39]

The advanced low-e coating of Solarban® 60 glass transmits more than 70% of the sun’s available light into a home while blocking 79% of the sun’s damaging UV energy and other contributors to fading—in all, 24% better than standard clear insulating glass. This helps to protect interior furnishings, fabrics and carpets from fading. More importantly, Solarban® 60 glass helps homeowners shield their homes, and their utility bills, from summer heat and winter cold. Measured against windows assembled with ordinary clear glass, Solarban® 60 glass lessens solar heat gain by more than half. When the seasons turn cold, the high insulating value of Solarban® 60 helps reduce furnace heat loss through windows by up to 50%.
Those qualities have made Solarban® 60 glass the name to know in the window industry for year-round comfort and energy performance.

In the Miglas Aliclad Fixed Window, Softcoat LowE double glazing provices a U-Value of 1.8 and a SHGC of 0.43


Alongside significantly improved thermal performance, Double glazed windows provide substantial acoustic benefits to minimise sound intrusion into your home. Whilst windows are not the only design element to consider in overall acoustic performance, they are likely to single biggest area of improvement, with an enormous difference between a poorly designed basic window and a high end product like the Miglas composite suite. 



The Miglas AliClad suite is fully tested and certified compliant to BAL-40. Glazing to suit this application is required, where toughened glass is utilised thoroughout the project in addition to what is normally only required for human Impact.



Want that extra level of protection for the weak spots of your building without detracting from the design visually? Then, special laminated security products, such as IntruderGuard™ are the ideal solution.

IntruderGuard™ looks like normal glass but provides a barrier to forced entry that is 20 times harder to break through than standard float glass. So you can stay safe while still having the look that you love.

IntruderGuard™ also reduces the rate at which your furniture fades by absorbing 99% of UV radiation.


Leadlights can be produced as overlay (facsimile) or a traditional leadlight encapsulated within a double glazed unit. Miglas work with a specialist company to provide a double glass unit to the required specifications to be glazed into our frame. The design and shape options are limitless and provide a heritage look, or a classic twist on a modern design.

© 2018 Miglas High Performance Windows

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