A U-value, also known as thermal transmittance, is the rate of transfer of heat through all the thicknesses of a building component. Essentially, a U-value measures how well a building material is able to insulate and keep heat in or out. Materials with lower U-values are better insulators, meaning they do a better job at keeping heat in during winter and keeping it out during summer.

How much do double glazed windows cost?

Every project is unique. This means we assess your project individually to meet the specific requirements and customise windows and doors to suit your design. Our windows and doors are bespoke, high-performance products beyond double glazing. The choice of hardware, style, size and glass type will impact the overall price. We will provide a detailed quotation based on the details supplied, including alternate options and cost variations. Please send your plans or window schedule (sizes and requirements) to info@miglas.com.au to receive your free, no-obligation quotation.

Do I need double glazing?

Double glazing offers convenient comfort and security levels all year round. In addition to the glazing, minimal air leakage is important for thermal efficient windows and doors. Double glazing is necessary for modern homes to block unwanted heat gain in summer and heat loss in winter. Low conductive frame material (ie. timber), compressible gaskets and supporting hardware are additions you should consider.

Is double glazing enough?

Double glazing is only one component that contributes to performance. The frame, gaskets and hardware, as well as the level of craftsmanship, all influence the quality of the product.

Argon gas is an inert, non-toxic gas used in insulating glass units (double glazing) to reduce heat transfer. Other companies offer these gas fillings to make up for their less efficient framing materials. Miglas offers this option to maximise heat control.

Double Glazing

Double glazing is standard across the Miglas AliClad range, which offers superior thermal performance than single-glazed products.

Depending on what you want to achieve, different glass options are available for every double-glazed window frame.

Stop Heat Gain/Loss
Noise Control
Bushfire Safety
Self Cleaning Coatings
Low U-Value
Security & Safety
Shading/Solar Control
Prioritising Winter Solar Heat

We provide high-performance timber frame double-glazed windows with an aluminium coating, giving you improved thermal efficiency in a durable, lasting solution.

Sealed Air Space

(Optional Argon/Krypton gas)

Timber Frame

Glass Sheets

Aluminium Cladding

Spacer and Seal

How does double glazing work?

A double glazing frame, 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 thick to ensure there is no movement in the air causing thermal convection.

The increased thermal insulation of double glazed windows provides many benefits to the home, including minimising ambient heat gain in summer and reducing heat loss in winter. This provides a more consistent temperature and reduces 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, greatly increasing the condensation resistance of the glass.

In the Miglas AliClad Fixed Window, our entry-level clear double glazing provides an SHGC of 0.68 and a U-Value of 2.74 — still capable of 7-star energy ratings. With a simple upgrade to Low-E glass, that can improve to an SHGC of 0.55 and a U-Value of 1.7

Double Glazed Products

Windows

A complete range of modular window designs to fulfil any design requirement, from maximising ventilation to large uninterrupted picture windows to soak up the view. Enjoy excellent performance and efficiency from a leading composite window manufacturer.

Doors

High-performance doors that play a vital role in providing access, ventilation, and integration of your indoor and outdoor spaces. Miglas doors offer exceptional security with a state-of-the-art German multi-point locking system that is near impenetrable.

SOFT COAT LOW E OPTIONS

Soft coat Low E glass is manufactured by applying multiple thin layers of silver and metal oxides to the glass surface by a sputtering deposition process. Sputtered coatings create a finished glass product that is far superior and dynamic in performance, exhibiting very high levels of clarity and without the haze levels associated with the older style Low E coatings.

High performing soft coatings provide an improved balance between Solar Heat Gain Coefficient (SHGC) and U Value when compared to clear and traditional hard coated products, whilst also retaining far superior levels of Visible Light Transmission (VLT).

Due to the ‘soft’ nature of sputter Low E coatings, the product requires special handling and glass processing techniques and can only be glazed as part of an IGU. The coating faces the airspace on either surface 2 or 3, this protects the coating from environmental conditions and also maximises the overall performance of the IGU. Lightbridge™, Performatech™ and Climatech™ by Viridian Glass are examples of high performing IGU’s manufactured with a sputter Low E coated glass.

Viridian Lightbridge™ (High Solar Heat Gain) [Centre of Glass U-value 1.4 / SHGC 0.59]

Viridian Lightbridge™ is an ideal IGU solution for cooler climates and southern elevations for both residential new build and renovation projects.

Playing a key role in managing both the heat flowing in and the heat flowing out of the glazed elements of the building, Viridian Lightbridge™ helps to make your home cooler in summer and warmer in winter whilst allowing the room to bathe in very high levels of natural light.

By combining the range of solutions offered by the Viridian Lightbridge™ suite of products with the added benefits of the Viridian Lightbridge™ warm edge IGU spacer, Viridian Lightbridge™ Plus helps to both optimise a windows overall level of energy efficiency performance and provide some of the most thermally efficient residential window and door systems currently available in Australia.

In the Miglas AliClad window, Viridian Lightbridge™ double glazed units provide a U Value of 1.7 and a SHGC of 0.55.

Viridian Performatech PH® (Low Solar Heat Gain) [Centre of Glass U-value 1.3 / SHGC 0.25 - 0.33]

The advanced Low-E coating of Performatech PH® glass range transmits more than 68% of the sun’s available light into a home while blocking 67 - 75% of the sun’s damaging UV energy and other contributors to fading—in all, 37% better than standard clear insulating glass. This helps to protect interior furnishings, fabrics and carpets from fading. More importantly, Performatech PH® glass helps homeowners shield their homes, and their utility bills, from the summer heat and winter cold. Measured against windows assembled with ordinary clear glass, Performatech PH® glass lessens solar heat gain by more than two thirds. When the seasons turn cold, the high insulating value of Performatech PH® helps reduce furnace heat loss through windows by up to 50%.
Those qualities have made Performatech PH® glass the name to know in the window industry for year-round comfort and energy performance.

In the Miglas Aliclad Fixed Window, Performatech PH glazing provides a U-Value of 1.8 and a SHGC of 0.28 - 0.36

ACOUSTIC OPTIONS

Alongside significantly improved thermal performance, Double glazed windows provide substantial acoustic benefits to minimise sound intrusion into your home. While windows are not the only design element to consider in overall acoustic performance, they are likely to be the 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. Options such as Viridian Comfort Hush Glass can provide up to 38Rw in noise reduction, when combined with a Miglas Double Glazed Aliclad Frame.

READ MORE ABOUT NOISE REDUCTION

BUSHFIRE GLAZING OPTIONS

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 throughout the project in addition to what is normally only required for human Impact. Our Miglas AliClad suite is also tested to 6m2 of glass in BAL-40, with no requirement for any external screens.

SECURITY OPTIONS

Would you like 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.

LEADLIGHTING

Leadlights can be produced as an overlay (facsimile) or 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.