What is Vacuum Double Glazing?

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What is Vacuum Double Glazing?

An introduction to vacuum double glazing

Vacuum double glazing, an advanced version of traditional double glazing, has emerged as a revolutionary method to enhance energy conservation in buildings.

Unlike conventional double glazing, which contains an air layer or inner gases between the two glass panes, vacuum double glazing has a vacuum between glass panes, thereby forming an insulating barrier of superior efficiency.

Here is a comparison table of the thermal conductivity of different insulation materials and substances.

The vacuum outperforms all of them, making vacuum glazing so efficient.

MaterialThermal Conductivity (W/(m·K))
VacuumNearly 0 (by definition)

Vacuum double-glazing design

Vacuum double glazing involves the use of two closely spaced glass sheets with the intervening space being evacuated of air to create a vacuum.

This vacuum is sustained by a series of small, cylindrical support pillars that are evenly distributed between the glass panes.

These pillars ensure that the glass sheets remain accurately spaced while resisting atmospheric pressure.


In contrast to regular double glazing, where a 6-16 mm gap is maintained between the glass panes with the help of edge spacers, vacuum glazing keeps the panes spaced only 0.2 – 0.5 mm apart.

This minuscule gap, devoid of any conduction or convection, results in extraordinary insulation.

Visual aspect

Apart from the cost, which is considerably higher per square meter for vacuum double glazing, the micro-supportive pillars that keep the glass panes apart might be visible upon close inspection.


While this detail may be unappealing to some people, the majority do not notice them.

The plugs on the corners of vacuum double glazing might not look appealing.

However, there are some brands that don’t use plugs, and even if the plugs are present, they can be concealed during reglazing into the frame.

Invisible retrofitting of LandVac into existing sashes

The former is exactly what our team does with LandVac vacuum double glazing, which has a visible plug on the surface of the glazing units. 

The Advantages of Vacuum Glazing

Vacuum glazing can achieve a U-value as low as 0.48 W/(m²K), which outperforms standard triple glazing. 

This eliminates the issues of fogging and frost accumulation, ensuring clear visibility. The absence of moisture also prevents the degradation of the glazing spacers over time.

FINEO glass U-Value vs Landvac glass U-Value
LandVac u-value performance vs other types of glazing
FINEO glass comparison table

Moreover, vacuum units offer superior acoustical insulation, effectively blocking external noises such as traffic. This makes vacuum glazing an attractive option for residential settings.

Service life expectensy 

VIG (Vacuum Insulated Glazing) is more durable compared to traditional glazing options. Unlike slimline double glazing insulated with gas, it will not lose its insulation properties for at least 10-15 years, a claim backed by manufacturers’ guarantees.

Additionally, it will likely perform well for another 20-25 years. So, the higher initial cost justifies itself if you conduct a basic cost vs benefit analysis. 

You don’t need to replace your entire windows

Yes, you’ve heard it right.

As long as you have wooden windows, there’s no need to worry about rot or any other issues they might have.

Our team can reglaze your existing sash or casement windows, restore frames, and install draught-proofing.

Best of all, all of this is done on-site, ensuring that your property won’t be without windows even for a single night.

Additionally, you won’t need to do any kind of interior renovation, which is usually necessary after new windows are fitted in. 

Choice of VIG Glazing

We work with all major vacuum glazing manufacturers, including popular brands such as FINEO Glass and LandVac.

If you’re wondering which one is better, be sure to check out our FINEO Glass vs LandVac comparison page.

It clearly outlines the pros and cons of each brand, helping you understand which one better fits your preferences and project requirements.

Our recent reglazing projects 


Vacuum Glazing in Commercial and Residential Settings

Although vacuum glazing is a relatively new technology, it holds promising potential for both residential and commercial buildings.

In residential buildings, vacuum-sealed units can provide exceptional insulation for both new constructions and window replacements.

In the case of commercial buildings, vacuum glazing allows for achieving high thermal performance with the thinner profile of a double glaze, as opposed to the bulkier triple glazing.

This results in more interior space and increased transparency.

The Future of Glass Technology: Vacuum Double Glazing

VIG glazing is paving the way for the future of glass technology.

By elevating the concept of double glazing to its ultimate potential, vacuum-sealed units offer unparalleled insulation along with crystal-clear views.

Sure, here’s your proofread sentence:

VIG is similar to EV cars; it’s gaining popularity, and its potential and benefits will positively impact both your pocket and the environment. However, substantial initial investments are required.