Side-by-side comparison of Triple glazing vs Double glazing

On this page, you will find a glazing comparison table that compares triple glazing vs double glazing.

We’ve also shared our views on why triple glazing may not always be the best option.

Triple glazing vs Double glazing

The “more or thicker/bigger” doesn’t correlate with the efficiency

Triple glazing is three panes of glass sealed together. It is one of the main features of Triple glazing, and by this feature, triple-glazing is distinguished from Double glazing.

If you look back to when insulated glazing first entered the market.

The key feature was its two panes of glass and the air gap in between – this made it far superior to single glazing.

The triple-glazing design came to the world through the logic that more panes of glass with an additional cavity would be even more efficient – and it truly is.

However, after years of development, one of the key features influencing glazing unit performance became the insulation substances inside the cavity, such as inert gases or vacuum.

triple glazing cavity

A thicker cavity does not mean better insulation. 

The cavity is the gap inside the glazing units formed by two or three glass panes. In this gap between glass panes, you can have air, gas or extract air and create a vacuum.

All three substances will contribute differently to energy performance. 

For example, a vacuum does not transmit heat and offers better insulation at a 0.7mm cavity. Compare this to triple glazing with a 24mm cavity. 

Is triple glazing in any way better than modern double glazing? 

If you want to achieve a lower 0.7 U-value of FINEO glass or window soundproofing over 35 dB, triple glazing can help you with this. The extra layer of glass will contribute to better soundproofing of over 42 dB. 

However, the 0.7 U-Value of vacuum glazing is almost as efficient as a well-insulated wall and sets the windows well above A-rated windows on the energy efficiency scale.

A sound reduction of 42 dB is only needed for windows on high streets, busy roads with excessive traffic and noise, or properties close to airports and train stations.

Triple glazing sound reduction
Triple glazing is not retrofittible

Triple glazing is not suitable for restoration projects

If you have period wooden windows with single glazing, triple glazing is not an option.

Unlike vacuum double glazing or slimline double glazing, triple glazing can not be fitted into period timber sash windows.

Learn more about Reglazing single-glazed windows here.

To compare window glazing options, please select the type of glazing you want to compare.

You can compare up to three glazing options simultaneously on desktop and up to two on mobile devices.

Alternatively, you can compare different glazing options by following the links below:

Old double glazing vs new.

Compare glazing

Triple glazing vs Double glazing

FINEO glass - VIG Single glazing Triple glazing Pilkington spacia Landvac - VIG Slimline double glazing - Krypton Low-e double glazing Argon Old double-glazing
FINEO glass - VIG Single glazing Triple glazing Pilkington spacia Landvac - VIG Slimline double glazing - Krypton Low-e double glazing Argon Old double-glazing
FINEO glass - VIG Single glazing Triple glazing Pilkington spacia Landvac - VIG Slimline double glazing - Krypton Low-e double glazing Argon Old double-glazing

Suitable for retrofitting

Suitable for retrofitting

Suitable for retrofitting

Not Suitable for retrofitting
Suitable for retrofitting
Suitable for retrofitting
Suitable for retrofitting
Not Suitable for retrofitting
Not Suitable for retrofitting
Suitable for retrofitting

Suitable for retrofitting

Not Suitable for retrofitting
Suitable for retrofitting
Suitable for retrofitting
Suitable for retrofitting
Not Suitable for retrofitting
Not Suitable for retrofitting
Suitable for retrofitting

Suitable for retrofitting

Not Suitable for retrofitting
Suitable for retrofitting
Suitable for retrofitting
Suitable for retrofitting
Not Suitable for retrofitting
Not Suitable for retrofitting

Warranty & Lifespan

15

Warranty

25+

Estimated Lifespan

5

Warranty

25+

Estimated Lifespan

10

Warranty

25+

Estimated Lifespan

15

Warranty

25+

Estimated Lifespan

5

Warranty

15+

Estimated Lifespan

5

Warranty

20+

Estimated Lifespan

5

Warranty

15

Warranty

25+

Estimated Lifespan

5

Warranty

25+

Estimated Lifespan

10

Warranty

25+

Estimated Lifespan

15

Warranty

25+

Estimated Lifespan

5

Warranty

15+

Estimated Lifespan

5

Warranty

20+

Estimated Lifespan

5

Warranty

15

Warranty

25+

Estimated Lifespan

5

Warranty

25+

Estimated Lifespan

10

Warranty

25+

Estimated Lifespan

15

Warranty

25+

Estimated Lifespan

5

Warranty

15+

Estimated Lifespan

5

Warranty

20+

Estimated Lifespan

5

Warranty

Energy efficiency

0.7

U-Value W/m2.k

5.8

U-Value W/m2.k

0.69

U-Value W/m2.k

1.1

U-Value W/m2.k

0.48

U-Value W/m2.k

1.9

U-Value W/m2.k

1.2

U-Value W/m2.k

2.6

U-Value W/m2.k

0.7

U-Value W/m2.k

5.8

U-Value W/m2.k

0.69

U-Value W/m2.k

1.1

U-Value W/m2.k

0.48

U-Value W/m2.k

1.9

U-Value W/m2.k

1.2

U-Value W/m2.k

2.6

U-Value W/m2.k

0.7

U-Value W/m2.k

5.8

U-Value W/m2.k

0.69

U-Value W/m2.k

1.1

U-Value W/m2.k

0.48

U-Value W/m2.k

1.9

U-Value W/m2.k

1.2

U-Value W/m2.k

2.6

U-Value W/m2.k

Vacuum port / Plugs

No Vacuum port / Plugs
No Vacuum port / Plugs
No Vacuum port / Plugs

Getters

Yes, along unit edge

Yes, along unit edge

Yes, circle in corner

Yes, along unit edge

Yes, along unit edge

Yes, circle in corner

Yes, along unit edge

Yes, along unit edge

Yes, circle in corner

Microspacers

At 20mm centres

At 20mm centres

At 70mm centres

At 20mm centres

At 20mm centres

At 70mm centres

At 20mm centres

At 20mm centres

At 70mm centres

Thickness

7.7 mm

Thickness

3-5 mm

Thickness

36

Thickness

6.2 mm

Thickness

8.3 mm

Thickness

12 mm

Thickness

24

Thickness

24 mm

Thickness

7.7 mm

Thickness

3-5 mm

Thickness

36

Thickness

6.2 mm

Thickness

8.3 mm

Thickness

12 mm

Thickness

24

Thickness

24 mm

Thickness

7.7 mm

Thickness

3-5 mm

Thickness

36

Thickness

6.2 mm

Thickness

8.3 mm

Thickness

12 mm

Thickness

24

Thickness

24 mm

Thickness

Unit Make Up

4 – 0.7 – 3

4 -12 – 4 -12 – 4

3 – 0.2 – 3

4 – 0.3 – 4

4 – 4 – 4

4 -16 – 4

4 -16 – 4

4 – 0.7 – 3

4 -12 – 4 -12 – 4

3 – 0.2 – 3

4 – 0.3 – 4

4 – 4 – 4

4 -16 – 4

4 -16 – 4

4 – 0.7 – 3

4 -12 – 4 -12 – 4

3 – 0.2 – 3

4 – 0.3 – 4

4 – 4 – 4

4 -16 – 4

4 -16 – 4

Cavity thickness

0.7 mm

24 mm

0.2 mm

0.3 mm

4 mm

16 mm

16 mm

0.7 mm

24 mm

0.2 mm

0.3 mm

4 mm

16 mm

16 mm

0.7 mm

24 mm

0.2 mm

0.3 mm

4 mm

16 mm

16 mm

Insulation

Vacuuum

Argon gas

Vacuuum

Vacuuum

Krypton gas

Argon gas

Air

Vacuuum

Argon gas

Vacuuum

Vacuuum

Krypton gas

Argon gas

Air

Vacuuum

Argon gas

Vacuuum

Vacuuum

Krypton gas

Argon gas

Air

Visible Light Transmittance

79%

64%

78%

78%

79-85%

81%

81%

79%

64%

78%

78%

79-85%

81%

81%

79%

64%

78%

78%

79-85%

81%

81%

Manufacture Location

Belgium πŸ‡§πŸ‡ͺ

UK

UK πŸ‡¬πŸ‡§

Japan πŸ‡―πŸ‡΅

China πŸ‡¨πŸ‡³

UK πŸ‡¬πŸ‡§

UK πŸ‡¬πŸ‡§

UKΒ πŸ‡¬πŸ‡§

Belgium πŸ‡§πŸ‡ͺ

UK

UK πŸ‡¬πŸ‡§

Japan πŸ‡―πŸ‡΅

China πŸ‡¨πŸ‡³

UK πŸ‡¬πŸ‡§

UK πŸ‡¬πŸ‡§

UKΒ πŸ‡¬πŸ‡§

Belgium πŸ‡§πŸ‡ͺ

UK

UK πŸ‡¬πŸ‡§

Japan πŸ‡―πŸ‡΅

China πŸ‡¨πŸ‡³

UK πŸ‡¬πŸ‡§

UK πŸ‡¬πŸ‡§

UKΒ πŸ‡¬πŸ‡§

Lead-timed

6-8 weeks

4-6 weeks

16 weeks

10 weeks

2-4 weeks

2-4 weeks

2-4 weeks

6-8 weeks

4-6 weeks

16 weeks

10 weeks

2-4 weeks

2-4 weeks

2-4 weeks

6-8 weeks

4-6 weeks

16 weeks

10 weeks

2-4 weeks

2-4 weeks

2-4 weeks

Safety

Safety Film & Tempered glass available

Safety Film & Tempered

Safety Film & Tempered glass available

Film required

Tempered

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered

Safety Film & Tempered glass available

Film required

Tempered

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered

Safety Film & Tempered glass available

Film required

Tempered

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Safety Film & Tempered glass available

Seal type / Spacer

Glass solder

Spacer bar with warm edge option

Glass solder

Metal

Super Spacer

Aluminium Spacer

Aluminium Spacer

Glass solder

Spacer bar with warm edge option

Glass solder

Metal

Super Spacer

Aluminium Spacer

Aluminium Spacer

Glass solder

Spacer bar with warm edge option

Glass solder

Metal

Super Spacer

Aluminium Spacer

Aluminium Spacer

Acoustic properties

35 dB

Sound Reduction Index (Rw)

30 dB

Sound Reduction Index (Rw)

42 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

39 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

39 dB

Sound Reduction Index (Rw)

30 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

30 dB

Sound Reduction Index (Rw)

42 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

39 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

39 dB

Sound Reduction Index (Rw)

30 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

30 dB

Sound Reduction Index (Rw)

42 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

39 dB

Sound Reduction Index (Rw)

35 dB

Sound Reduction Index (Rw)

39 dB

Sound Reduction Index (Rw)

30 dB

Sound Reduction Index (Rw)

Special Shapes

Special shapes

Special shapes

Special shapes

No Special shapes

Special shapes

Special shapes

Special shapes

Special shapes

Special shapes

Special shapes

No Special shapes

Special shapes

Special shapes

Special shapes

Special shapes

Special shapes

Special shapes

No Special shapes

Special shapes

Special shapes

Special shapes

Fully Recyclable

Fully Recyclable
Fully Recyclable
Fully Recyclable
Fully Recyclable
Fully Recyclable
Fully Recyclable

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