8 / April

FAQ: What are the benefits of triple glazing?

What is triple glazing?

Put simply, triple glazing is three panes of glass instead of just one (single glazing) or two (double glazing).

What are the benefits of triple glazing?

The energy efficiency of a window is measured as a u-value. The lower the u-value the more efficient your window is. A single glazed window will have a u-value of around 5 watts per square meter (W/m²k). Older double glazing (14 years plus) will be around 3 W/m²k and newer double glazing (5-10 years) around 1.6 W/m²k, in line with Building Regulations. Newer A-Rated options (less than 5 years old) offer improved values of 1.4w/m²k but triple glazing can reduce the u-value to as low as 0.7-0.8 W/m²k for ultra-high performance or to achieve Passive House (Passivhaus).

Windows are considered to be one of the weak spots in a house when it comes to losing heat. Whilst still a very efficient option in the typical home, double glazing (and anything less) can create cold patches in your property. If you insulate your walls, roof and floor but don’t give the same attention to your glazing, condensation can occur. Triple glazing is an excellent solution to this problem because the difference in u-value between the windows and the rest of the property is much less.

Should you choose Triple Glazing?

The opinion is very much divided on this. If you already have well-installed, modern double glazing, then the benefits of upgrading to triple glazing may not be the most efficient solution. However, if you have older double glazing, single glazing, or you’re building a new house, triple glazing is a great option.

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