Windows

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Windows

Windows allow sunlight into your home, beautify your home and provide you with the ability to enjoy your surroundings.

Finding the right window and door designs for a home is a crucial part of the overall design scheme of new construction or a renovation. There are many window designs and colours to choose from and the best one for you will depend on your needs and taste.

Emerald Windows Ltd offers a range of windows and doors in various shapes, colours and designs to meet your exact requirements. We can create truly bespoke window designs using high-quality materials, ensuring your new windows are to your specifications and are built to last. To discuss designing and installing your new windows, simply get in touch.

What is The Best Glazing Solution for Me?

Let's take some of the jargon out of single, double and triple glazing performance. There are three main criteria that affect the above:

• The number of panes of glass
• The distance of air / argon gas filled gap between them
• The number and type of low E coatings on this glass

A low E coating means 'low emissivity' which is basically a coating applied to the glass that reflects radiant heat back into the room. There are different types and manufactures but we shall refer to it as soft coat from here.

The distance or cavity between panes is important as heat loss will decrease as the cavity increases, peaking at 16 - 20mm.

After this it slightly decreases as air starts to circulate within the cavity. By filling this cavity with argon gas it also reduces heat loss.

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Measuring Heat Loss Through Your Windows

When we talk of heat loss, it is normally quoted as U value. Please remember the U value quoted for glass can be quite different than the overall U value for a window, but the lower the U value the lower the heat loss. We will look at some basic calculations later.


U value is a measure of energy lost per square meter of glass, per degree difference in temperature from inside and out. K=kelvin or Celsius for simplicity.

This is expressed as: U=w/m2/k Here are some values for different glazing. (SC = soft coat)

• 4mm clear glass single glazed - U=5.8
• 4mm clear/16 air/4mm clear double glazed - U=2.8
• 4mm clear/16 cavity argon filled/4mm SC Double glazed - U=1.16
• 4mm clear/16mm Argon/4mm SC/16mm Argon/4mmSC Triple glazed - U=0.6

As can be seen from the above, there is a huge difference between single glazing and triple glazing with high performance glass - 90% reduction in heat loss.

A point to note from above is that these values are based on 16mm cavities. If the cavity should be reduced in triple glazing down to say 2 x 6mm then the performance in U value terms is worse than double glazing even if two panes of soft coat are used.

  • u-value charts

To Discuss your Glazing Needs in Depth

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