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How Does Double Glazing Work? 2018-09-17T02:56:29+00:00

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Welcome to the Windows FAQ & Resources Section

Let us help you with all of your window questions and find the perfect addition to your home.

How does double glazing work?

Double glazing consists of two panes of glass which have a gap in between which is filled with a layer of argon gas. This system keeps your home more energy efficient and helps to reduce sound. The second pane of glass is the sound reducer and the argon gas keeps warm air from escaping, due to its poor heat conductivity.

All the information that you need to know about double glazing and triple glazing, how it works and how they are energy rated. Learn how you can save money and reduce noise in your home by improving your windows.

If we have not answered all your questions, contact a member of our team today.

How energy efficient is All Seasons Roof’s triple glazing?

All Seasons Roof uPVC triple glazed casement windows have a U-value of 0.9, whilst All Seasons Roof uPVC triple tilt & turn windows have a U-Value of 1.0.

How does triple glazing save energy?

Triple glazing traps more heat in the room. The Low E glass reflects heat back into your home, so that your home does not get as cold. It therefore takes less time and energy to heat and you save on your energy bill.

What is double glazing?

A window that is double glazed has two panes of glass with a space in between. The space is filled argon which is a poor conductor of heat. It therefore keeps the warm air trapped in the house and reduces your energy needs. Double-glazing is a window consisting of two panes of glass separated by a layer of trapped argon gas.

This extra pane of glass not only makes your home more secure. It also serves as a noise barrier and helps to keep the noise outside.

What is triple glazing?

A triple glazed window, as the name suggests has 3 panes of so it ffers superior energy efficiency. The All Seasons Roof triple glazed windows are framed with uPVC and can be ordered in a wide selection of colours.

The frame contains insulation in the main chamber which creates smaller chambers reducing heat loss. Each pane of glass is separated by thermally optimised insulating material, so the heat can’t get past the edge of the glass.

Krypton gas fills the gaps between the glass ensuring the best in energy efficiency. These windows are the best performers in our range of windows and they have an energy index of +32, indicating that the window will save 32 kilowatts of energy per square meter annually.

Find out more about triple glazing.

What is secondary glazing?

When you are unable to install double glazing or triple glazing Secondary glazing is an excellent alternative. We another pane just inside your existing window.

Secondary glazing is an ingenious and hard to notice way to improve the energy efficiency of your home without affecting the outer appearance. It offers many features of double glazing including improved sound proofing.

Find out more about secondary glazing.

Does double and triple glazing help to keep noise out?

Neither double nor triple glazing can completely soundproof your windows, either will reduce the sound coming in from outside by a significant amount. How effective they are in the noise reduction will depend on a number of elements including venting.

All Season Roof can offer you the Safe and Sound double glazed casement windows if outside noise is a problem for you. These windows will reduce sound by 36dB.

Will I save on energy expenses if I install double or triple glazed windows?

You will definitely save energy and by implication money if you are replacing old windows. Your expert consultant can help you to choose the windows that can save you the most money. Each of our windows comes with a range of energy ratings and we work out for you exactly how much you will save with each of them using the Glass and Glazing Federation’s energy calculator.

How do Window Energy Ratings work?

One of the vital things to look for when investing in new windows is the Windows Energy Rating (WER). They work the same as energy ratings on electrical goods.

The ratings range from A++ (the most efficient like triple glazed windows) to G (very inefficient). Anything less than C rated will fall foul of building regulations.

The Windows Energy Rating takes account of a number of factors:

  • Thermal Transmittance (U value)
  • Solar factor (G value)
  • Air Leakage (L value)

U-value – the amount of heat that gets through the glass or thermal transmittance. This is measured in Kilowatt-hours, per square meter, per annum.

For example: 3kWh/m2.5.K

This indicates that 3 kilowatts escapes from every square metre of the window annually.

G-value – the amount of solar energy gleaned through the window (solar factor), measured in kilowatt hours per metre, per annum.

L-value – Air leakage through the window, also measured in kilowatt hours per metre, per year. The lower this factor the better.

Why does my double glazing suffer from condensation?

There should be little misting on a double glazed window as the inside pane is warmer than the outside one. If there is misting between the panes it is probably an indication of a problem with the insulation.

Any hole in the seal allow cool in and will result in condensation on the inside of the panes. On the other hand, moisture on the outside of the glass is a good sign as it shows that the warmth is staying inside the house as it is not warming up the outside pane.

Condensation on the inside pane is typically due to poor ventilation and can be relieved by opening the window.

Why is there a drought coming from my double glazing?

You should never feel a drought around your double glazed windows as they are sealed. Feeling a drought could mean that the seal around the brickwork is faulty or the explanation could be simpler like a vent that has been left open. Either way investigate the drought to ensure that the windows are still doing what they were intended to do.

Check the opening windows to ensure that they are tightly closed and that the locks are working. Droughts can only come through if there is a gap.

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