Glazing

The Glass and Glazing Federation (GGF) is the recognised leading authority for employers and companies within the flat glass, glazing, home improvement, plastics and window film industries.

All GGF Members follow a strict code of conduct that is laid down in the Federation’s Code of Good Practice. By dealing with a GGF Member you reduce the risk of problems with any work carried out.

The GGF logo is a sign of quality and reliability. GGF members can be found in over 1,500 business locations throughout the UK.

The Glass and Glazing Federation has recently completed a twelve month project looking at the environmental credentials of the Industry and the benefits of installing Energy Efficient Windows (EEW).  The results of the project have clearly proven that Energy Efficient Windows will:

  • Save customers money on their final bills
  • Decrease the tonnage of carbon emitted from the average dwelling
  • Decrease the tonnage of carbon dioxide emitted from the average dwelling

On a larger scale Energy Efficient Windows will:

  • Reduce the UK’s carbon footprint
  • Reduce the national domestic energy expenditure
  • Enable the Window Industry to reach current and impending Government energy targets.

In 2002 the Government introduced a revision to Approved Document L to the Building Regulations for both new build and the replacement window market. This revision introduced a specific energy performance for the window. Prior to that date the thermal performance of the window was unregulated.

Current CO2 emissions from an average dwelling is 1.6 tonnes. By installing Energy Efficient Windows to a typical single glazed dwelling, you would reduce the carbon footprint by 0.30 tonnes, which is a 19% reduction. If the property had pre-2002 double glazing, the reduction in carbon footprint would be 0.09 tonnes, which is a 6% reduction.

By installing Energy Efficient Windows in a typical UK house, you could make average yearly energy bill savings of £150.49 for a single glazed house. This figure would rise to £461 if the single glazed house was electrically heated. You could expect a saving of £44.88 on a pre 2002 double glazed house.

By taking the above two sets of facts and correlating them with all of the existing housing stock produces some dramatic findings. If all single glazed homes were converted to Energy Efficient Windows the average yearly savings would be:

  • £1,568 Million
  • 2,516,986 tonnes of carbon
  • 9,228,950 tonnes of CO2

Similarly if all pre-2002 double glazed windows were converted to Energy Efficient Windows, the average yearly savings would be:

  • £794 Million
  • 1,453,677 tonnes of carbon
  • 5,330,148 tonnes of CO2

By adding these together and replacing all pre-2002 windows with Energy Efficient Windows will produce average yearly savings of:

  • £2,363 Million
  • 3,970,663 tonnes of carbon
  • 14,559,098 tonnes of CO2

This would result in a 10% reduction in domestic emissions from dwellings nationally and a 10% reduction in energy expenditure.

Energy Efficiency Measurement

Window energy efficiency has typically been measured in U-value.

Increasingly the Window Energy Rating (WER) of the window is being used. The WER takes into account solar gain and air tightness as well as the direct heat loss covered by a U-Value. A simple example of the different impact is that an insulated brick and block wall would have a low-U-value of around 0.2, but has virtually zero solar gain and hence energy is required on lighting and no heat benefit from solar gain is delivered. This compares with say a WER band A window with a U-value of approximately 1.2 to 1.4 but which because of solar gain delivers no heat loss over an annual cycle.

A WER is an objective measurement and means of comparing performance verified by an independent certification process operated by the British Fenestration Rating Council Limited (BFRC) under the direction of the Glass and Glazing Federation. Ratings range from A to G and certified suppliers can display an energy rating label of their product in the familiar form authorised for use in the “white goods” industry.

Replacing the windows in your home to new Energy Efficient Windows has a major part to play in reducing your energy bills and household emissions.

Follow the link to the GGF website to access the GGF’s Window Energy Calculator to ascertain the likely savings on your home. You can also access GGF Members in your area who can undertake the work.

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