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Doors Installation Wiltshire

Energy Rated Windows

With effect from the 1st of October 2010, the building regulations changed and Document L now means that the minimum standard for windows is an energy rating of C.

KJM has been offering a choice of either E, C, or A-rated windows since 2009. To comply with regulations, we now we only offer C-rated windows or A-rated windows. The cost difference between them is so small that we feel ‘A’ rated frames should be your standard choice.

 

What is Window Energy Rating (WER)?

 

The WER is the objective method used to assess the total energy performance of windows. To determine the energy rating the following is criteria is used:

  • Frame material used (PVC, aluminium or timber)
  • Glass used
  • Air leakage
  • Solar Gain

 

How do window energy ratings benefit me? Free brochure download

 

The BFRC (British Fenestration Ratings Council) rating system is designed to determine a window’s thermal efficiency. It is displayed on a colour-coded traffic-light style label with a scale from ‘A’ (the most efficient) – to ‘G’. This means that you can make a quick yet informed decision when choosing new windows, taking energy conservation into account. With carbon emissions and other environmental issues high on the global agenda, we are all looking for ways to make our homes more energy efficient.

 

Combined factors, such as solar gain, result in the fact that the ‘A’-rated window is energy-positive, meaning it can absorb more energy into the house than it lets out. To see how much money you could save on your energy bills and to find out how significantly you could reduce your carbon footprint, use the ‘Carbon Calculator’ on www.ggf.org.uk.

 

KJM ‘C’-rated windows have a warm edge spacer, are argon gas filled and have low e glass. The enhanced ‘A’-rated window, has the best warm edge spacer on the market, be argon gas filled, soft cost low e glass and the external pane is manufactured from ‘low iron’ glass to improve the solar gain.

 

Spacer bars which conduct less heat at the edge of the glass are referred to as ‘warm edge spacer’

The benefits are as follows:

  • Reduced heat loss through windows
  • Condensation on windows can be reduced
  • Better sound insulation

 

Argon Gas filled sealed units

 

Filling the gap between the panes increases the thermal performance of insulating glazing units is to reduce the conductance of the air space between the layers. Originally, the space was filled with air or flushed with dry nitrogen just prior to sealing. In a sealed glass insulating unit, air currents between the two panes of glazing carry heat to the top of the unit and settle into cold pools at the bottom. Filling the space with a less conductive, slow-moving gas minimises the convection currents within the space, conduction through the gas is reduced, and the overall transfer of heat between the inside and outside decreases.

 

Low-E Glass

 

High-performance Low-E (low emissivity) glass is designed to reduce heat loss and must be used on energy rated windows. There are two types of low e glass, Hard Coat and Soft Coat, we use soft coat glass as it gives the following benefits over hard coat:

  • Better light transmission
  • Better U-Values
  • Enhanced clarity/neutrality.

 

Low Iron Glass

By reducing the amount of iron in the external pane of glass, the solar gain of the window is improved. KJM’s ‘A’-rated windows have this as standard.

 

Triple Glazing

When this web page was first written, we did not sell 44mm triple glazed windows & doors. Today we can improve on our best rated double glazing by over 40% with our Veka triple glazed range. You can find out more information on our web page triple glazed windows.

 

Replacing Old uPVC Windows?

 

If you have old uPVC windows, then they are probably very energy inefficient. Modern ‘A’ rated windows offer considerably better insulation and more secure locking mechanisms. See our free brochure download Replacing your old uPVC windows

Colour Customisation

Our choice of casement styles of window means you can choose from a wide array of finishes, such as woodgrain effect, colours or even white textured woodgrain and all with the same long lasting good looks and weather resilience as the traditional white frames.

Our White, Grey, Anthracite Grey, Black and Brown casement windows are some of our most requested colours. Can’t see the colour you’re looking for? Click below to browse through our range and change to your preferred colour.

 

 

Colour Options
Glass Options
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an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
an example of a window in pre-selected colour
clear arctic autumn chantilly charcoal-sticks contora cotswold digital everglade flemish florielle mayflower minister oak pelerine stippolyte sycamore taffeta warwick
Glass Options
clear
clear
arctic
arctic
autumn
autumn
chantilly
chantilly
charcoal-sticks
charcoal-sticks
contora
contora
cotswold
cotswold
digital
digital
everglade
everglade
flemish
flemish
florielle
florielle
mayflower
mayflower
minister
minister
oak
oak
pelerine
pelerine
stippolyte
stippolyte
sycamore
sycamore
taffeta
taffeta
warwick
warwick

white

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cream

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cream claystone

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pebble grey

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windsor

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sage smooth

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silver d smooth

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agate grey

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kensington grey

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basalt grey mooth

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anthracite grey

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hazy grey finesse

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casment slate grey

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buckingham grey

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slate grey finesse

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chartwell green

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Steel Blue

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dark green

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flernish gold smooth

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dark red

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pyrite

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casement Irish oak

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casement Light Oak

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casement Rosewood

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black brown

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black ulti matt

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Anteak

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Honey Oak

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Swamp Oak

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Triple Glazing Prices

Looking for triple glazing?

Looking for double glazing?

Take a look at our conservatory range 

Whatever decision you make we promise to provide you with a hassle free and honest service. Navigate the menu to see more about KJM Windows, Doors and Conservatories….. thousand of others have!

 

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