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Double Glazing

All our steel windows can be installed and supplied with sealed double glazed insulated units to improve thermal efficiency and, where required, comply with Building Regulations Part L (Conservation of Fuel and Power). Glazing is in accordance with BS 8000-7:1990

Due to the wide range of glazing option available (briefly highlighted below) consultation and agreement with the client is vitally important in achieving their thermal performance requirements whilst also achieving an aesthetically pleasing glazing.

Products and Glazing Services
Compliance to Building Regulation Part L 2006
Latticed Windows
Insulated units of between 14mm to 24mm thick
Glass options from - Annealed, Soft and Hard Coat Low-e, Toughened, Coloured, Frosted and Laminated Glass, Solar Control
Historic Glazing – Crown Glass
Insulating Gas – Air, Argon, Krypton and Xenon
Spacer Bars that match the RAL colour of the Slim lined Steel Frames
Application of thermal and solar control films

Longevity

The typical life expectancy of all double glazed units will be from 10 -25 years depending on the environment. We guarantee our units for 10 years.

Re-glazing

We also offer a re-glazing service to replace existing double glazed units that have either broken, been damaged or show signs of condensation on the inside cavity thats resulted from possible failure of perimeter seals.
On listed buildings it is very difficult to get permission to use double glazing and even if successful normally you can be limited to very expensive types of double glazing, we are more than happy to advise in this process.

Building Regulations Part L

Currently the required performance for windows are summarised in the following 4 building regulation Part L 2006 (conservation of fuel and power) documents:

L1A New Dwellings
L1B Existing Dwellings
L2A New Buildings other than dwellings
L2B Existing Buildings other than dwellings

The performance of windows being installed in the respective outlined can be summarised in the following table

Document
U-Value
W/m2
Centre Pane Value
W/m2
L1A
(New Dwellings)
2.2
(maximum avaerage)
N/A
L1B
(Existing Dwellings)
2.0
(whole window)
1.2
Extensions
1.8
(whole window)
1.2
Conservatories
(more than 30 sqm)
2.0
(whole window)
1.2
L2A
(New Non Dwellings)
2.2
(maximum average)
N/A
L2B
(Existing Non Dwellings)
2.2
(whole window)
1.2
Extensions
1.8
(whole window)
1.2
Conservatories
(more than 30 sqm)
2.2
(whole window)
1.2

Typical Performance

The thermal performance (W/m2K) of double glazed units will vary significantly depending on the type of glass and insulating gas used as well the glass and spacer bar thicknesses. Typical performance values show below give an indication of how the requirements of Part L (above) can be achieved based on 22mm sealed units for Argon and Krypton gas.

Note: Insulated Panels consisting of Air do not meet current Building Regulations.

Inner Pane
Outer Pane
Cavity (mm)
Config
Gas
Centre Pane
U-Value W/m2
Float Clear,
Annealed, 4mm
Low-e Annealed, 4mm
14
4-14Ar-4
22mm
Argon
1.19
Float Clear,
Annealed, 4mm
Low-e Annealed, 4mm
14
4-14Kr-4
22mm
Krypton
1.12
Float Clear,
Annealed, 4mm
Low-e Annealed, 4mm
8
4-8Kr-4
16mm
Krypton
1.20

 

Also shown in the table above are the significantly thinner 16mm glazed units offered by Argon gas filled cavities to meet Building Regulation Part L 2006.

For further infomation on our double glazed units, or if you would like to know more on how we can help you comply with Part L please contact us.

General Thermal Performance Data for Double glazed units are shown in the downloadable documents below. (coming)


The Steel Window Company is a Trading style of Fabco Sanctuary Limited.
Registered In England & Wales No. 6552850. Vat No. 931 9093 17
© Fabco 2008 -- Unit 1, Hobbs New Barn, Climping, Littlehampton, West Sussex, BN17 5RE
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