Glass Design

Sealed Units

Glass is a good insulator but it would need to be very thick as a single pane in a window to have much effect. So rather than have thick glass in your windows it is better to have two panes of glass with an air or gas space between them. The bigger the air space, the less heat is lost, up to an optimum of 20mm.All well designed and well fitted double glazed units significantly reduce the intrusion of unwanted noise. The greatest change in sound insulation occurs for cavity widths between 50-150mm.By specifying glasses whose thickness differ by at least 30%, resonance effects are suppressed and the acoustic benefits are, therefore, maximized.

The benefits of having Double-Glazed Units

  • Heat loss through single glazing will be at least halved with double glazing
  • Draughts through windows caused by sinking cooled air will be less
  • Rooms will be warmer.
  • Outside noise can be reduced
  • Condensation can be reduced
  • Increases the saleability of the property
  • Savings on fuel bills

Glazing Options

  • Ordinary glass called Annealed or Float glass
  • Safety Glass This can be either Toughened, Laminated, Safety Wired Glass or Annealed glass with safety film applied to it. Safety glazing is mandatory for new installations within 800mm of the floor in windows and partitions, and within 1500mm of the floor in doors and side panels. Glazing is marked in the corner with BS6206.
  • Security Glass Laminated glass or Annealed glass with film applied to it.When security glass is installed you must ensure there is an emergency escape route in case of fire.
  • Low Emissivity glass or Low E glass The glass must be used in a double glazed window so that the special reflective coating, which is always placed inside the cavity, is protected from any damage
  • Decorative glass This can be Opaque, patterned, Stained, Sandblasted or Etched.

In addition to the above standard glazing options there are a number of further choices to be considered, An advanced, high performance Low E Glass that allows a clearer view through the glass can be used, traditional Low E glass has a yellow tint.Self-cleaning glass, Not 100% maintenance free but it will not need to be cleaned as frequently or thoroughly as conventional glass.

Argon Gas filled units are used to improve the thermal and in some cases the acoustic properties of the double glazed unit. The introduction of gas into the cavity of a double glazed unit reduces the heat conductance between the panes, helping to keep more heat in during the winter and out in the summer. As a result living and working conditions become more comfortable the whole year round. The thermal insulation is further improved by using a Low e energy saving glass on one side of the sealed unit.

This combination of Argon Gas and Low e energy saving glass can achieve an improvement in thermal performance in the region of 50% over and above that of a standard sealed unit. The standard gas used for thermal insulation is Argon. Apart from its heat insulation properties, Argon is non-toxic, sunlight stable, non corrosive, colourless and odourless.

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