Window Glass

Window Glass How much light is transmitted through a pane of window glass? (percent)? When light strikes glass perpendicularly, about 6.5% is reflected at each surface. How much light is transmit...


Window Glass

Window Glass
How much light is transmitted through a pane of window glass? (percent)?

When light strikes glass perpendicularly, about 6.5% is reflected at each surface. How much light is transmitted through a pane of window glass?

The first answer is a good approximation, and you should choose it if you think that's what the writer of the question expects. But there is an infinite series of reflections within the glass. With each pair of these reflections, the 6.5% reflected at the 2nd surface bounces back to the 1st surface where 6.5% of that bounces back to the 2nd surface and 93.5% of that is transmitted. This process repeats without end.
So total transmission coefficient n = 0.0935*(0.0935(1+0.065^2+0.065^4+ ...))
which ~= 0.8777643654.



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Tips for Choosing the Right Glass for Your Home

Glass can perform many different roles, from making a home more comfortable and attractive to ensuring security and privacy - it's simply a case of knowing what to ask for.

What are Your Requirements?

Consider the room’s function and ask the right questions: Will your priority be maintaining the temperature throughout the year? Is there a high level of external noise or will the area pose cleaning problems? It may be that the glass is in a position where you want natural light or to limit vision from one space to another?  Careful consideration of your glass options in the first instance can add real benefits in the long-term.

Conservatory Glass

Conservatories can be cold in the winter and over-heat in the summer so when selecting glass, it’s vital to consider how much sun will enter the room. If building on a wall that collects a lot of sun, choose a solar control glass which helps reduce the amount of solar heat gain. Also ensure that you have plenty of ventilation, particularly in the roof, to let heat out and prevent it becoming a greenhouse.

It is important to keep your conservatory warm without wasting energy. Installing Insulating Glass Units (IGUs) with a low emissivity coating and argon gas filling can help extend the number of months that your space can be comfortably used; by reflecting heat back into the room, maximising the use of available free heat and therefore generally improving comfort.

Windows Glass

Windows can lose a lot of heat, but this can be overcome by fitting energy efficient glazing. Choosing window glass with a low-emissivity coating such as Pilkington K Glass™ which is designed to reflect heat back from fires and radiators into the room; will greatly improving its thermal efficiency and also maximise the use of the available heat from the sun, helping to improve  energy efficiency and  therefore helping to reduce heating bills.

Your biggest concern may be reducing external noise levels. There are many window glass solutions to help combat this common problem for both modern and older, more traditional properties, but double glazing is only one option. New windows have the benefit of good seals when correctly installed and there are a range of glass types, some with specially developed laminated constructions to combat noise. IGUs with two different thicknesses can also have a marked improvement

Door Glass

Glazing in internal and external doors can provide added light and a sense of space without compromising on safety, security or privacy.

For external doors, think about the degree the doors need to act as a barrier between the outdoors and the inside of the home. If the door may be vulnerable, ask about burglar resistant doors and grades of laminated glass specially developed to resist entry for longer. For internal glass doors there are impact resistant grades of glass with and without levels of privacy.

Glass in and around doors within and below 1500mm from the floor needs to be impact resistant.  There are two common types of safety glass available:

  • Toughened glass - Up to five times stronger than ordinary glass and shatters into small, safe granular pieces when broken, perfect if you have lively young children
  • Laminated glass - Two pieces of glass bonded with a clear plastic interlayer, so if it cracks or gets broken, the glass stays in position, reducing the risk of injury. Also ideal for crime prevention.

You can also get fire resistant glass for doors and screens in areas where fire protection is needed such as upper floors and doors to garages.

Roof Conversions / Skylight Glass

Converting roof and loft space is a popular way to transform a home, but placing windows into hard-to-reach areas such as a loft can make cleaning challenging.

Glass is available with self-cleaning properties that can vastly reduce the time spent on upkeep and also reduce the dangers of cleaning glass in hard-to-reach areas. Using daylight and rainwater to breakdown and wash away organic dirt, it continually cleans itself and provides a clearer view, leaving windows looking cleaner for longer. There is also the option of blue tinted glass to improve aesthetics and provide solar control, creating a blue sky view all year round.

Your Choice of Products Has Never Been So Good

Replacing or installing new glazing into a home can provide enhanced appearance, energy-saving and comfort. The key is to do your research and get the right glass for the relevant area.

About the Author

Leading glass manufacturer, Pilkington Glass presents a range of glass solutions to use in various locations within your home. Their self-cleaning and solar control glass solutions are ideal for your conservatory, door, skylight and window glass needs.

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