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Rooflight Glazing Options

The Alumen range of Aluminium roof lights can be glazed with a variety of glass options. Each type of glass offers different characteristics. Below are the main features to consider when choosing the type of glass most suited to your application.

  • Reduce the amount of heat that can escape from your room
  • Increase the amount of solar gain from the sun
  • Reduce the amount of solar gain from the sun
  • Self cleaning glass
  • Tinted glass

Minimising Heat Loss

All our glazing options incorporate Low E (low emissivity) glass in the double or triple glazed units. This glass has a soft coating to one face (coating on the inside of the unit) which helps to reflect heat back into the room. As standard we use a SGB Planitherm Total + glass as our Low E soft coated glass, however if increased performance is required then we can upgrade to SGB Planitherm One II glass.

Typical U values for Low E glass

Type of Glass* Double Glazed
(6-20-6)
U Value
Double Glazed
(6-16-6)
U Value
Triple Glazed
(6-16-6-16-6)
U Value
SGB Planitherm Total + 1.2 W/m2K 1.2 W/m2K 0.6 W/m2K
SGB Planitherm One II 1.1 W/m2K 1.0 W/m2K 0.5 W/m2K
*Assumes Argon Gas fill in the sealed unit

Solar Gain

Whilst one aspect of the glass is concerned with heat loss (ie limiting heat from escaping through the glazing unit), another aspect is concerned with increasing or limiting the amount of heat gain through the glass. The sun is obviously a natural source of energy, and depending upon your situation it is either desirable to take full advantage of this source of energy and maximise the heat gain through the glass, or conversely if the sun is too hot you may want to limit the amount of solar gain.

The solar gain, or solar heat gain coefficient is the percentage of solar energy that is transferred through the glass. A lower value, typically found in anti-sun glass indicates a glass that limits the amount of heat gain from the sun, whilst a higher value (found in low iron glass) is more energy efficient as it indicates a glass that allows more heat gain through the glass.

As standard we use a Low Iron glass (SGB Diamant) in our glazing units, as most situations require high performing energy efficient windows and doors. However in certain situations you may want to limit the amount of heat gain by the use of an anti sun glass.

Self Cleaning Glass

Self cleaning glass has a special coating applied to the external face that helps to break down dirt and keep the glass clean. The special coating breaks down organic dirt, and by doing so helps to reduce the adherence of inorganic dirt particles. When it rains the water washes both the organic and inorganic dirt particles away leaving the glass notably cleaner than one that has not been coated.

Alumen's Glass Range

The table below shows the most common configurations of glass that are requested. We can supply any type of glass, so if the particular type of glass is not listed then please contact us for further details.

Double Glazed Units

Inner Pane Outer Pane U Value
(6-16-6)
Solar Gain (g)
SGB Planitherm Total + SGB Diamant (Clear Low Iron) 1.2 W/m2K 0.74
SGB Planitherm One II SGB Diamant (Clear Low Iron) 1.0 W/m2K 0.54
SGB Planitherm Total + Self Cleaning Clear 1.2 W/m2K 0.6
SGB Planitherm Total + Self Cleaning Anti Sun Blue / Neutral etc 1.2 W/m2K 0.27 - 0.35
SGB Planitherm Total + Anti Sun Grey / Green / Bronze etc 1.2 W/m2K 0.3 - 0.4

Triple Glazed Units

Inner & Middle Pane Outer Pane U Value
(6-16-6-16-6)
Solar Gain (g)
SGB Planitherm Total + SGB Diamant (Clear Low Iron) 0.6 W/m2K 0.64
SGB Planitherm One II SGB Diamant (Clear Low Iron) 0.5 W/m2K 0.42
SGB Planitherm Total + Self Cleaning Clear 0.6 W/m2K 0.6
SGB Planitherm Total + Self Cleaning Anti Sun Blue / Neutral etc 0.6 W/m2K 0.27 - 0.35
SGB Planitherm Total + Anti Sun Grey / Green / Bronze etc 0.6 W/m2K 0.3 - 0.4

*All units assume warm edge spacer bar and argon gas fill

Schuco Windows and Doors Smart Architectural Aluminium