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A room is not a room without natural light



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Glass in architecture today is more than just an aesthetically-pleasing building material. It is no longer just something you look through or admire; it is a crucial element in a design plan to ensure optimum comfort levels for the residents of the building.

An architect’s decision to select glass for a building has a significant impact on initial as well as running costs of the building. This particularly holds true for modern buildings that are characterized by a high window-to-wall (WWR) ratio. In the words of American architect Louis Kahn, “A room is not a room without natural light.” But can a glass maximize daylight and outdoor views while controlling glare and heat? Of course. Solar-control glass is designed to reduce or prevent unwarranted solar heat from entering the building without sacrificing a clear view of the great outdoors.

“A room is not a room without natural light” – Louis Kahn

Solar-control glass can be installed to keep interiors comfortable by preventing excessive heat build-up in sunny weather, thus obviating the need for costly air-conditioning or blinds.

AllCargo, Mumbai CyberWalk, Manesar Arena Space, Mumbai
(Glass used: SGG Evo) (Glass used: SGG Envision)  (Glass used: SGG Nano)

How does solar-control glass work?

Solar-control glass plays an important role in not just significantly reducing incoming heat but also decreasing energy costs.

Benefits of solar-control glass:

  • It provides enhanced thermal comfort to the occupant by reflecting the excessive heat from the sun
  • It reduces air-conditioner load thereby resulting in increased savings in both energy operational costs and capital investments
  • It lets in optimum daylight, obviating the need for blinds, and affords a great view of the outdoors   
  • It results in energy savings as high as 50% as compared with ordinary glass
  • It filters uncomfortable glare from the sunwhile letting in ample natural light
  • The UV protection prevents upholstery and interiors from fading

Saint-Gobain Glass offers a wide range of solar-control glass. The different glass variants can be used in combination to create a multi-functional glazing that results in low maintenance, noise reduction, aesthetic appeal, and enhanced safety and security.

But how do you differentiate and choose the right one for your needs?

Light-to-solar gain (LSG) is the ratio of the visible light transmittance (VLT) and solar heat gain coefficient (SHGC) of a glass. In absolute percentage terms, a ratio greater than 1 signifies that the daylight passing through the glass is more than the sun’s direct heat passing through it.

Therefore, the higher the LSG ratio, the lesser the heat passing through it.

First generation: SGG Reflectasol

This reflective solar-control glass is best suited for buildings located in the tropical climate zone, where solar heat needs to be controlled in order to keep interiors cool. It reflects the right quantity of sunlight so as to limit glare, while allowing adequate amount of natural light in. Therefore, the need for artificial lights as well as air-conditioners is significantly reduced.

LSG ratio: <1

Second generation: SGG Antelio Plus

This reflective solar-control exterior glass blocks incoming heat radiation from the sun, while allowing in natural light. It can be used in single glazing as protection from extreme weather.

LSG ratio: 0.90 – 1.30 (depending on variant)

Third generation: SGG Cool-Lite ST

This advanced energy-efficient reflective solar-control glass cuts excess heat and optimizes light transmission. The product has been specifically designed for tropical countries like India.

LSG ratio: 0.30 – 1.20 (depending on variant)

Fourth generation: SGG Nano

This high-performance coated glass is characterized by advanced energy-efficient solar control and thermal insulation (low-E) properties. It is ideal for modern architecture that demands exterior glazing solutions with a neutral appearance.

LSG ratio: 1.30 – 1.60 (depending on variant)

Fifth generation: SGG Envision

This green building glass is designed with advanced solar-control and low-E glass properties. It is well known for its spectrally selective solar-control performance.

LSG ratio: 1.40 – 1.80 (depending on variant)

Glass Select tool

The all-new Glass Select, from Glassisgreen (a Saint-Gobain Glass initiative), is a tool that enables you to choose the perfect glass based on its performance specifications including SHGC, U-Value, LSG Ratio, and more.

Find the perfect glass now

Read more about solar-control glass



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