What is an Insulating Glass Unit?
An insulating glass unit (IGU) is a multi-layered structure consisting of two or more glass panes that are hermetically sealed together using spacer bars. The space between the glass panes is called a cavity and can be filled with air or an inert gas (argon, krypton).
Main Functions of Insulating Glass Units:
- Thermal Insulation: Reduces heat loss in cold weather and prevents overheating in the summer.
- Sound Insulation: Reduces external noise levels.
- Protection from Weather Elements: Protects the interior from precipitation, wind, and dust.
- Aesthetic Function: Adds a modern look to buildings.
Types of Insulating Glass Units by Number of Cavities:
- Single-Cavity: Consists of two glass panes. The simplest and cheapest option.
- Double-Cavity: Consists of three glass panes and two cavities. Provides better thermal and sound insulation.
- Triple-Cavity: Consists of four glass panes and three cavities. The most energy-efficient, but also the most expensive.
Types of Glass for Insulating Glass Units:
- Float Glass: Standard transparent glass used for most IGUs.
- Energy-Saving Glass: Has a special coating that allows visible light to pass through but blocks infrared radiation, reducing heat loss.
- Multi-Functional Glass: Combines the properties of energy-saving and sun-protection glass.
- Tempered Glass: Offers increased strength and safety, as it breaks into small, safe pieces upon impact.
- Laminated Glass (Triplex): Consists of two or more glass panes bonded together with a polymer film, providing high safety as the fragments are held by the film upon breakage.
Spacer Bars:
Spacer bars are profiles placed along the perimeter of the IGU, forming the cavity. They are made of aluminum or plastic and may have a special silica gel coating inside to absorb moisture and prevent condensation.
Cavity Filling:
The cavities of the IGU can be filled with air or inert gases (argon, krypton). Inert gases are denser than air, enhancing the thermal insulation properties of the IGU.
Marking of Insulating Glass Units:
The marking of IGUs typically includes information about the thickness of the glass, the number of cavities, the type of glass, and the cavity filling. For example, 4-16-4 means the IGU consists of two glass panes, each 4 mm thick, separated by a 16 mm cavity.
Choosing an Insulating Glass Unit:
The choice of an IGU depends on various factors such as:
- Climatic conditions of the region
- Orientation of windows
- Requirements for thermal and sound insulation
- Budget
Important Recommendations:
- Height of the IGU: For IGUs over 2000 mm in height, it is recommended to use tempered glass for increased safety.
- Floor-to-Ceiling Windows: For floor-to-ceiling windows, tempered glass is also recommended.
- Preventing Glass Shattering: To prevent glass shattering on people, the exterior glass of the IGU should be laminated.
Conclusion:
An IGU is an important element of modern windows that affects the comfort and energy efficiency of a building. A properly selected IGU will provide warmth, quiet, and safety in your home.
Note: This article is for informational purposes only and is not a substitute for professional consultation. For the optimal selection of an IGU, please contact us through the feedback button.
