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    Triple IGUs with Thin Glass: New Opportunities in Renovation Projects

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    Sarah Hummelsberger on Aug 13, 2026, 9:18:23 AM
    Sarah Hummelsberger

    When existing windows need to become more energy-efficient, conventional solutions often reach their limits. Triple insulating glass with thin glass enables an improvement of thermal and acousting insulation values with minimal intervention while maintaining high performance.

    HOW THIN GLASS CREATES NEW OPPORTUNITIES IN Triple IGUs

    Requirements for energy efficiency are continuously increasing, while existing buildings often offer little scope for structural modifications. Particularly with existing window frames, large glazing areas, or listed buildings, replacing complete systems is often complex, not economically viable or even prohibited. 

    The use of thin glass in triple insulating glass offers a practical alternative. Especially when upgrading existing window frames originally designed for 2-pane insulating glass, the available installation depth is limited. By using 1 mm thin glass instead of a conventional 4 mm centre pane, 3 mm of overall unit thickness can be saved. This gained installation depth can be utilised for wider pane gaps. Larger pane gaps improve thermal insulation and enable favourable Ug values despite a compact design. As a result, a high-performance triple insulating glass unit can be integrated into existing frames without requiring modifications to the frame construction.

    Thin glass therefore combines several advantages: lower weight, reduced unit thickness, and high energy efficiency – particularly in renovation projects where existing frames are intended to remain in use.

     

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    KEY ADVANTAGES OF THIN GLASS TECHNOLOGY 

    One major advantage lies in its ease of implementation: in many cases, simply replacing the existing glazing is sufficient. This results in less intervention in the building structure – an argument that is becoming increasingly important in both residential construction and sensitive projects.
     
    • Minimal intervention: In many cases, only the glass needs to be replaced
    • Cost efficiency: Reduced effort compared with a complete replacement
    • Preservation of the building's character: Existing components remain in place
    • Energy efficiency: Improved thermal performance without structural modifications

    TYPICAL APPLICATIONS
    • Renovation of existing buildings
    • Applications in heritage conservation
    • Residential construction with large glazed areas
    • Replacement of glass in existing windows without frame replacement

     

    SELECTING THE RIGHT THIN GLASS

    Not all thin glass is the same. In addition to thin standard glass (soda-lime glass) with thicknesses down to 1 mm, even thinner boron aluminosilicate glass products with thicknesses of approximately 0.5 mm are available on the market. Due to its special glass composition and manufacturing process, boron aluminosilicate glass offers very high strength even without tempering. One disadvantage is the handling of glass waste during production and recycling at the end of its service life. Strict separation of the different glass types is essential to enable reintroduction into the recycling loop.

    The use of thin glass made from conventional soda-lime glass allows joint recycling together with the two outer panes and helps improve resource efficiency. It should be noted that, in this variant, tempering of the glass may be required. Local, country-specific building regulations and standards must be observed.

     

    CHALLENGES IN THE PRODUCTION OF Triple IG WITH THIN GLASS

    The integration of thin glass into triple insulating glass units places increased demands on the entire production process. While the fundamental structure of a triple IGU remains unchanged, the reduced glass thickness affects nearly all processing steps.
    In triple insulating glass, thin glass is generally used as the centre pane and manufactured in smaller dimensions than the two outer panes. This centre pane must be slightly lifted (similar to the production of 4-sided stepped units) to ensure that the edge of the centre pane is completely embedded in the edge seal and is no longer visible after production. This design protects the thin glass from mechanical stresses in the edge area and ensures the long-term functional reliability of the insulating glass unit.
     
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    1. HANDLING AND TRANSPORT

    Thin glass is significantly more sensitive to mechanical stress than standard glass. Adapted handling procedures are therefore required already in internal logistics:
    • Reduced contact forces on grippers and transport elements
    • Optimised acceleration and deceleration profiles
    • Minimisation of micro-deformations and vibrations
    • Prevention of edge damage
    Challenge: Due to its lower stiffness, glass panes can bend more easily. This requires more precise process control and, where necessary, adapted support and guiding systems.
     

    2. WASHING AND CLEANING PROCESS

    Material thickness also plays a decisive role during washing:
    • Fine adjustment of brush pressure and brush hardness
    • Adapted drying parameters to prevent distortion or uncontrolled movement of the pane
    • Ensuring consistent surface quality
    Challenge: Excessive mechanical pressure can cause surface damage or stress, while insufficient cleaning can impair the quality of subsequent bonding.
     

    3. SPACER AND ASSEMBLY PROCESS

    Additional requirements arise when assembling the insulating glass unit:
    • Precise positioning of the panes despite reduced inherent rigidity
    • Accurate alignment of the spacers
    • Ensuring consistent spacing between panes
    Challenge: Thin glass exhibits higher flexibility, increasing the risk of deformation during spacer application. This must be prevented through controlled process parameters.
     

    4. GAS FILLING AND SEALING

    Hermetic sealing is a critical quality factor:
    • Uniform and precisely positioned application of primary and secondary sealants
    • Prevention of local stresses within the edge seal
    • Encapsulation of the thin centre pane within the secondary sealant
    Challenge: Due to the altered structural behaviour of the unit, thin-glass constructions are more sensitive to thermal loads and stresses within the edge seal. The use of suitable thin glass and a clean, repeatable sealing process are therefore essential.
     
    5. QUALITY CONTROL AND PROCESS STABILITY
    The combination of reduced thickness and high end-quality requirements makes continuous quality monitoring essential:
    • Optical inspection for deformations and surface defects
    • Verification of geometry and parallelism
    • Long-term stability of the insulating glass unit

     

     

    AVAILABILITY & FURTHER INFORMATION

    The processing of triple insulating glass with thin glass is part of modern insulating glass solutions and is continuously being further developed. LiSEC also offers corresponding solutions in this field. For project-specific requirements or technical details, further information and contacts are available:

    Summary
    Triple insulating glass with thin glass opens up new possibilities for renovation projects. Although technically demanding in processing, it provides clear advantages in practical application. The decisive factor is the precise coordination of all process steps to ensure stable and sustainable quality.

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