Triple glazing consists of three glass panes separated by two spacer bars, forming two gas-filled cavities. Argon or krypton gas is typically used to fill these cavities, as noble gases significantly reduce heat conduction compared to air. At least two panes receive a low-emissivity (Low-E) coating. Typical Ug values range between 0.5 and 0.7 W/(m²K). Triple glazing is standard in passive houses and low-energy construction. However, compared to double glazing, the weight increases considerably, requiring heavier-duty hardware and more robust frame profiles. Additionally, the solar energy transmittance (g-value) is slightly reduced, which must be considered during the design phase.