Press release: Schulhaus Lavater, Zuerich
The Lavater School complex in Zurich, originally built in 1896/97 by city architect Gustav Gull in the style of the Swiss National Museum, is a landmark of late‑19th‑century school architecture. As a protected heritage site, its recent refurbishment demonstrates how historic buildings can be sensitively modernised while preserving their original character.
A key focus of the renovation was the restoration of the original timber windows. Specialists in historic window refurbishment carefully upgraded the existing frames to meet today’s energy‑efficiency standards without altering their historic appearance. Modern insulating glass units equipped with Swisspacer Ultimate warm‑edge spacers were integrated into the glazing edge, significantly improving thermal performance while remaining visually discreet.
The upgraded glazing achieves a Ug value of around 1.4 W/m²K, a balanced solution that meets both conservation requirements and economic feasibility. In combination with Swisspacer Ultimate, the glazing edge reaches excellent Ψ‑values, reducing heat loss and lowering the risk of condensation—critical aspects for historic windows with limited tolerance for construction errors.
Beyond energy efficiency, the project also enhances year‑round comfort. Automatically controlled fabric awnings provide summer heat protection, while the improved glazing supports a more stable indoor climate. The renovation shows how even small components such as the spacer bar play a crucial role in delivering sustainable performance in heritage buildings.
Today, the Lavater School stands as a reference project for sustainable heritage refurbishment—proving that advanced technologies like Swisspacer warm‑edge spacers can successfully bridge the gap between monument preservation, energy efficiency and modern educational use.