Tonschaum Referenzobjekte – Praxisbeispiele

Residential Complex “Werkblock” Bremerhaven

Sustainable façade renovation with Clay Foam

The “Werkblock” residential complex in Bremerhaven is an architecturally and historically significant building complex that was constructed in the 1930s. The residential complex, which comprises over 100 flats, has been a listed building since 2009. The challenge: how can the building be renovated to improve its energy efficiency while protecting its historical substance?

The “Werkblock” residential complex in Bremerhaven is an architecturally and historically significant building complex that was constructed in the 1930s. The residential complex, which comprises over 100 flats, has been a listed building since 2009. The challenge: how can the building be renovated to improve its energy efficiency while protecting its historical substance?

The solution: thermal insulation of the cavity walls with Clay Foam

The mineral insulation system Cavipor^® was used for the retrofitting of the façade. This innovative in-situ foam system was specially developed for the renovation of buildings with double-wall masonry – a construction method that is particularly widespread in northern Germany.

Renovation process

1. Analysis & preparation: Inspection of the cavity layer and identification of drilling points.
2. Insertion of the insulation material: Cavipor^® foam was inserted into the cavity layer through small drill holes. Thanks to its fluidity, it fills even hard-to-reach areas completely and seals itself automatically.
3. Completion & inspection: After hardening, the drill holes were sealed with joint mortar. The historic façade remained completely intact and undamaged – a major advantage for listed buildings.

The result: the perfect combination of heritage preservation and energy-efficient modernisation

The renovation of the Werkblock residential complex shows how modern insulation technology can be seamlessly integrated into historic architecture. Cavipor^® significantly improves energy efficiency without making any visible changes to the façade or structure. It is a solution that combines sustainability, cost-effectiveness and architectural sensitivity.

Technical results:

• U-value of the wall before: 1.7 W/m²K

• U-value of the wall after: 0.5 W/m²K

• Financial amortisation: 5–7 years

• CO₂ amortisation: 4–8 months