Refurbishment and Restoration

Passeggiata dei Castani

Bozen/Bolzano, Italy

Housing Complex during the Refurbishment Process 1 | Housing Complex during the Refurbishment Process
Multifunctional and prefabricated facade modules made of timber helped a housing complex achieve a low energy standard in a cost-effective and timely manner.
Design: For the European “Sinfonia – Bozen/Bolzano Smart City“ project, a housing complex of 72 affordable apartments was chosen to test a new method for existing buildings to achieve the EU nearly zero energy building (nZEB) standard.

Wood: The concept was centered around the use of multifunctional, prefabricated timber elements with integrated windows and shutters as well as a finished facade made of aluminum and high-pressure laminate. This way, the time required for production, quality assurance, and construction was reduced by 60%. 225 m² of face modules were added to the buildings per day. Thanks to the low emission level during the construction, the tenants were able to stay in their apartments during the entire refurbishment process.

Energy: The project managed to achieve its goals. The new thermal insulation reduced the heating energy demand by a factor of 10, down to 22.5 kWh/m²a from previously 238 kWh/m²a. The CO2 emissions of the building were also reduced, down to 6 kg/m²a. Next to the thermally insulated timber modules, this achievement was also made possible through the use of a photovoltaics and thermal water heating installation on the rooftop, a geothermal heat pump system, and a mechanical ventilation.
New Facade Modules 2 | New Facade Modules
Thermal Insulation at the Prefabrication Stage 3 | Thermal Insulation at the Prefabrication Stage
Assembly of the Facade Modules 4 | Assembly of the Facade Modules
Basic information
Year of Completion |  2016
Investor |  City of Bozen/Bolzano (IT)
Architecture |  Studio Mellano Associati, Turin (IT); Alberto Sasso, Turin (IT); ARCH+MORE Gerhard Kopeinig, Velden am Wörthersee (AT); Manuel Benedikter, Bozen/Bolzano (IT)
Structural Engineering |  Giuseppe Glionna, Turin (IT); Massimo Vettori, Bozen/Bolzano (IT);
Construction Time |  12 months per building
Number of floors |  5
Plot size |  6 400 m²
Gross floor area |  7 456 m²
Construction Costs (netto) |  630 €/m²

Technical aspects
Concept |  Envelope of prefabricated timber modules for existing buildings (reinforced concrete and masonry)
Woodworking |  Carron Bau Srl/Gmbh, Bozen/Bolzano (IT); Aster Holzbau Gmbh, Jenesien/San Genesio Atesino (IT)
Origin of Timber, Certification |  FSC/PEFC
Forestry Value Chain |  Exclusively local companies involved
Energy Efficiency Standard |  CasaClima A
Energy Systems |  Geothermal energy, heat pumps, mechanical ventilation with heat recovery, photovoltaics, thermal water heating
Energy Consumption  |  22,5 kW/m²a (heating energy demand)
U-Value Wall | Roof | Floor | Windows (W/(m²K)) |  0,13 | 0,07 | 0,14 | 0,74

Circular Economy Cost Saving Energy Efficiency

Site Plan Site Plan Facade Facade Floor Plan (Extract) Floor Plan (Extract) Detail: Facade Detail: Facade