House Moroder

Renovation

  • Building Type : Isolated or semi-detached house
  • Construction Year : 2015
  • Delivery year :
  • Address 1 - street : Horazstraße 39100 BOZEN, Italy
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 96 m2
  • Construction/refurbishment cost : 500 000 €
  • Cost/m2 : 5208.33 €/m2
  • Primary energy need :
    45 kWhpe/m2.year
    (Calculation method : Other )
Energy consumption
Economical buildingBuilding
< 50A
A
51 à 90B
B
91 à 150C
C
151 à 230D
D
231 à 330E
E
331 à 450F
F
> 450G
G
Energy-intensive building

The historic residential building in the middle of the city of Bolzano, which was built in 1926 near the old town, served for many years as a rental house for 3 apartments. After the acquisition by the current owner Mr. Moroder, important energetic renovation measures were arranged. The main goal of the renovation was the preservation of the visual image in connection with the best possible energy saving.

Interior Insulation

In order to leave the facade untouched, all exterior walls in the interior were provided with a 10 cm thick interior insulation. The material TecTem from Knauf, made of perlite, was specially selected for use in contact with residents due to the natural material. Before the insulation was applied, layers of plaster were removed from the inner walls and the floor covering at the joints to the walls removed a few centimeters in order to be able to run the insulation underneath. This means that there should be no cold spots that could cause heat loss. 

Ventilation

To guarantee good air quality at all times and avoid wasting heat with every ventilation, all three flats were each equipped with their own ventilation system with heat recovery: the air ducts were led through the suspended ceiling, and the ventilations unit themselves were placed in the bathroom.

See more details about this project

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Data reliability

3rd part certified

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Photo credit

Photos: Arch. Michael Tribus / Helmuth Moroder / Floor plan: Arch. Augusto Visintini and Michael Tribus

Contractor

    Helmuth Moroder

Construction Manager

    Arch. Augusto Visintini

Stakeholders

    Thermal consultancy agency

    Arch. Michael Tribus Bozen/Italy

Owner approach of sustainability

The aim of the refurbishment was to improve the quality of life for the residents in harmony with the preservation of the structure of the exterior façade from the point of view of the best possible energy efficiency. For this purpose, only energy measures were taken inside the building to reduce heating costs.

Architectural description

The residential building is a solid construction as a rental house with three apartments on one full floor each and an interior staircase. In addition, there is the possibility to expand the existing attic if necessary, but this was not the basis of the redevelopment. In the basement are the technical rooms and central heating system.

The house is located in a residential area with mostly newer buildings, all built later than the existing house. The neighborhood is close to the old town with good access to shopping and restaurants. The Petrarca Park, located on the Talver River, is a 10-minute walk away.

The original appearance of the facade was to remain untouched. The preservation of the historic appearance of the windows, as well as the stick frames, was in the foreground. For this purpose, the exterior walls were not stressed, but an interior insulation was chosen throughout the house. The new windows were designed to match the original windows, so that there is no visible difference in appearance when viewed from the outside. The interior staircase, as well as the entrance door was not changed. In order to create a thermal bridge, flank insulation was applied to the walls lying in the apartments. In the stairwell was installed wall heating under plaster.

If you had to do it again?

If the interior insulation is carried out consistently, even across the windows and interior walls, with the appropriate material thickness, the energy efficiency is just as high as with exterior insulation. Comfort in the interior is created by a warm surface temperature of the walls, regardless of whether it is an exterior or interior wall. Therefore, a constant room temperature is the ideal way to create a comfortable ambience. Due to a very strict and well thought-out organization of the craftsmen, the time frame of the renovation work could be kept to the day and a move-in was possible on the planned day.

Building users opinion

Since a cooling and heating system is installed throughout the building after the renovation, the room temperature inside can be kept at a constant, comfortable level. This has greatly improved the comfort in the living spaces, as fluctuations in the outside temperature are no longer noticeable.
The newly installed ventilation system ensures clear, fresh air in each apartment. Since this was installed separately per floor, it can be managed as needed. An automatic exchange of all air is currently performed every 2 hours, but can be increased or decreased as needed. Noticeable to the occupants is also the reduced amount of dust in the air.

Energy consumption

  • 45,00 kWhpe/m2.year
  • Other

  • 356,00 kWhpe/m2.year

Envelope performance

  • 0,42 W.m-2.K-1

Systems

    • Heat pump
    • Heat pump
    • Radiant ceiling
    • Heat pump

    In order to guarantee good air quality at all times and at the same time avoid wasting heat with every ventilation, all three flats were each equipped with their own ventilation system with heat recovery: The air ducts were led through the suspended ceiling, and the ventilation unit themselves were placed in the bathroom.
    No holes had to be drilled in the façade to supply the fresh air and remove the stale air: The supply and exhaust air is guided via a custom construction in the bathroom window, inconspicuously housed in the area of the former tilting window above the transom.

    Type ventilation system: Decentralized
    Type flow regime: Overflow
    Heat recovery: Yes
    Humitidy recovery: No
    Nominal power: 0,27 kW
    Electric power: 0,27 kW
    Control system: Continue, 5 control points (30-150 m3/h)

GHG emissions

  • 24,00 KgCO2/m2/year
  • CasaClima protocall

Construction and exploitation costs

  • 500 000

Urban environment

The house is located in a residential area with mostly newer buildings, all built later than the existing house. The neighborhood is close to the old town with good access to shopping and restaurants. The Petrarca Park, located on the Talver River, is a 10-minute walk away.

Building Environmental Quality

  • indoor air quality and health
  • comfort (visual, olfactive, thermal)
  • energy efficiency

The Moroder House, dating from the 1930s, is one of the last remaining of its kind in Bolzano. The building is not listed, yet it was the owner's wish to preserve the exterior appearance with the historic plaster surfaces. Despite these preconditions, the 2015 renovation made it possible to significantly reduce the energy demand - by a factor of 9! Among other things, the interior insulation and highly efficient windows with triple glazing were key factors in achieving this goal. The heating requirements are covered by a heat pump. The highly efficient ventilation system ensures both the safety of the construction and a healthy indoor climate.

Contest categories

Low Carbon

Low Carbon

Green Solutions Awards 2020-2021

 Energy Efficient renovation of historic building

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