Montagna - Montan, Italy
State of repair
Aim of retrofit
Dr. Arch. David Stuflesser
Petlinstraße/Via Petlin 18, I-39046 St.Ulrich, Ortisei
Tel.T+F 0039 0471 786517
Stone masonry with lime plaster
Since the farmhouse is located in a climatically favorable and sunny location, it was deliberately decided not to insulate the exterior walls, which are coated with beautiful, historic plaster, both inside and out. The users do guarantee a sufficiently dry indoor air with careful natural ventilation and avoid this the mould risk, which the relatively cold surfaces especially in corners would otherwise cause.
The U-value given is better than it would result purely mathematically from the thermal conductivity value of the natural stone and takes into account the mortar components and air inclusions. It was not measured on site, but is based on values from the literature and was indirectly verified with the consumption values.
In the attic, that was not renovated as such, an additional residential unit was installed for the harvest workers. 55m ² divided into living room, two bedrooms and bathroom,. The external walls were built as drywall with 16cm soft wood fiber board - two thirds are "inner walls" (towards the attic), one third real outer walls .
In purely mathematical terms, the unit has an "efficiency of the building envelope" according to the Klimahaus of 37 kWh / m² - in fact, the unit is only used from May until the end of November.
Wooden windows from the local carpenter
additional windows in the roof
The windows in the young family's apartment were renewed. When replacing the windows, special care was taken not to change the view of the courtyard: The decision was therefore made to use two-sash double-glazed windows, what allowed the very narrow, historical-looking frames. The windows were built by the local carpenter and replace 20 year old one-sash windows.
The historic Bifora windows from the late Renaissance in the Rittersaal on the 2nd floor were not changed. However, the room is not in constant use.
Four additional windows were used to illuminate the house-in-house box on the top floor in accordance with the preservation authorities.
Apart from that, the roof remains untouched.
The ceiling to the attic was mostly insulated with ~25cm insulation during the renovation - this reduced the losses from the apartment to the attic (which originally accounted for 25% of the apartment's heat losses) from ~8'500 kWh/year to ~1'500 kWh/year, i.e. to less than one fifth.
The attic itself was preserved as a cold room - except for the built-in house-in-house box for the harvest helpers
The ground floor structure was changed fundamentally due to the underfloor heating that was inserted in every room, except for the cross vault and the central hall. The original terrazzo floor was imitated in the vaulted entrance. In the remaining rooms, the original wooden floorboards were sanded down to ensure that the historic doors were opened.
both aspects of monument preservation and sustainability were taken into account.
The historic interior doors were removed and repaired with skilled craftsmanship.
The existing paint of the interior doors was leached and the cracks were puttyled.
DOMESTIC HOT WATER
The old room stoves were replaced by a central pellet / wood stove. In the living room, the existing stove got a new look, which integrates well into the general concept.
In the apartment of the old farmers only kitchen and bathroom are heated (about 30m² of the total 140m²), the accommodation for the harvesters in the attic is used only until the end of November - but here the hypothetical heating demand for a whole winter is shown.
By installing the pellet / wood stove, the hot water treatment was also renewed.
Nature conservation is guaranteed through the sustainable raw material wood from their own woods.
RENEWABLE ENERGY SYSTEMS
In summer, mainly pellets are used for the preparation of domestic hot water.
In winter for heating wood from their own forest.
Voluntary certificates: No
Primary Energy 181 kWh/m2.y
Consumption_estimation_Before: 230 kWh/m2.y
Consumption_estimation_After: 135 kWh/m2.y
Consumption_estimation_Calculation_method: see "energy efficiency", here DHW included
Consumption_estimation_Before: 260 kWh/m2.y
Consumption_estimation_After: 181 kWh/m2.y
Description: The user is able to monitor the energy and regulate it if necessary.
The temperature is kept relatively constant due to the underfloor heating. However, there are different temperatures in different rooms.
There were no financial reasonings important for the renovation, decisions were made mostly based on the user needs. The total cost of the renovation was approx. 340,000 €.
emissions_at_use_stage_before_intervention: 18 per m2
emissions_at_use_stage_after_intervention: 11.3 per m2