ALLGEMEINE INFORMATIONEN RENOVIERUNGS-PROZESS SANIERUNGS-LÖSUNGEN BEWERTUNG

Doragno Castle - Rovio, Ticino, Switzerland

Via Doragno 1

6821

Rovio, Schweiz

Architekt

deltaZERO SA - De Angelis - Mazza Architects

Via Zorzi 18, 6900 Paradiso, Switzerland (CH)

dz@deltazero.net

Ansprechpartner

Dr Arch. Cristina S. Polo López

SUPSI - University of applied sciences and arts of southern Switzerland

cristina.polo@supsi.ch

+41 58 666 63 14

Other Information

Related publications
Magazine "Tuttocasa"

Single-family house, restoration and new building extension. Private residence building (historic not-listed building in Ticino) with NZEB target using also solar renewables energy in an integrated roof solution. The castle of Doragno was born from the transformation of an ancient medieval castle. The original stone walls are highlighted by the large windows that complete the volume of the existing building. An integrated photovoltaic system and solar collectors are installed on the roof.

ALLGEMEINE INFORMATIONEN RENOVIERUNGS-PROZESS SANIERUNGS-LÖSUNGEN BEWERTUNG

Energieeffizienz

45,62 kWh/m2.y

Klimazone Cfb

Höhe über dem Meer 497 m ü.d.M.

Heizgradtage 146

Kühlgradtage 0

Unterschutzstellung nicht geschützt

Ensembleschutz:
Nein

Stufe der Unterschutzstellung:
No LBC protection, Swiss Law on the protection of cultural heritage

Baualter vor 1600

Letzte Sanierung:
2017

Vorhergehende Sanierungen:
1980

Gebäudenutzung Residential (rural)

zusätzliche Nutzung:
NA

Gebäudebelegung:
Discontinuous occupancy (i.e. holiday home)

Anzahl der Bewohner/Nutzer:
6

Gebäudefläche Nettogeschossfläche [m²]: 490,0

Gebäudetyp:
Detached house

Anzahl der Stockwerke:
3

Keller ja/nein:
Ja

Anzahl der beheizten Stockwerke:
3

Bruttogeschossfläche [m²]:
644,0

Thermische Gebäudehülle [m²]:
644,0

Volumen [m³]:
2279,0

NGF Berechnungsmethode:
SIA 416

Bauart

Stone masonry wall

Außen:
Exposed stonework

Innen:
Exposed stonework

Dach:
Pitched roof

+ MEHR - WENIGER

East elevation after interventions © L. Carugo

North elevation after interventions © L. Carugo

South elevation after interventions © L. Carugo

RENOVIERUNGS-PROZESS

Architektur

BESCHREIBUNG

The castle of Doragno was born from the transformation of an ancient medieval castle into a private residence where the existing building, which did not enhance the castle, has been subsequently restored, giving a new breath to the ancient walls of the building, and completed with a new zero-energy building (NZEB) also using renewable solar energy in an integrated roof solution. The original stone walls are highlighted by large windows that complete the volume of the existing building. An integrated photovoltaic system and solar collectors are installed on the roof.

Städtebaulicher Kontext

The castle of Doragno had a strategic location: it was build on a promontory and it was a point of observation and defence along the way to the Mara and Intelvi valleys. It was a part of a path bordered by fortified castles and watchtowers built at regular intervals on the way to the Alps.

Dateien zur Bewertung

General file

Erhaltungszustand

Erhaltungszustand der Gebäudehülle

The building was restored preserving the walls and completing the volume with new materials that with the aim not to drown out the old part of the building, but to enhance it. The building is used as a private residence and consists of two main buildings, one to the west that includes a basement and 2 floors above ground and one to the east that includes 3 floors above ground.

Haustechnische Anlagen vor Sanierung

Defence castle built during the war between Como and Milan (1118-1127). In the last fifty years the building had mono-familiar residential use.

DENKMALWERT

ERHALTENSWERTE ELEMENTE

In building restoration and conservation field, the architects of the project considers that the following aspects need to be preserved: 1: the volume, the shape of the building 2: the skin of the building 3: the history of the building

Denkmalwert und wie er bestimmt wurde

In this project it was chosen to preserve only the medieval part of the building. This choice was made because the interventions done in the sixties do not help to preserve the history of the castle and where even hiding some medieval parts. The cultural heritage office supervisors approved the project and agreed with reflections and considerations from architects. In this project the architects have re-created the shape of the castle using modern materials that differ from the original ones but don't dominate and discretely approach to ancient parts.

Ziel der Sanierung

Renovation + Extension

Special focus in this project has been the conservation of the ancient walls of the medieval castle, considering modern comfort standards with the aim of achieving a building ad a high standard of energy efficiency, NZEB

Gewonnen Erkenntnisse / besondere Erfahrungen

The transformation should respect the past and take into account the fact that the distortion of a territory, without guidelines or without preserving some "key" element, can create disaffection towards the territory itself: we no longer recognize each other, nothing is more part of our experience. It is therefore necessary to evaluate with farsightedness how much and what to preserve of the heritage that the past gives back to us. If this assessment is undoubtedly complex, even how to intervene and how to conserve it are no less so and it will necessarily have to be evaluated case by case. The possibilities are innumerable. The first alternatives we are facing are essentially three: historic buildings can be reused by changing their intended use or they can be reused by maintaining the same destination or they can still be preserved as simulacra of the past to which they belonged. With regard to the actual intervention, in addition to the needs of the client, the principles on which to base the project should be respect for the work, authenticity (not creating a "historical forgery") and consideration of the context in which the building fits.

Beteiligte Akteure

Öffentliche Hand
Ufficio dei beni culturali
Viale Stefano Franscini 30a
Tel.+41 91 814 13 80

Architekt
deltaZERO SA - De Angelis - Mazza Architects
Via Zorzi 18, 6900 Paradiso, Switzerland (CH)
dz@deltazero.net
Tel.dz@deltazero.net

Energieberater
Termoconsult srl
via Ugo Foscolo 2, I-21018, SESTO CALENDE (VA)
roberto.fusetti@termoconsult.info
Tel.+39 0331 92 30 26

Statiker
Chiesa&Partners
via Livio 24, CH-6830, CHIASSO
info@chiesaepartners.ch
Tel.info@chiesaepartners.ch

Haustechniker
GreenKey Sagl - Kim Bernasconi
Via Ceresio 45 CH-6963 Pregassona
info@greenkey.ch
Tel.+41 91 630 64 91

Eingesetzte Software/Berechnungstools

Folgte die Sanierung einer spezifischen Methode? SIA 380/1

Energiebilanz SIA 380/1
Hygrothermische Bewertung No
Life Cycle Analysis (LCA) No
Anderes No

Tutto casa p.1 Tutto casa p.2 Tutto casa p.3

SANIERUNGS-LÖSUNGEN

Außenwände

Stone masonry wall

The restoration project started from the right premise of completing what remained of the walls of the tower to return the shape so that in the surrounding landscape the building of the past once again became legible.

In this project we have re-created the shape of the castle using modern materials that differ from the original ones but don't dominate and discretely approach to ancient parts.

Wall: detail with internal wall © Delta zero

U-Wert (vor Sanierung) [W/m2K]: 0,9 W/m²K U-Wert (nach Sanierung) [W/m2K]: 0,24 W/m²K

Mehr Details

Aufbau Bestandswand

Stone - Stone wall:
500 mm

Plaster - Plaster (internal):
30 mm

Aufbau sanierte Wand

Stone - Stone wall (extension stone + brick):
500mm

Insulation - Insulation:
100 mm

Other - Vapour barrier:
1 mm

Air gap - Air layer:
30 mm

Plaster - Plasterboard (internal):
25 mm

Fenster

Glazed-facade

The existing wood-windows with single glass have been replaced with aluminium-windows with thermal cut and triple glazing

Windows

Detail small window section © Delta zero

Bestandsfenster U-Wert Glas [W/m2K]: 5,0 Neues Fenster U-Wert Glas [W/m2K]: 0,6 Bestandsfenster U-Wert Rahmen [W/m2K]: 3,0 Neues Fenster U-Wert Rahmen [W/m2K]: 1,4

Mehr Details

Fenstertyp Bestand	Different types fo small windows
Verglasungsart Bestand	Single
Verschattung Bestand	Outer shutter
Ungefähres Einbaujahr	1980

Neuer Fenstertyp	Different types of windows: small ones and glazed-facade
Verglasungsart des neuen Fensters	Double and triple
Verschattung des neuen Fensters	Roller blinds
Neuer Energiedurchlassgrad g [-]	0,45

Weitere Maßnahmen

DACH

ERDGESCHOSS

DACH

the coverage of the west wing has remained unchanged, while that of the east wing, which had a single sloping slope towards the north, was carried out with a double pitch

The 20th century works were demolished and the new parts were made of steel and glass, keeping the lines of the new volumes as simple as possible.

U-Wert (vor Sanierung) [W/m2K] 1 U-Wert (nach Sanierung) [W/m2K] 0,2

Mehr Details

Aufbau Bestandsdach

Tiles - Old tiles:
50 mm

Other - Air:
50 mm

Other - Wood:
30 mm

Other - Insulation:
50 mm

Other - Wood:
30 mm

Aufbau saniertes Dach

Other - PV glass panel:
8 mm

Other - Insulation Isotec:
100 mm

Other - Insulation Celenit:
75 mm

Other - Wood:
27 mm

ERDGESCHOSS

Existing floor were complietely removed and replaced

The 20th century works were demolished and the new parts were made of steel and glass, keeping the lines of the new volumes as simple as possible.

U-Wert (vor Sanierung) [W/m2K] 0,9 U-Wert (nach Sanierung) [W/m2K] 0,25

Mehr Details

Aufbau Boden/Kellerdecke im Bestand

Other - Floor tiles:
20 mm

Concrete slab - Concrete:
150 mm

Other - Stone:
100 mm

Aufbau Boden/Kellerdecke nach Sanierung

Other - Stoneware tiles:
30 mm

Other - Plaster boards:
40 mm

Other - Air layer:
220 mm

Concrete slab - Concrete:
180 mm

Insulation - Double layer :
120 mm

Other - Stone:
100 mm

HVAC

HEIZUNG

LÜFTUNG

KLIMATISIERUNG

BRAUCHWARMWASSER

HEIZUNG

The new heating system consists of a reversible air-water heat pump powered by the photovoltaic system on the roof. The thermal energy produced that is used to heat, cool and produce domestic hot water becoming completely free and renewable. Distribution is made both from radiating floors and fans. The raised floor (Floortech patent, deltaZERO concept), dry laid and demountable, thus giving a high future flexibility, is composed of two functional layers, one load-bearing and the other thermally active: the lower layer, thermo-active, consists of radiant panels of the reversible heating and cooling system.

Being a new system, which integrates into the newly constructed building, it does not compromise the existing castle building, there are no compatibility and conservation problems.

Mehr Details

	Heizungssystem nach Sanierung	zusätzliches Heizungssystem nach Sanierung
Art der Heizung	Heat pump	Solar Thermal
Brennstoff	Electricity	Sun
Wärmeverteilung	Radiating floor	Radiating floor
Nennleistung	44.8 kW	- kW

LÜFTUNG

A mechanical ventilation system with heat recovery (MHVR) was installed which bring fresh air into all habitable areas without letting the heat escape. Stale air contaminated with humidity, toxins and smells is extracted from grilles in toilets and wet rooms. By continuously supplying preheated air into living areas and extracting contaminated air from wet rooms, you create a whole house ventilation system. Fresh air is fed directly from outside into the ventilation system recovering the heat taken from the extracted air that is used to warm the fresh filtered air in the heat exchanger and then enters the ducting system previously preheated.

Being a new system, which integrates into the newly constructed building, it does not compromise the existing castle building, there are no compatibility and conservation problems.

Basement plan with ventilation system © DeltaZero

Ground floor with ventilation system © DeltaZero

Mehr Details

Aufbau Bestandsdach	Neues Lüftungssystem
Lüftungstyp	Centralized
Type flow regime	Overflow
Wärmerückgewinnung	Ja
Feuchterückgewinnung	Nein
Nennleistung	250-1200 W kW
Elektrische Leistung	1,2 kW
Regelung	Remote control (RC)

KLIMATISIERUNG

Electric reversible air-water heat pump powered by the photovoltaic system on the roof. By reversing the operating cycle, it is possible to cool the rooms during the hot season by using the same operating principle.

Being a new system, which integrates into the newly constructed building, it does not compromise the existing castle building, there are no compatibility and conservation problems.

Mehr Details

	New cooling system
Type	Heat pump
Distribuition system	Fan
Nominal power	40 kW
Electric power	14,6 kW

BRAUCHWARMWASSER

The production of domestic hot water is provided by the solar collectors integrated in the south pitch roof in the new building.

The selection of roofing materials allows the integration of solar systems in order to make a uniform surface, that consider the aesthetic characteristics of the solar thermal panels and their geometry and position in the roof. Solar thermal modules are coplanar to the roof and the similar aspect to solar photovoltaics pannels in order to minimize their visibility from the sorrunding enviroment.

Mehr Details

	Brauchwarmwasserbereitung nach Sanierung
Typ	with heating system
Brauchwasserspeicher	Ja
Wärmerückgewinnung aus Brauchwasser	Nein

ERNEUERBARE ENERGIE

Solarthermie

Photovoltaik

Solarthermie

Solar thermal collectors has been integrated in the south-east roof pitch for the production of DHW domestic hot water and for heating.

Solar thermal collectors are perfectly integrated in the roof.

Mehr Details

	SolarThermal System
Type	Flat collector
Collector area	5,0 m²
Elevation angle	15,0
Azimuth	145,0
Overall yearly production	3780,0 kWh
Heating_contribuition	0,0 kWh
DHW contribuition	3780,0 kWh
Cooling contribuition	0,0 kWh

Photovoltaik

Photovoltaic system integrated in the south-east and south-west slopes of the roofs.

The photovoltaic system is perfectly integrated in the roof.

Mehr Details

	Photovoltaic System
Type	Monocrystaline
Collector area	100,0 m²
Total nominal power	16,4 kW
Elevation angle	15,0
Azimuth	45,0
Overall yearly production	16400,0 kWh
Heating contribuition	0,0 kW
DHW contribuition	0,0 kW
Cooling contribuition	0,0 kW
Lighting contribuition	0,0 kW