Glaserhaus - Affoltern im Emmental, Switzerland

Eggerdingen 7

3416

Affoltern im Emmental, Schweiz

Architekt

Anliker Christian, Arch/Innenarchitekt SWB
Gerechtigkeitsgasse 73, 3011 Bern
ch.anliker@bluewin.ch
+41 31 311 49 06

Besitzer

Christian & Elisabeth Anliker
Eggerdingen 7, 3416 Affoltern
ch.anliker@bluewin.ch
+41344350033

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

Visits
Contact the Owner

View from south-west © C. Martig
The aim of the project and the associated construction measures is to repair the existing and restore the original condition. The floor plans will be spatially and functionally separated, with the aim of consistently uncovering the core building from 1765 on all floors. This restoration is connected with the aim of preserving the overall appearance of the building, repairing the roof, facades and surroundings and carefully restoring the prestigious south facade. From a technical point of view, the building is solidly stabilised and energetically brought up to the latest standards. The project was developed with the involvement of the cantonal monument preservation authorities. Several meetings and inspections took place, on the basis of which the project was further developed in accordance with the requirements of the preservation of historical monuments.
Energieeffizienz
26,64 kWh/m2.y

Klimazone Cfb

Höhe über dem Meer 775 m ü.d.M.

Heizgradtage 171

Kühlgradtage 0

Unterschutzstellung denkmalgeschützt

Ensembleschutz:
Nein

Stufe der Unterschutzstellung:
Protected at cantonal level (Canton Bern)

Baualter 1700-1800

Letzte Sanierung:
1980

Vorhergehende Sanierungen:
1888

Gebäudenutzung Residential (rural)

zusätzliche Nutzung:
NA

Gebäudebelegung:
Permanently occupied

Anzahl der Bewohner/Nutzer:
4

Gebäudefläche Nettogeschossfläche [m²]: 985,0

Gebäudetyp:
Detached house

Anzahl der Stockwerke:
4

Keller ja/nein:
Ja

Anzahl der beheizten Stockwerke:
2

Bruttogeschossfläche [m²]:
1159,0

Thermische Gebäudehülle [m²]:
910,0

Volumen [m³]:
1880,0

NGF Berechnungsmethode:
SIA 416

Bauart
Timber frame

Außen:
Exposed woodwork

Innen:
Exposed woodwork

Dach:
Pitched roof

+ MEHR - WENIGER
View from south-west © C. Martig
View from south-west © C. Martig
Top view from south-east © C. Heilig
Top view from south-east © C. Heilig
South slope © C. Heilig
South slope © C. Heilig
Night view © C. Anliker
Night view © C. Anliker
Environment © C. Anliker
Environment © C. Anliker
General view before interventions © C. Anliker
General view before interventions © C. Anliker
East view before interventions © C. Anliker
East view before interventions © C. Anliker
South front  before interventions © C. Anliker
South front before interventions © C. Anliker
South front  before interventions © C. Anliker
South front before interventions © C. Anliker

RENOVIERUNGS-PROZESS

Architektur

BESCHREIBUNG

The building in Affoltern in the Emmental/BE is an imposing glazier's house built in 1765. A first renovation took place in 1888. The last renovation, which was completed in 2015, is a shining example of how, despite extensive preservation orders, the total energy requirement can be low and solar power generation high. The building with a very compact volume, is located in an open country area, in the middle of cultivated fields not far from the centre of the village Affoltern in Emmental. It is completely free and has a very good exposure. The original structure consists in quarry stone foundations and a stand/beam construction. The original woodwork facades were shingle-covered during the 1888 renovation, as shown in pre-intervention photos. For the 2015 renovation the decision is to remove the shingle cladding to make the stud construction visible again where possible and keep it in its original grey tone. The iconic south façade, which consists in a traditional window front, has a particular value in terms of monument conservation.
Städtebaulicher Kontext
Isolated building in a rural setting.

DENKMALWERT

ERHALTENSWERTE ELEMENTE
The 250 years old house is, as the name “Glaserhaus” (glazier house) explain itself, important for her iconic south front, which appears with a multitude of windows. The three-storeys house is crowned by a roundabout. The eaves-sided upper floor arcades are closed. The house shows also contoured woods (braided bows) and a distinguished grey frame. Unfortunately, the general state of the building was near to collapse, imposing a big intervention. The shape and the volume of the building have primary relevance on the conservation of this historic house, together with the south front. A massive part of the structure was no longer safe, including the roof. It has been renovated following the original quarter hipped shape.
Denkmalwert und wie er bestimmt wurde
The new roof presents a recognizable photovoltaic system that perfectly follows the original shape of the roof. We start from the fact that the original roof structure was in a very decadent state. During their life buildings follow the development of building techniques, taking the best of each of the previous eras. History changes from thatched roofs, to shingle roofs, to flat tiles. As a logical consequence in a building subject to environmental protection and taken as a symbol to maximize energy efficiency on historic buildings, an integrated PV system is the best technology on the market. A question arises spontaneously: why so much effort to restore the south façade to its original state instead? The house has an important relevance in terms of individuals, due to the fact that it belonged to a well-known dynasty of glaziers and carpenters (Heiniger). This reasonably makes the windows front symbolic, deserving a special treatment. Some roof openings were added to reach a recommended light supply, since the existing openings where not enough.
Dateien zur Bewertung

Erhaltungszustand

Erhaltungszustand der Gebäudehülle
The building stood empty for a long time in the 20th century and began to deteriorate. The current owners found the house, which was classified as the highest level of protection by the canton of Bern's monument preservation department, in a desolate condition: the roof was leaky and the entire frame construction from the ground floor to the roof was badly warped. The existing building is marked by subsidence: the pier construction is warped into the roof construction due to insufficient load-bearing capacity and strength of the peripheral quarry stone foundations on the ground floor. The core building from 1765 comprises on the ground floor in front of the sandstone wall on the slope side the kitchen, the vaulted cellar with the stone staircase as well as the entrance and 2 rooms; it has only a limited foundation. Due to the pressure of the slope, the vaulted cellar has cracks; the lintel has cracked. The condition of the foundation of the building requires renovation. The most important measure is to install a continuous transverse stabilisation in the rear area of the quarry stone wall on the slope side. In order to enable the relevant concrete work to be carried out in the ground under the existing building, the transverse stabilisation requires appropriate excavation.
Haustechnische Anlagen vor Sanierung
Services were in a poor state and no longer usable. The transverse stabilization in the ground floor is to be designed as a hollow concrete body with inherent stability and then used as a technical room for the entire building. This will ensure that the cross-stabilization has the desired effect from a structural point of view and that the building services installations can be combined outside the original floor plan.

Ziel der Sanierung

Renovation
Since its construction, the building has always been inhabited but has never had a direct link with the cultivated fields around it. In 2012 the new owners had to intervene both to improve energy efficiency and to improve the statics with the aim to restore the house to its original appearance. The most important measure was the structural and constructive overhaul of the house. The project was developed with the involvement of the cantonal monument preservation authorities. Several meetings and inspections took place, on the basis of which the project was further developed in accordance with the requirements of the preservation of historical monuments. Finally the building application documents, which were very detailed in terms of monument protection by the architectural firm, were analysed by the competent cantonal office "Denkmalplege", which did not make any observations and allowed the building to be constructed as planned.
Gewonnen Erkenntnisse / besondere Erfahrungen
The project was approached with extreme seriousness and informal contacts with the competent authorities, so that all the prerequisites were in place to deal with a project of this magnitude and no particular problems were encountered during its execution.
Beteiligte Akteure
Öffentliche Hand
Denkmalpflege (Monument preservation office) Canton Bern
Schwarztorstrasse 31, 3001 Bern
denkmalpflege@be.ch
Tel.+41316334030
Architekt
Anliker Christian, Arch/Innenarchitekt SWB
Gerechtigkeitsgasse 73, 3011 Bern
ch.anliker@bluewin.ch
Tel.+41 31 311 49 06
Berater Denkmalpflege
Anliker Christian, Arch/Innenarchitekt SWB
Gerechtigkeitsgasse 73, 3011 Bern
ch.anliker@bluewin.ch
Tel.+41 31 311 49 06
Energieberater
Lukas Meister, clevergie gmbh, Region Bern
Gemeindehaus 118, 4954 Wyssachen
info@clevergie.ch
Tel.+41 62 966 00 66
Haustechniker
Lukas Meister, clevergie gmbh, Region Bern
Gemeindehaus 118, 4954 Wyssachen
info@clevergie.ch
Tel.+41 62 966 00 66
Andere
Habisreutinger Gebäudehülle GmbH
Brückenstrasse 6a, 4950 Huttwil
info@h-g.ch
Tel.+41 62 962 440
Eingesetzte Software/Berechnungstools
Folgte die Sanierung einer spezifischen Methode? Minergie P refurbishment but without certification
Energiebilanz SIA 380/1
Hygrothermische Bewertung No
Life Cycle Analysis (LCA) No
Anderes No

SANIERUNGS-LÖSUNGEN

Außenwände

Timber wall

Timber wall

Facades have been restored to their very first appearance. The state right before the intervention presents a shingle cladding which has been added in a later intervention during the 250 years long life of this building. For this reason, the renovation shows a wood cladding that replicates the original one and that will turn grey in a few years, giving back to the house her old charm. Some parts, visible on the south facade, are actually original. The building was in a very decadent state before renovation. For this reason, the structure has been largely renovated, whereas all the internal cladding consists in original reused wood.

As far as the energetic improvement is concerned, only the southern front was not thermally insulated due to protection constraints of historic buildings, that in this case were severe regarding the maintaining of the window front as close as the original as possible (the intervention was possible directly on windows, as described in the dedicated part of this article). Other facades improved with the insertion of the solar thermal insulation between the wooden rafters, reaching the Minergie-P standard.

U-Wert (vor Sanierung) [W/m2K]: 3,0 W/m²K U-Wert (nach Sanierung) [W/m2K]: 0,16 W/m²K
Mehr Details
Aufbau Bestandswand
Wood - solid wood planks:
40 mm
Wood - Girders and mullions:
200 mm
Aufbau sanierte Wand
Wood - Planks:
20mm
Other - Ventilation and battens:
70 mm
Wood - Softwood fibreboard:
40 mm
Insulation - Wood Wool and beams:
160 mm
Wood - USB:
20 mm
Insulation - Wood Wool and battens:
40 mm
Wood - Planks:
25 mm


Fenster

Wood windows

Wood windows

Replica windows with the same characteristics and dimensions as the previous ones were made, but which could accommodate a triple glazing (reproduction of the frame and crossbar profiles). For reasons of monument protection, the traditional window front with wooden bars remained without insulation. Only the other windows received new insulating glazing. The hand-made window panes installed by the master glazier in the 18th century found a new use in the interior.

Most of the windows are located on the large south front and due to protection constraints their appearance could not be changed: for this reason replica windows with the same characteristics and dimensions as the previous ones were made, but which could accommodate a triple glazing (reproduction of the frame and crossbar profiles).

Bestandsfenster U-Wert Glas [W/m2K]: 3,0 Neues Fenster U-Wert Glas [W/m2K]: 0,7 Bestandsfenster U-Wert Rahmen [W/m2K]: 3,0 Neues Fenster U-Wert Rahmen [W/m2K]: 1,0
Mehr Details
Fenstertyp Bestand Casement window
Verglasungsart Bestand Single
Verschattung Bestand NA
Ungefähres Einbaujahr 1888
Neuer Fenstertyp Casement window
Verglasungsart des neuen Fensters Triple
Verschattung des neuen Fensters NA
Neuer Energiedurchlassgrad g [-] 45,0

Weitere Maßnahmen

DACH

ERDGESCHOSS

DACH

The roof construction shows deformations caused by subsidence, in some places it is defective. The deformations are straightened, the defectiveness is remedied, especially by straightening the existing purlins and rafters. The existing roof structure is supplemented by a new rafter layer and wooden formwork to ensure the load-bearing capacity and rigidity of the entire system and to achieve the required insulation thickness. The roof is insulated throughout, which is indispensable in the cross-section to avoid energy inefficiency and to avoid areas of potential cold bridges. In addition, the existing storage use of the platform above the core building does not require any heating for energy reasons, but nevertheless a certain constancy with regard to room temperature and air humidity.

The roof shape is returned to its original simple form by removing the 20th century skylight and the roof elevation above the entrance to the storage room. The roof consists in a matt black slate-like photovoltaic system.

U-Wert (vor Sanierung) [W/m2K] 3 U-Wert (nach Sanierung) [W/m2K] 0.16
Mehr Details
Aufbau Bestandsdach
Tiles - Flat tiles:
15 mm
Other - Wood batten and counter-battening:
80 mm
Other - Beans:
200 mm
Aufbau saniertes Dach
Other - PV integrated system:
20 mm
Other - Wood batten and counter-battening:
110 mm
Other - Underroof / three-layer board (wood):
42 mm
Other - Insulation:
180 mm
Other - Wood board:
27 mm
Other - Wood beams:
180 mm
ERDGESCHOSS

Without thermal insulation and without sound insulation, board cladding of approx. 40 mm, partly on the ground and partly on wooden beams. Totally renovated.

The details were discussed with the cantonal office taking into account the height problems of the premises.

U-Wert (vor Sanierung) [W/m2K] 1 U-Wert (nach Sanierung) [W/m2K] 0.16
Mehr Details
Aufbau Boden/Kellerdecke im Bestand
Other - Earth:
400 mm
Finish - Wood:
40 mm
Aufbau Boden/Kellerdecke nach Sanierung
Insulation - XPS:
150 mm
Concrete slab - Concrete slab:
200 mm
Insulation - floor sound insulation:
30 mm
Finish - Floor:
30 mm

HVAC

HEIZUNG

LÜFTUNG

KLIMATISIERUNG

BRAUCHWARMWASSER

HEIZUNG

The heat is generated using two geothermal boreholes made of polyethylene pipes which are laid in the ground with a deep bore hole. The heat for the heating system is generated with a water heat pump. The hot water preparation is carried out by a 1'000l combi storage system. The heat pump, the heating group, the free-cooling function and the DHW preparation are regulated or controlled by the projected regulation. The heat load occurring in summer is extracted from the building with the floor heating pipes and released into the ground via the geothermal probe. For room heating in winter and cooling in summer, a separately controllable and shut-off underfloor heating group is provided on the ground floor, 1st floor and first floor. The heat is emitted or extracted with a conventional underfloor heating system, inserted in the underlay floor. The individual room regulation is ensured by electric room sensors. Rooms with minimum room heights are heated with radiators, the wet areas are additionally heated with a towel radiator. The heat distribution takes place via a radiator heating group which can be separately regulated and switched off from the heat generator or storage tank. A Step oven under preservation order, with built-in heating register is also operated via the radiator heating group. The individual room regulation is ensured by thermostatic valves.

The only element of the heating system that touches on the protection of historical monuments is the step oven on the ground floor, whose model was chosen according to the requirements of historical monuments. An existing traditional tiled stove with a heated bench - a so-called Swiss step stove - was incorporated into the heating circuit via a subsequently installed heating register.

Mehr Details
Heizungssystem nach Sanierung zusätzliches Heizungssystem nach Sanierung
Art der Heizung Heat pump Stove
Brennstoff Electricity Biomass
Wärmeverteilung Radiating floor Air
Nennleistung 17 kW NA kW
LÜFTUNG

The building has ventilation with opening of windows, no mechanical ventilation

The airtightness of the windows has been largely improved while maintaining the appearance in accordance with the historical monuments.

Mehr Details
Aufbau Bestandsdach Neues Lüftungssystem
Lüftungstyp NA (Natural)
Type flow regime NA (Natural)
Wärmerückgewinnung Nein
Feuchterückgewinnung Nein
Nennleistung 0 kW
Elektrische Leistung 0,0 kW
Regelung No
KLIMATISIERUNG

The heat load occurring in summer is extracted from the building with the floor heating pipes and released into the ground via the geothermal probe. In summer, the building can also be passively cooled with the system. The water circulating in the underfloor heating absorbs excess heat and transfers it via a heat exchanger to the brine circuit and then to the ground.

The cooling system is integrated in the heating distribution (radiating floor) and doesn’t involve any intervention that requires conservation compatibility.

Mehr Details
New cooling system
Type Heat pump
Distribuition system Radiating floor
Nominal power 13.4 kW
Electric power 3,62 kW
BRAUCHWARMWASSER

The heat is generated using two geothermal boreholes made of polyethylene pipes which are laid in the ground with a deep bore hole. The heat for the heating system is generated with a water heat pump. The hot water preparation is carried out by a 1'000l combi storage system.

The DHWsystem is integrated in the heating that doesn’t involve any intervention that requires conservation compatibility. An existing traditional tiled stove with a heated bench - a so-called Swiss step stove - was incorporated into the heating circuit via a subsequently installed heating register.

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

ERNEUERBARE ENERGIE

Photovoltaik

Geothermie

Photovoltaik

This intervention demonstrates the potential PV implementation in a protected building and within a sensible landscaping heritage. The solar tiling completely replace the roof surface. The homogeneous solar cladding, extended to the whole roof area, creates a clear recognizability/expression of PV respecting the general lines and the morphology of the pre-existing building typology. Twelve skylights that can be opened are integrated into the solar roof to increase daylighting inside the building and to allow natural ventilation. The project was awarded with the swiss solar price 2016.

On the roof of the special craftsmen's house, which is a listed building, a fully integrated photovoltaic system was installed. The modules take over the function of the water-bearing layer, therefore it is an in-roof system.

The frameless modules of the Swiss company Meyer Burger were used. In order to be able to actively cover the edges of the roof, so-called "Crea modules" from Meyer Burger (made to measure) were also added. In order to maintain a homogenous black appearance of the roof surface, solar-look printed single-pane safety glass was used on the northern mitre sign.

Mehr Details
Photovoltaic System
Type Monocrystaline
Collector area 550,0 m²
Total nominal power 85,0 kW
Elevation angle 45,0
Azimuth 85,0
Overall yearly production 90493,0 kWh
Heating contribuition 12300,0 kW
DHW contribuition 0,0 kW
Cooling contribuition 0,0 kW
Lighting contribuition 13940,0 kW
Geothermie

Two geothermal probes placed at a depth of 180 meters extract heat from the ground, which is raised by the heat pump to a temperature level suitable for space heating and hot water preparation. In summer, the building can also be passively cooled with the system. The heat is generated using two geothermal boreholes made of polyethylene pipes which are laid in the ground with a deep bore hole. The heat for the heating system is generated with a water heat pump. The hot water preparation is carried out by a 1'000l combi storage system. The heat pump, the heating group, the free-cooling function and the DHW preparation are regulated or controlled by the projected regulation.

The only element of the heating system that touches on the protection of historical monuments is the step oven on the ground floor, whose model was chosen according to the requirements of historical monuments.

The heat is emitted or extracted with a conventional floor heating system, inserted in the underlay floor. The individual room regulation is ensured by electric room sensors. Rooms with minimum room heights are heated with radiators, the wet areas are additionally heated with a towel radiator.

Mehr Details
Geothermal System
Type Vertical loop
Exchange area 696,0 m²
Overall yearly production 26000,0 kWh

Energieeffizienz

Energieeffizienz
Energieausweis Nein
Freiwillige Zertifikate The owners renovated the building strictly in accordance with the Minergie-P standard (but without an official label). This construction standard corresponds to Passivhaus in DE or CasaClima Gold in Italy. Spread over all sides of the roof, the 89.4 kW and 550 m2 PV installation produces 90,500 kWh/y. Until the full completion of the semi-detached dwelling, only two people live and work in the building, which explains the effective surplus of 80'800 kWh/y injectable into the public grid. The high quality of PEB (Plus Energy Building) renovation ensures 345% self-production.
Energievrabrauch
Heizung
Berechnungsmethode On-stie monitoring
Documents:
20160414_scs_Verbrauch Wärmepumpe 2015.pdf
Consumption heating
20160414_scs_Verbrauch Wohnung EG DG 2015.pdf
Consumption electricity

Energieverbrauch vor Sanierung 180000 kWh/y
Energieverbrauch nach Sanierung 26,64 kWh/m2.y

Primärenergie
Berechnungsmethode Steady state simulation (e.g. EPC, PHPP)
Documents:
Dati energetici Affoltern.pdf
Energetic data

Energieverbrauch incl Brauchwarmwasser Ja
Energieverbrauch vor Sanierung 273100 kWh/y
Energieverbrauch nach Sanierung 77932 kWh/y
Gemessene Parameter
Raumklima
Type_of_monitoring: Punctual
Description: The building before the renovation was not at all airtight, considering the gaps between the wooden boards that make up the previous shell. The realisation of the new shell in accordance with the SIA 180 standard, which requires airtightness, improves radically the quality of internal climate. The heating system is reversible and permits to cool the inside spaces during the hot summers.

Bauteile
Type_of_monitoring: Continuous
Description: No construction or indoor air quality monitoring is performed. For the temperature there are modern systems with sensors (hot-cold). Monitoring of performances of PV systems and energy improvements are available at: https://www.energie-cluster.ch/de/deklariert-ch/plusenergiegebaeude/efh-anliker-sanierung-eggerdingen-7-3416-affoltern-im-emmental-3495.html

Raumklima

Temperatur

The building is divided in two different heating zones: the normal one in the core and the rest. The existing storage use of the platform above the core building does not require any heating for energy reasons, but nevertheless a certain constancy with regard to room temperature and air humidity.

Indoor Air Quality

The building before the renovation was not at all airtight, considering the gaps between the wooden boards that make up the previous shell. The realisation of the new shell in accordance with the SIA 180 standard, which requires airtightness, improves radically the quality of internal climate. The heating system is reversible and permits to cool the inside spaces during the hot summers. For the temperature there are modern systems with sensors (hot-cold). Twelve skylights that can be opened are integrated into the solar roof to allow natural ventilation and to increase daylighting inside the building.

Daylight

The lighting in the building is largely provided by natural light, thanks to the arrangement of the windows, especially those on the south front, where the fully inhabited and heated part of the building is located, which bring plenty of light inside. In the semi-heated/unheated areas of the roof level, the skylights integrated in the photovoltaic roofing bring the necessary light without having to use electricity during the day.

akustischer Komfort

The sound insulation has been significantly improved compared to the previous situation, with a minimum of impact insulation but within certain limits due to the local height.

Erhaltung von Ausstellungsstücken

The wooden planks, used for the previous casing, were cut from whole trees and had widths of up to 84 cm (tree trunk). These were replaced and some of them with paintings, 1m x 50 cm, were given to the Landesmuseum.

Kosten

Finanzielle Aspekte

The goal of the refurbishment was to re-use these building that was in a really bad estate. Costs includes all the action to do this.

Investitionskosten
Total investment costs
2.8 mio CHF (total)
Amount includes: Building and surroundings

Cost of energy related interventions:
745'000.- CHF (total)
Amount includes: Insulation floor, walls, roof, windows, PV, heat pump and borholes
Betriebskosten
Total annual energy cost
180.- per month (about 2160 CHF/year) (total)

Annual heating cost
about 1500.- CHF (total)
(includes DHW) Ja

Annual electricity cost
about 660.- CHF (total)

Lifecycle cost
Nein

Umwelt

Water Management

A cistern has been built that takes both rainwater and water from a small spring in the ground (used approx. 8l/min). An overflow brings the excess water to a nearby stream.

Transport and Mobility

It is planned to build a charging station for electric cars, at the moment that the owners will change vehicles (private car as they live in the countryside). There is a place to lay batteries but they are not yet laid. The batteries would be used to store electricity both for domestic use and for the electric car.

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