atlas@eurac.edu
ALLGEMEINE INFORMATIONEN RENOVIERUNGS-PROZESS SANIERUNGS-LÖSUNGEN BEWERTUNG

Half-timberframed house in Alken, Belgium

Ridderstraat 10

B-3570

Alken, Belgien

Architekt

Liliane Vandeput
Minderbroederstraat 52/3, 3500 Hasselt

Besitzer

Tom en Katrien Govaerts-Maes
Ridderstraat 10 – B 3570 Alken

Bewohner

idem

Ansprechpartner

Nathalie Vernimme
Flanders Heritage Agency
nathalie.vernimme@vlaanderen.be
0032475814291

Other Information

The data were collected from the architect with permission of the owner in the context of a research project initiated by the Flanders Heritage Agency on the energy efficiency of heritage buildings used for housing. The research was conducted by ANTEA The research results are published in Dutch: Verdonck P., Beel R., Vermeiren E. & Grieten B. 2017: Energiezuinige maatregelen in monumenten met woonfunctie, Onderzoeksrapporten agentschap Onroerend Erfgoed 70/1 ISSN 1371-4678 and online available: https://oar.onroerenderfgoed.be item/450

Related publications
Verdonck P., Beel R., Vermeiren E. & Grieten B. 2017: Energiezuinige maatregelen in monumenten met woonfunctie, Onderzoeksrapporten agentschap Onroerend Erfgoed 70/1 ISSN 1371-4678 and online available: https://oar.onroerenderfgoed.be item/450.
Half timber framed, rendered vernacular detached building with late 17th century core, expanded on both sides in the 19th century. The building was out of use and in a very bad state at the moment of renovation. The purpose of the total building renovation (including improvement of energy performance and comfort) was residential reuse. The building renovation comprehended renovation of the roof, the external walls and windows, floor insulation as well as some other interventions such as introduction of a new condensing gas wall boiler, underfloor heating for the ground floor and radiators for the first floor.
ALLGEMEINE INFORMATIONEN RENOVIERUNGS-PROZESS SANIERUNGS-LÖSUNGEN BEWERTUNG
Energieeffizienz
no data available

Klimazone Climate zone CfB

Höhe über dem Meer 38 m ü.d.M.

Heizgradtage 2033

Kühlgradtage 59

Unterschutzstellung denkmalgeschützt

Ensembleschutz:
Nein

Stufe der Unterschutzstellung:
protected monument

Baualter 1600-1700

Letzte Sanierung:
2016

Vorhergehende Sanierungen:
0

Gebäudenutzung Residential (rural)

zusätzliche Nutzung:
NA

Gebäudebelegung:
Permanently occupied

Anzahl der Bewohner/Nutzer:
4

Gebäudefläche Nettogeschossfläche [m²]: 288,13

Gebäudetyp:
Detached house

Anzahl der Stockwerke:
2

Keller ja/nein:
Ja

Anzahl der beheizten Stockwerke:
2

Bruttogeschossfläche [m²]:
329,9

Thermische Gebäudehülle [m²]:
1002,89

Volumen [m³]:
1241,0

NGF Berechnungsmethode:
Useful area (BE)

Bauart
Timber frame

Außen:
Rendered

Innen:
timberframe/ rendered - plastered on substructure

Dach:
Pitched roof

+ MEHR - WENIGER

RENOVIERUNGS-PROZESS

Architektur

BESCHREIBUNG

Half timber framed, rendered vernacular detached building with late 17th century core, expanded on both sides in the 19th century. The type of architecture is a double house with an increased ground floor. It consists of 8 bays and one building layer. The building is situated in Alken in the province of Limburg (Flanders). The structure of the building, the various construction traces in situ and the cadastral investigation showed that the half-timbered house probably did not have an agricultural function, and was not part of a larger agricultural entity. The building knew on the contrary a trade and/or craft function in combination with a residence. According to the cadastral research, the owners were successively an innkeeper, a baker and a miller. In 1888 there was a conversion of the half-timbered house to a private school with a residence. The half-timbered construction was once typical and characteristic for the entire building territory of Alken.
Städtebaulicher Kontext
Alken is a small village with 11.500 inhabitants situated in the Fruitregion Haspengouw in the province of Limburg in Flanders, Belgium. The village was first mentioned in documents in 1066. In developed in the valley of the river Herk. The half-timbered house, is situated in the village centre. The house has today largely retained its semi-isolated character.

Erhaltungszustand

Erhaltungszustand der Gebäudehülle
From a physical point of view, the building was in a very poor condition and almost completely stripped down to the bearing structure. Some valuable interior elements such as wooden doors, floortiles and remains of 17th century joinery were still in place.
Haustechnische Anlagen vor Sanierung
The half-timbered house had virtually no modern technical equipment, with the exception of some under construction placed electrical lines. Heating was done with fireplaces, idem for the production of hot water.

DENKMALWERT

ERHALTENSWERTE ELEMENTE
From a heritage point of view some elements were considererd worhty of preservation : -The lattice and roof structure. -Visualization of the 17th and 19th century cores. -Use of artisanal techniques and materials of the same kind and dimensions. -The remnants and traces of the 17th-century joinery. -The wooden style and lattice work of the inner walls -Reuse of the floor tiles if possible.
Denkmalwert und wie er bestimmt wurde
The building is one of the only 3 remaining half timberframed houses in the towncentre of Alken. It has an important historical and architectural value. It appeared in old maps such as the Ferrariskaart (1771 – 1777), and the Buurtwegenatlas (ca. 1840). Originally it was situated in the more rural fringes of the village. Up til today it hes kept this semi isolated position. The building also has a socio-cultural value as the half timbered building represents a local vernacular building tradition with its own esthetical and visual qualities. The house was protected as monument on november 4th 2002.

Ziel der Sanierung

Renovation + Extension
The building was out of use and in a very bad state at the moment of renovation. The purpose of the total building renovation (including improvement of energy performance and comfort) was residential reuse. The passage on the left of the building was retained. A kitchen was built on the rear façade. This new building volume is modern and can be visually distinguished from the original building. The building renovation comprehended renovation of the roof, the external walls and windows, floor insulation as well as some other interventions such as introduction of a new condensing gas wall boiler, underfloor heating for the ground floor and radiators for the first floor. There is added a Ventilation system D balanced ventilation with heat recovery
Gab es eine Änderung der Nutzung?
Originally the building had a craft/trade function combined with residence. It was later converted to a private school with residence. The residence function is retained. After the renovation, the two floors would be in use. Previously, the attic was not inhabited - it was empty.
Was the intervention planned following a step-by-step approach?
The interventions were supervised by the heritage authorities and followed the approach as set in the regional legislation. All interventions were discussed with the heritage consultant and implemented in the conservation-restoration file.
Gewonnen Erkenntnisse / besondere Erfahrungen
It is not evident to test a methodology with private owners. Most of them have already a very precise idea of what interventions they want and what their priorities are. Heritage values is not always number one on the list. The budget is also a key indicator in how and what choses are taken.
Beteiligte Akteure
Öffentliche Hand
Flanders Heritage Agency
Koningin Astridlaan 50 bus 1, 3500 Hasselt
info@onroerenderfgoed.be
Forschung und Entwicklung
Antea Belgium nv
Roderveldlaan 1 2600 Berchem (Antwerpen)
Architekt
Liliane Vandeput
Minderbroederstraat 52/3, 3500 Hasselt
Berater Denkmalpflege
Erfgoed & Visie
Lierselei 84 B -B 2390 Malle
architecten@erfgoed-en-visie.be
Energieberater
Stiev Schockaert
Achterstraat 6b, B-9550 Herzele
info@igenia.be
Eingesetzte Software/Berechnungstools
Folgte die Sanierung einer spezifischen Methode? the research project tested a methodology for the implementation of energysaving interventions in heritage buildings similar to (but less complex than) the methodology of EN 16883.
Energiebilanz EPB-software v8.0.4
Hygrothermische Bewertung Blowerdoor (after renovation)
Life Cycle Analysis (LCA) A life cycle analysis was not carried out but the renovation was done with respect for local grown materials.

SANIERUNGS-LÖSUNGEN

Außenwände

outer wall made of wooden framework filled with loam and brickwork, rendered with loam

outer wall made of wooden framework filled with loam and brickwork, rendered with loam

For energetic reasons, the loam and brickwork of the outer walls has been replaced by a combination of a framework and mineral wool insulation and wood wool fiber boards. The exterior finish of clay plaster was retained as it has heritage value. A pipe pillar was provided on the inside.

The visual perception of the wall has not altered. The modifications made to the wall (insulation on the inner side of te wall) in function of energy-efficiency were approved by the conservation authority.

U-Wert (vor Sanierung) [W/m2K]: 1,93 W/m²K U-Wert (nach Sanierung) [W/m2K]: 0,29 W/m²K
Mehr Details
Aufbau Bestandswand
Render - Outermost finishing loam :
 30 mm
Other - filling of framework structure: loam + wooden fence (oak):
 120 mm
Plaster - innermost : plastered:
 30 mm
Aufbau sanierte Wand
Render - Outermost finishing loam:
 20mm
Insulation - framework+ fiberboardinsulation 40mm+60 mm:
 100 mm
Other - framework + rock wool insulation 63mm+60mm:
 123 mm
Wood panelling - OSB 18mm+ frameworkelements 43mm+plasterboard 2X12,5mm:
 86 mm


Fenster

casement window

casement window

The windows were in a very bad state. There were windowremains from the 17th, 19th en even 20th century. At some places the windows were absent. The remaining wooden joinery in the half-timbered house has been completely replaced by typologically appropriate - to existing model-, new joinery. The new windows have double glazing (adjustment of the profile thickness).

Substitution of all windows to existing 17th century model with insertion of double glazing (U=1,1W/m2K).

Bestandsfenster U-Wert Glas [W/m2K]: 5,7 Neues Fenster U-Wert Glas [W/m2K]: 1,1 Bestandsfenster U-Wert Rahmen [W/m2K]: 2,36 Neues Fenster U-Wert Rahmen [W/m2K]: 1,66
Mehr Details
Fenstertyp Bestand Casement window
Verglasungsart Bestand Single
Verschattung Bestand NA
Neuer Fenstertyp Casement window
Verglasungsart des neuen Fensters Double
Verschattung des neuen Fensters NA

Weitere Maßnahmen

DACH

ERDGESCHOSS

SONSTIGES

MASSNAHMEN UM DIE LUFTDICHTIGKEIT ZU VERBESSERN

DACH

The original construction was almost completely preserved. The roof, a saddle roof with wolf end, was covered with a temporary roof construction at the time of renovation. This was placed to protect the building against further water seepage and consequential damage, awaiting the final restoration works. Because of its original character and architectural-historical value, the roofstructure preferably had to remain visible on the inside including the rafters, especially in the late 17th century core. Therefore it was preferable to insulate according to the sarking roof principle. To this end, a planking was placed on the rafters. In the 19th century section the insulation was placed between the rafters.

The visual perception of the roof has not altered. The modifications made to the roof in function of energy-efficiency were approved by the conservation authority.

U-Wert (vor Sanierung) [W/m2K] 5,07 U-Wert (nach Sanierung) [W/m2K] 0,26
Mehr Details
Aufbau Bestandsdach
Tiles - 'Boomse' Tiles:
 20 mm
Aufbau saniertes Dach
Tiles - type Pottelberg 451 vieilli:
 17 mm
Other - wood fibre insulation board:
 22 mm
Other - wood fibre insulation:
 120 mm
Other - Airgap- pipe pillar:
 22 mm
Other - plasterboard:
 1 mm
ERDGESCHOSS

Since all floors were disassembled or removed, the opportunity could be used to provide a new stable, waterproof and insulated floor structure. The floor was insulated in such a way that the current EPB requirements are met.

From the conservation point of view it was regretted that the floor tiles were not reused. They were not original and dated from 19th en even 20th century but they were typical for an earlier renovation.

U-Wert (vor Sanierung) [W/m2K] 0,76 U-Wert (nach Sanierung) [W/m2K] 0,3
Mehr Details
Aufbau Boden/Kellerdecke im Bestand
Other - Floor tiles:
 10 mm
Aufbau Boden/Kellerdecke nach Sanierung
Concrete slab - concrete slab- underfloor:
 200 mm
Other - filling layer:
 50 mm
Damp Proof Membrane - damp proof membrane:
 1 mm
Insulation - PUR:
 60 mm
Damp Proof Membrane - damp proof membrane:
 1 mm
Other - screed:
 70 mm
Other - floor tiles/ wood:
 20 mm
SONSTIGES

New doors/ insulation inner walls and floorinsulation (first floor)

The new doors have been executed according to current standards. the visual impact on the heritage values is acceptable. The floor insulation on the first floor and the insulation of the inner walls was approved by the heritage agency

MASSNAHMEN UM DIE LUFTDICHTIGKEIT ZU VERBESSERN

In the situation before renovation the building was leak. There were multiple openings in windows, roofs, walls.

Airtightness (pre-intervention) [ach@50Pa] 12,00 m³/hm² Airtightness (post-intervention) [ach@50Pa] n5019: 3,0 h-1 - v5020: 4,9 m³/hm²

HVAC

HEIZUNG

LÜFTUNG

BRAUCHWARMWASSER

HEIZUNG

Before the renovation there were only stoves for local heating. after the renovation the Ground floor is heated with underfloor heating and the First Floor is heated with radiators

There were no important interior wall elements that needed preservation. So the radiators where not a problem. But the floor tiles on the ground floor were not reused after the installation of the underfloor heating. They were replaced by a new floor.

Mehr Details
Heizungssystem nach Sanierung
Art der Heizung Condensing
Brennstoff Gas
Wärmeverteilung Radiating floor
Nennleistung (1.6 - 35 kW heating, 33.5 kW domestic hot water) kW
LÜFTUNG

Ventilation system D balanced ventilation with heat recovery

The installation of a ventilation system is obligatory in case of total renovation.

Mehr Details
Aufbau Bestandsdach Neues Lüftungssystem
Lüftungstyp Centralized
Type flow regime
Wärmerückgewinnung Ja
Feuchterückgewinnung Nein
Nennleistung kW
Elektrische Leistung kW
Regelung
BRAUCHWARMWASSER

33.5 kW domestic hot water

acceptable

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

Energieeffizienz

Energieeffizienz
Energieausweis E94
Freiwillige Zertifikate Nein
Energievrabrauch
Energieverbrauch vor Sanierung 103264 kWh/y

Primärenergie
Berechnungsmethode Steady state simulation (e.g. EPC, PHPP)
Documents:
results EPB .jpg
Energieverbrauch vor Sanierung 170358 kWh/y
Gemessene Parameter
Bauteile
Type_of_monitoring: Punctual

Raumklima

Temperatur

The building owner evaluates the temperature as comfortable.

Indoor Air Quality

The building owner evaluates the indoor air quality as pleasant.

Daylight

The building owner evaluatde the daylight supply as sufficient, even in winter.

akustischer Komfort

The building owner and guests evaluate the acoustic comfort as positive. The appartments towards the courtyard have better acoustic conditions, as they are turned away from the street