GENERAL INFORMATION RENOVATION PROCESS RETROFIT SOLUTIONS EVALUATION

Giatla house

Kalkstein 154

9932

Innervillgraten, Austriche

Architect

Arch. DI Reinhard Madritsch & Robert Pfurtscheller

Anton Rauch Straße 18*5, 6020 Innsbruck, AT

Owner

Dr. Martin Steinlechner

User

Benjamin Schaller

Kalkstein 152, 9932 Innervillgraten - Osttirol, AT

benjamin.schaller@alfenalm.at

Contact Details

Pavel Sevela

Universität Innsbruck - Arbeitsbereich Energieeffizientes Bauen

pavel.sevela@uibk.ac.at

+436603799585

Other Information

Visits
http://www.giatla.at/

Related publications
https://www.madritschpfurtscheller.at/projekte/projekt/giatla-apartmenthaus-in-einem-alten-bauernhaus-als-umnutzung/

The Giatla house, a 300-year-old farmhouse typical of the region, had been neglected and was in a very devastated condition. There were some indications that the house was sliding down the slope. A new use as a holiday apartment and a careful intervention has brought this building back to life.

GENERAL INFORMATION RENOVATION PROCESS RETROFIT SOLUTIONS EVALUATION

Energy performance

65,4 kWh/m2.y

Climate Zone Dfc

Altitude 1641

HDD 6029

CDD 185

Protection level Not listed

Conservation Area:
No

Level of Protection:
Kein offizieller Schutz, der Bauherr schützte das Gebäude selbst

Building age 1600-1700

Year of last renovation:
2015

Building use Hotel/Restaurant

Secondary use:
4 vacation apartments

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

Number of occupants/users:
12

Building area Net floor area [m²]: 236,0

Building typology:
Detached house

Number of floors:
3

Basement yes/no:
Oui

Number of heated floors:
3

Gross floor area [m²]:
0,0

Thermal envelope area [m²]:
629,0

Volume [m³]:
718,0

NFA calculation method:
NGF (de)

Construction type

Solid timber wall

External finish:
Exposed woodwork

Internal finish:
Exposed woodwork

Roof type:
Pitched roof

+ MORE - LESS

South fasade - Before the renovation, © Arch. DI Reinhard Madritsch

Floor plans, © Arch. DI Reinhard Madritsch

Documentation Giatla, UNI Innsbruck, Peter Knapp 1993

RENOVATION PROCESS

Architecture

BUILDING DESCRIPTION

The Giatla house, a 300-year-old farmhouse typical of the region, but empty, is situated in the hamlet of Kalkstein, about 4.5 km from the centre of Innervillgraten at an altitude of 1625 m.

Urban context

The farm is located in the middle of a group of 8 houses and was probably built in 1682. The year 1682 is found on the groundfloor on a door in the area of the old kitchen and was built over the entrance door during the renovation. A second date was found in the old ridge with 1865, the piece is now used in the loft/attic. The assumption is that the farm was originally built in 1682, then expanded in 1865, finally renovated in 2014/15.

Heritage Assessment Files

Bewertung des Wertes des Kulturerbes (Uni Innsbruck, Peter Knapp)

082-Giatler Umbau.pdf

Site plan and inventory plans

State of repair

Conditions of the envelope

The building was empty before the renovation and was in a very devastated condition, and there were indications that the house was moving down the slope.

Description of pre-intervention building services

In the house there was a tiled stove for heating and a cook stove for cooking. The house also had drinking water.

HERITAGE SIGNIFICANCE

ELEMENTS WORTHY OF PRESERVATION

The building proportions, the wooden roof with clapboards, original small windows with old uneven glass, the solid timber walls with dovetail notches, balconies, wheel with transmissions in the attic (used in the past to transfer the energy of the water from the stream to run machines in the building).

Heritage Value Assesment

The block construction corresponds to the type of the valley. However, there is a special feature that needs to be mentioned. At first sight of the house one assumes that both the cellar and the front part of the ground floor are bricked. But the ground floor is, except for a small part, timbered and only plastered on the outside. This is clearly visible at the east corner, where a part of the cellar masonry has collapsed inwards and a part of the block walls above has been exposed. Above the cellar there are 3 more floors rising above a total height of approx. 10 meters (ridge height). The ground floor only has the Söller on the front side, the upper floor on the south and the west side. On the east side a ramp leads from the street to the entrance in the common area. The original floor plan of this house also corresponds to the typical floor plan of the Villgrater house. In contrast to the Högger Hof, the Gietler Hof is a so-called 'simple house', with only a parlour and kitchen on either side of the Labe and a bedroom on the upper floor. However, the courtyard was extended to the east a few decades ago and today there is an additional chamber next to the parlour, or in the cellar and an additional room on the upper floor. On the north side of the house there were 2 granaries under the large eaves, which were also designed in block construction. These were built by the owners some years ago worn. Also the ceilings and some partition walls in the living part of the house were torn down.

Aim of retrofit

Renovation

The entire building is supported, strengthened and stabilized by means of strip foundation slabs. In the area of the cellar, two rooms are used in succession as a workshop and (wine) cellar. On the ground floor and upper floor, four vacation apartments with four bathrooms were built while retaining the existing (wooden) structure. The former arcade will remain original. At the same time, the house in the area of the north-west corner receives another new staircase, which serves the entire new development. Furthermore, a sauna with a fresh air room will be built in the attic above the area of the arcade, accessible via the new staircase. (Madritsch)

Was there any change of use?

The farmhouse was converted into an apartment house with 12 beds.

Lessons learned

The project began around the idea of a "house within a house" and thanks to the architect's great commitment and precise planning, the ideas soon began to appear realistic. It was crucial to work closely with local craftsmen and to be on site to take care of the details of the execution.

Stakeholders Involvement

Private Sector
Andreas Gardener
Außervillgraten 204, 9931 Außervillgraten, AT

Architect
Arch. DI Reinhard Madritsch & Robert Pfurtscheller
Anton Rauch Straße 18*5, 6020 Innsbruck, AT

Energy Consultant
Reinhard Hutter
Hauptplatz 1, 9754 Steinfeld, AT

Tools used

Was the renovation process done following a specific methodology? No

Energy calculation Energieausweis / Energy Performance Certificate (Zehentmayer Software GmbH)
Hygrothermal assessment no
Life Cycle Analysis (LCA) Die Materialien und die Art und Weise des Bauens waren meist traditionell mit dem Prosepkt einer sehr langen Lebensdauer. / The materials and the way of building were mostly traditional with the prospect of a very long life.
Other 3D Design in Rhinoceros

RETROFIT SOLUTIONS

External Walls

Log construction

Log construction in the log construction with interim insulation

The old façade was preserved as far as possible. Inside, a new eight-centimetre thick wall structure has been created, which blends into the old walls or wooden walls like a new block. Between the old and the new building the insulation and vapur barier was inserted, whereby local sheep insulation was used as a natural building material". (Benjamin Schaller)

Application of the internal insulation, ©Benjamin Schaller

Interior view of the second log construction, ©Benjamin Schaller

Interior view to the internal insulation, ©Benjamin Schaller

Log construction from inside, © Arch. DI Reinhard Madritsch

Log construction with damaged plaster layer, ©Arch. DI Reinhard Madritsch

Horizontal section, ©Arch. DI Reinhard Madritsch

U-value (post-intervention) [W/m2K]: 0,35 W/m²K

More Details

Original wall build-up

Wood - Holzblockwand:
120 mm

:
0 mm

Retrofitted wall build-up

Wood - Holzblockwand:
120mm

Other - ISOCELL OMEGA Fassadenbahn:
0 mm

Insulation - Lattung dazwischen Schafwolle-Dämmfilz (30 kg/m³):
60 mm

Other - Dampfbremse:
0 mm

Wood - Massivholzplatten (3-Schicht, 5-Schicht) 475 kg/m³:
80 mm

Windows

Single glazed windows

New Larch-windows behind the historical windows

The new highly thermally insulating window was placed behind the historic window in the thermal insulation layer from the inside.

View to the new and old windows from the inside, ©Benjamin Schaller

Detailed view to the new and old windows from the inside, ©Benjamin Schaller

Detailed view to the new and old windows from the inside, ©Pavel Sevela

Vertical section of the window, © Arch. DI Reinhard Madritsch

Existing window U-value Glass [W/m2K]: 2,2 New window U-value Glass[W/m2K]: 0,6 Existing window U-value Frame [W/m2K]: 5,0 New window U-value Frame [W/m2K]: 1,55

More Details

Existing window type	Casement window
Existing glazing type	Single
Existing shading type	NA
Approximate installation year	1930

New window type	Casement window
New glazing type	Triple
New shading type	NA
New window solar factor g [-]	0,5

Other interventions

ROOF

GROUND FLOOR

MEASURES TO INCREASE AIRTIGHTNESS

ROOF

The shingle roof including the rafters and the round timber battens were replaced in the traditional way. The roof was also thermally insulated in places where there is a heated area underneath.

The roof was built strictly in the traditional way. Bringing the thermal insulation into the roof is less problematic compared to the wall constructions.

Roof with the new rafters, ©Benjamin Schaller

View from below the new roof onto the round battens, ©Benjamin Schaller

Installation of the shingles in the new battens, ©Benjamin Schaller

View on the finished shingle roof, ©Benjamin Schaller

View from below on the finished shingle roof without insulation, ©Benjamin Schaller

Dismantling of the original shingle roof, ©Benjamin Schaller

View from below the original roof onto the round battens, ©Benjamin Schaller

Cross section of the insulated roof over the sauna, © Arch. DI Reinhard Madritsch

U-value (pre-intervention) [W/m2K] 2,8 U-value (post-intervention) [W/m2K] 0,11

More Details

Original roof build-up

Shingles - Schindeleindeckung 3-lagig:
100 mm

Other - Unterkonstruktion - Lattung:
30 mm

Other - Hinterlüftung - Kontralattung:
30 mm

Other - Sparren:
200 mm

Retrofitted roof build-up

Shingles - Schindeleindeckung 3-lagig:
100 mm

Other - Unterkonstruktion - Lattung:
30 mm

Other - Hinterlüftung - Kontralattung:
30 mm

Other - Unterspannbahn:
0 mm

Other - Unterdach (OSB-Platte):
20 mm

Other - Sparren mit Schafwolle-Dämmung 10 cm in Längsrichtung und 8 cm in Querrichtung:
180 mm

Other - Dampfbremse und Dreischichtplatte:
35 mm

GROUND FLOOR

The entire building was raised by means of its wooden log structure, supported only by metal beams. Then the earth volume was removed at a height of about 2 m below the house to make the missing foundation strips. The ground floor slab was then made of concrete and completely thermally insulated so that the floor heating could be fully utilized. The old cellars were filled with earth and new cellars were created on the north side of the house.

Due to their low weight and flexibility, the block constructions can be completely lifted and supported with the usual technical means. This technology is therefore available to every carpentry firm. The disadvantage is the high labour costs, as the craftsmen have to be experienced and the work progresses more slowly. The advantage is that the whole building is preserved in its original state and shape.

U-value (pre-intervention) [W/m2K] 2,8 U-value (post-intervention) [W/m2K] 0,17

More Details

Original groundfloor build-up

Other - Erdreich:
150 mm

Finish - Im Erdgeschoss befand sich ein massiver Holzdielnboden. :
25 mm

Retrofitted groundfloor build-up

Floor joists - Bodenbelag Holz:
20 mm

Concrete slab - Heiz-Estrich:
70 mm

Insulation - Trittschalldämmung:
35 mm

Other - Schüttung (Liapor):
30 mm

Insulation - Dämmung EPS:
200 mm

Damp Proof Membrane - Bitumen-Abdichtung:
4 mm

Concrete slab - Stahlbetonplatte:
250 mm

MEASURES TO INCREASE AIRTIGHTNESS

The "house within a house" concept made it possible to create a new airtight level on the inside of the outer wall.

Airtightness (pre-intervention) [ach@50Pa] 10 Airtightness (post-intervention) [ach@50Pa] 1

HVAC

HEATING

VENTILATION

DOMESTIC HOT WATER

HEATING

The house in its original state was only partially heated by a tiled stove with wood.

After the renovation a boiler for wood pellets was used for space heating and hot wate. The heat is distributed to the rooms via floor heating. The technical room was built in the new extended basement next to the original house, so as not to reduce the space. The reason for the high performance heating is also the energetically extensive wellness area in the building. It is also possible to connect the neighbouring house to this heating system.

More Details

	New primary heating system
New system type	Stove
Fuel	Biomass
Distribuition system	Radiating floor
Nominal power	21,8 (1,7kW Pelletenbläser; 63W Umwälzpumpe; 57W Speicherpumpe, 32 Kesselpumpe) kW

VENTILATION

A new central ventilation system with heat recovery, humidity recovery and additional humidifation unit were installed in the building.

The ventilation ducts were led into the wooden floors and walls. As the owner said, the choice of "comfort ventilation air distribution" has resulted in a large number of ducts and a complicated distribution system. Next time he would prefer a simplified distribution system such as the " cascade ventilation principle".

Lüftungsanlage mit Wärmerückgewinnung und Feuchterückgewinnung, ©Pavel Sevela

Lüftungsalnage / Air handling unit ©Pavel Sevela

More Details

Original roof build-up	New ventilation system
Type ventilation system	Centralized
Type flow regime	Each room has an air inlet and outlet
Heat recovery	Oui
Humitidy recovery	Oui
Nominal power	0,35 kW
Electric power	0,35 kW
Control system	CO2 und Feuchtigkeit

DOMESTIC HOT WATER

The hot water is prepared centrally with a wood pellet stove in a central hot water tank and distributed by circulation to all tapping points in the building.

The reason for the high-performance heating is also the energetically extensive wellness area in the building.

The central heat tank has a volume of 744 litres.

More Details

	New DHW system
Type	with heating system
Hot_water_tank	Oui
With heat recovery	No

RENEWABLE ENERGY SYSTEMS

Biomass

See heating system

More Details

	Biomass System
Type	Pellet
Storage size
Origin of biomass
Overall yearly production	kWh

Energy Efficiency

Energy Performance

Energy performance certificate: SPECIFIC HEATING DEMAND: 65,4 kWh/m2a
Voluntary certificates: No

Energy Use

Documents:

11099_GIATLA Haus (05 2013) mit WRL.pdf

Consumption_estimation_After: 65,4 kWh/m2.y

Primary Energy
Consumption_estimation_Calculation_method: Derived from energy bills
Consumption_estimation_Including_DHW: No

Costs

Financial Aspects

The builders said that even the cost of renovation was higher than the cost of a new building. The higher costs were worth it simply because of the charm of a historic building combined with modern technology and interior comfort.

Running Costs

Lifecycle cost
No