GENERAL INFORMATION RENOVATION PROCESS RETROFIT SOLUTIONS EVALUATION

Notarjeva vila

Brunov drevored 17

5220

Tolmin, Slovenia

architetto

Teja Savelli, Projekt d.d.

Kidričeva 9a, 5000 Nova Gorica

Owner

Občina Tolmin

Ulica padlih borcev 2, Tolmin

User

Občina Tolmin

Ulica padlih borcev 2, Tolmin

Contact Details

Jana Podgornik

Posoški razvojni center

jana.podgornik@prc.si

Other Information

The house was built after the 1st world war as notary's villa in the former periphery of Tolmin where richer buildings were located. The house expresses the characteristics of secession and is listed in the Register of Slovene cultural heritage. Firstly served as a single family house, after the 2nd world war it was used for State security administration. Later it was rearranged to a four apartment building. The earthquakes in 1998 and in 2004 caused severe damage on the building. It was therefore included in the national programme of renovation after the earthquake.

GENERAL INFORMATION RENOVATION PROCESS RETROFIT SOLUTIONS EVALUATION

Energy performance

28 kWh/m2.y

Climate Zone Dfc

Altitude 200 s.l.m.

HDD 220

Protection level Listed

Conservation Area:
No

Level of Protection:
Listed in national register of cultural heritage

Building age 1900-1944

Year of last renovation:
2015

Building use Residential (urban)

Secondary use:
NA

Building occupancy:
Permanently occupied

Building area Net floor area [m²]: 412,15

Building typology:
Detached house

Number of floors:
3

Basement yes/no:
Si

Number of heated floors:
3

Gross floor area [m²]:
549,3

Thermal envelope area [m²]:
442,0

Volume [m³]:
1685,89

NFA calculation method:

Construction type

Brick masonry wall

External finish:
Rendered

Internal finish:
Plastered (on hard)

Roof type:
Pitched roof

+ MORE - LESS

RENOVATION PROCESS

Architecture

BUILDING DESCRIPTION

The building size is 15,35 x 12,70 m and constitutes of the basement, ground and first floor and the attic. The construction is made of bricks, the ceilings are wooden. The roof has four sloping sides with the elevation of 30°. The house was built in the town walking area in secession style. The facade was still in its original state. Originally this was a single family house with elements that showed the wealth of the owner. The investor wanted to insulate the walls from the outside but the facade itself was one of the main protected elements of the building (in addition to the size, roof inclination, colour of the facade, windows, etc.). In the end it was allowed to do it because the facade elements were so damaged that they rather made a replica of all elements and integrated them on the new facade. All the other elements of protection were respected. In the renovation 2 additional apartments were established, in total there are now 6 apartments.

Urban context

The building is part of a small town Tolmin, close to the park and town centre. Due to the size there is no public transport, but all services are within walking distance.

State of repair

Conditions of the envelope

The outside of the building was still in its original state. This was the only villa from the time after the first world war that hasn't been changed up to now. The only reconstruction was done inside to adjust it for the needs of appartments.

HERITAGE SIGNIFICANCE

ELEMENTS WORTHY OF PRESERVATION

The bulding is listed in the national cultural heritage register. The heritage office highlighted the importance to keep the dimensions of the construction and the roof while maintaining the facade with ornaments. The investor had to respect the window openings and frames as well as the doors. The demand was also to keep the balconies with iron fences and a stone staircase at the entrance.

Heritage Value Assesment

The house was built after the 1st world war as notary's villa in the former periphery of Tolmin where richer buildings were located by the park of the town. It is the only one that preserved completed external image (characteristics of secession) and is listed in the Register of slovene cultural heritage. The protection of the cultural heritage is to preserve the design, materials, production, placement in the environment and area of influence. The first idea was to allow only inner insulation of the walls but after discussing possibilities the autohorities allowed also insulation from the outside. This meant removal of ornaments from the facade and replacement with full replicas after the insulation layer. This compromise was necessary to optimise the inner space in the best possible way.

Aim of retrofit

Renovation

The building was used for apartments already before the earthquakes. Due to the damage it was evaluated and there was a decision for a full refurbishment including statical improvement and energy efficiency. With the renovation the building gained additional rooms.

Was there any change of use?

The house was first used for services, the municipality decided to use it for social housing after the renovation.

Was the intervention planned following a step-by-step approach?

The building was part of the earthquake refurbishment process that followed the necessary steps, later it was upgraded also with municipal needs. The basic funding was dedicated to statical improvement of the construction, everything else had to be financed by the investor.

Lessons learned

Cultural heritage first only allowed refurbishment of the original facade with ornaments and pointed out internal insulation as the only possible way. After a detailed analysis of the walls, ornaments and other important elements, they acknowledged that it is in a very bad condition and refurbishment would not be possible. In addition they decided to allow minimum outer insulation with full replica of the original facade including ornaments.

Stakeholders Involvement

Public sector
Municipality of Tolmin
Ulica padlih borcev 2, 5220 Tolmin

Architect
Teja Savelli, Projekt d.d.
Kidričeva 9a, 5000 Nova Gorica

Conservation Consultant
National Institute for the Protection of Cultural Heritage in Slovenia
Delpinova ulica 16, 5000 Nova Gorica

Energy Consultant
Branko Hrast s.p.
Na Petelincu 4, 5220 Tolmin

Structural Engineer
National technical agency for renovation after earthquakes
Gregorčičeva ulica 10a, 5220 Tolmin

Tools used

Was the renovation process done following a specific methodology? Renovation after the eartquake.

Energy calculation - mandatory energy audit was performed.
Hygrothermal assessment - no.
Life Cycle Analysis (LCA) - no.
Other - no.

RETROFIT SOLUTIONS

External Walls

brick, stone, concrete wall

The protected facade elements had to be replaced in order to insulate the walls and maintain the visual identity of the building. Replicas of the elements were made under the supervision of the heritage office.

U-value (pre-intervention) [W/m2K]: 0,86 W/m²K U-value (post-intervention) [W/m2K]: 0,23 W/m²K

More Details

Original wall build-up

Plaster :

Brick :
480 mm

Plaster :

Retrofitted wall build-up

Plaster - Baumit Edelputy spezial:
10mm

Plaster - Baumit Haftmoertel:
10 mm

Insulation - Ursa SF 32:
100 mm

Render :
480 mm

Plaster :
15 mm

Windows

Wooden windows

The windows had to be replaced. As they are an important visual element of the protected facade, they were made by a carpenter under the supervision of the heritage office.

Existing window U-value Glass [W/m2K]: 2,4 New window U-value Glass[W/m2K]: 1,1 Existing window U-value Frame [W/m2K]: 2,0 New window U-value Frame [W/m2K]: 1,5

More Details

Existing window type	Box-type window
Existing glazing type	Single
Existing shading type	Outer shutter

New window type	Casement window
New glazing type	Double
New shading type	Outer shutter

Other interventions

ROOF

GROUND FLOOR

ROOF

There was a demand by the heritage office to keep the same inclination of the roof and also roof covering should follow local traditions.

U-value (pre-intervention) [W/m2K] 1.5 U-value (post-intervention) [W/m2K] 0.15

More Details

Original roof build-up

Tiles :
110 mm

Other :
0 mm

Retrofitted roof build-up

Tiles :
110 mm

Other - battens:
70 mm

Other - foil:
1 mm

Other - wooden layer:
21 mm

Other - insulation ursa sf 32:
200 mm

Other - drywall:
10 mm

GROUND FLOOR

More Details

Original groundfloor build-up

Retrofitted groundfloor build-up

Other - cement finish:
70 mm

Insulation - XPS:
100 mm

Other - AB concrete:
180 mm

Damp Proof Membrane :
1 mm

Other - concrete base:
100 mm

HVAC

HEATING

DOMESTIC HOT WATER

HEATING

Centralised biomass (pellets) instead of individual heating systems.

More Details

	New primary heating system	New secondary heating system
New system type	Boiler	NA
Fuel	Biomass	-
Distribuition system	Radiators
Nominal power	48 kW kW	- kW

DOMESTIC HOT WATER

Heat pump.

More Details

	New DHW system
Type	air - water
Hot_water_tank
With heat recovery

RENEWABLE ENERGY SYSTEMS

Biomass

The boiler is using pellets provided by a local company.

The whole system is installed in a way that doesn't affect the visual identity of the building.

More Details

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

Energy Efficiency

Energy Performance

Energy performance certificate: Energy audit
Voluntary certificates: No

Energy Use

Heating
Primary Energy 31 kWh/m2.y
Consumption_estimation_After: 28 kWh/m2.y

Primary Energy
Consumption_estimation_Calculation_method: Steady state simulation (e.g. EPC, PHPP)
Consumption_estimation_After: 31 kWh/m2.y

Measured Parameters

UserBehavior
Type_of_monitoring: Continuous
Description: Energy audit.

Costs

Financial Aspects

The building was damaged in the eartquake and included in the national programme of refurbishment that was managed by the technical office. The planned intervention was based on statical improvement of the construction. The owner Municipality of Tolmin later decided to also insulate the building, improve living conditions and invest in a new heating system. The overall budget is therefore a combination of national and local public funding.

Investment Costs

Total investment costs
550.000 EUR (total)

Running Costs

Lifecycle cost
No