GENERAL INFORMATION RENOVATION PROCESS RETROFIT SOLUTIONS EVALUATION

Rožna ulica 15, Idrija

Rožna ulica 15

5280

Idrija, Slovénie

Architect

Studio M

Bazoviška ulica 5, Tolmin

Owner

Idrija municipality

Mestni trg 1, 5280 Idrija

obcina.idrija@idrija.si

+38653734500

User

Idrija municipality

Mestni trg 1, 5280 Idrija

obcina.idrija@idrija.si

+38653734500

Contact Details

Jana Podgornik

Posoški razvojni center

jana.podgornik@prc.si

+38653841500

Other Information

This building was constructed in the second half of the 19th century for the residence of mining families. It has several characteristics of the miners house which is typical for the town of Idrija and represents very unique architecture. Mercury mining in Idrija has a long tradition and also global recognition as Unesco World Heritage Site since 2012. The building was in residential use until 2004, when it was so damaged by an earthquake that it was no longer habitable. Today, the ground floor is used for business premises and the upper floors are organized as apartments. For the needs of energy rehabilitation of the building, the external walls and roof were adequately insulated. Facade ornaments were made anew in accordance with the cultural heritage office demands.

GENERAL INFORMATION RENOVATION PROCESS RETROFIT SOLUTIONS EVALUATION

Energy performance

44 kWh/m2.y

Climate Zone DFc

Altitude 330

HDD 250

Protection level Listed

Conservation Area:
Oui

Level of Protection:
heritage of local importance

Building age 1850-1899

Year of last renovation:
2018

Year of previous renovation:
0

Building use Residential (urban)

Secondary use:
Offices

Building occupancy:
Permanently occupied

Building area Net floor area [m²]: 793,0

Building typology:
Semidetached house

Number of floors:
4

Basement yes/no:
No

Number of heated floors:
4

Gross floor area [m²]:
1108,61

Volume [m³]:
3056,21

NFA calculation method:

Construction type

Stone masonry wall

External finish:
Rendered

Internal finish:
Plastered (on hard)

Roof type:
Pitched roof

+ MORE - LESS

Poor condition of the entrance extension. ©Lidija Manfreda

RENOVATION PROCESS

Architecture

BUILDING DESCRIPTION

The apartment building was built to accommodate larger mining families as it is located near one of the entrances to the mine. The main load-bearing structure consists of stone masonry walls and wooden slabs and a roof. The entrance extension was added later when new materials such as brick were available and used too. There are business premises on the ground floor, the floors were intended for apartments, the attic was unusable. After the earthquake, the load-bearing structures were thoroughly statically valorized and it turned out that it make sense to strengthen the building. The load-bearing walls were reinforced and injected, reinforced concrete ties were installed, and the wooden ceilings were replaced with reinforced concrete ones, which further strengthened and connected the load-bearing system. At the same time, the owner, the Municipality, decided to renovate the apartments on the 1st and 2nd floor and arrange an additional apartment with storage for residents in the attic. Due to the poor condition of the entrance extension, it was removed and rebuilt with auxiliary rooms for residents. For the needs of energy rehabilitation, a 15 cm layer of thermal insulation was added on the outside. Facade ornaments were made anew. The roof was also thermally insulated when arranging the attic, and appropriate building furniture such as wooden windows and doors were installed. The building is heated by gas, as there is a gas pipeline in the city.

Urban context

Idrija is a town with approximately 6,000 inhabitants in the north-western part of Slovenia, where the pre-Alpine and Karst worlds meet at a tectonic fault. Due to hilly and steep terrain, poor natural possibilities and remote location, the surroundings of Idrija were a very sparsely populated landscape. This building was constructed in the second half of the 19th century for the residence of mining families. It was built later than majority of typical miners' houses in Idrija but it still has several characteristics of this unique architecture. Nowadays it lies close to the city center and is surrounded by other residential buildings.

State of repair

Conditions of the envelope

The construction was damaged in the earthquake (stone masonry walls, wooden constructions). The aim of retrofitting was statical and energy efficiency improvement and general renovation.

HERITAGE SIGNIFICANCE

ELEMENTS WORTHY OF PRESERVATION

According to the The Institute for the Protection of Cultural Heritage of Slovenia, the following conditions for renewal were required: preserving of the roof inclination, shape, orientation and covering; position of the double wing wooden windows and its framing; facade with original elements and color. Although the color of this house was not typical for classical miners' house.

Heritage Value Assesment

The building was assessed by The Institute for the Protection of Cultural Heritage of Slovenia. It was built nearby one of the entrances of the mine around 1880 as a residential house for bigger mining families. Although it is not a typical representative of a Miner’s house in Idrija, it still has quite a few characteristic features for this particular architectural style. The most recognizable characteristics of a typical Miner's house are: steep roofs, roof windows, dormers, multi-storey and multi-residential, small windows - symmetrically placed, the load-bearing structure is a combination of stone and wood, facade is originally plastered and whitewashed, built on steep slopes.

Aim of retrofit

Renovation

Renovation after the earthquake, refurbishment for municipal appartments, improve energy efficiency of the building, to preserve the elements of architectural heritage

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

The building was renovated within the earthquake refurbishment programme.

Stakeholders Involvement

Public sector
Idrija Municipality
Mestni trg 1, 5280 Idrija

Architect
Studio M
Bazoviška ulica 5, Tolmin

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

Tools used

Was the renovation process done following a specific methodology? No

RETROFIT SOLUTIONS

External Walls

stone masonry wall

The outside walls were statically reinforced. For the needs of energy rehabilitation, a 15 cm layer of thermal insulation was added on the outside. Facade ornaments were made anew.

U-value (pre-intervention) [W/m2K]: 1,51 W/m²K U-value (post-intervention) [W/m2K]: 0,21 W/m²K

More Details

Original wall build-up

Plaster - external:
30 mm

Stone - wall:
500 mm

Plaster - internal:
30 mm

Retrofitted wall build-up

Plaster - thin layer facade:
3mm

Insulation - thermal insulation:
150 mm

Stone - wall:
500 mm

Air gap :
12 mm

Other - Gypsum gypsum board insulation:
12 mm

Windows

Facade windows

Window replicas were made specially for the building according to the conservation plan.

Existing window U-value Glass [W/m2K]: 5,8 New window U-value Glass[W/m2K]: 1,1

More Details

Existing window type	Box-type window
Existing glazing type	Single
Existing shading type	NA

New window type	Casement window
New glazing type	Double
New shading type	NA

Other interventions

ROOF

GROUND FLOOR

ROOF

U-value (pre-intervention) [W/m2K] 3,3 U-value (post-intervention) [W/m2K] 0,15

More Details

Original roof build-up

Other - corrugated asbestos cement roof panels:
13 mm

Other - roof timber frame:
100 mm

Retrofitted roof build-up

Tiles - clay:
20 mm

Other - sub-structure wood:
20 mm

Other - thermal insulation:
220 mm

Other - Damp Proof Membrane:
1 mm

Other - Gypsum gypsum board insulation:
12 mm

GROUND FLOOR

U-value (pre-intervention) [W/m2K] 2,8 U-value (post-intervention) [W/m2K] 0,27

More Details

Original groundfloor build-up

Finish :
10 mm

Other - cement floor screed:
50 mm

Concrete slab :
100 mm

Retrofitted groundfloor build-up

Finish :
10 mm

Other - cement floor screed:
60 mm

Insulation - thermal insulation:
120 mm

Insulation - hydro insulation:
10 mm

Concrete slab :
100 mm

HVAC

HEATING

DOMESTIC HOT WATER

HEATING

The building is connected to the gas grid of the town.

More Details

	New primary heating system
New system type	Boiler
Fuel	Gas
Distribuition system	Radiators
Nominal power	45 kW kW

DOMESTIC HOT WATER

Common gas boiler is being used both for heating and preparation of domestic hot water. There was no influence on protected elements.

More Details

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

Energy Efficiency

Energy Performance

Energy performance certificate: energy audit
Voluntary certificates: No

Energy Use

Heating
Primary Energy 97 kWh/m2.y
Consumption_estimation_After: 44 kWh/m2.y

Primary Energy
Consumption_estimation_Calculation_method: Steady state simulation (e.g. EPC, PHPP)
Consumption_estimation_After: 97 kWh/m2.y

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 overall budget is a combination of national and local public funding (Municipality of Idrija).

Investment Costs

Total investment costs
683.000 EUR (total)

Running Costs

Lifecycle cost
No