Paroc Passive House Pilots

Paroc Passive House Pilots
Paroc has notable experience in constructing low-energy buildings and regularly contributes to the construction and building of passive houses in several markets. Below you can find information about four of our test pilots in Sweden, Finland (two projects) and Lithuania.


The Paroc passive house pilots aimed to improve general awareness of passive building technology and strengthen the fight against climate change. Passive buildings have considerable potential to reduce CO2 emissions.

Passive houses are by no means a new concept. The first passive house in Germany was built already in 1989, and today there are approximately 10,000 passive houses. Most of these are located in Germany and Austria, but there are also a few hundred in Sweden. Paroc, however, built the first passive house in Finland and also the first in Stockholm, Sweden.

Passive buildings are expected to become standard within the EU by 2015.

Paroc has participated in a number of different passive house projects. Here you can see some good examples on how you can build an energy-efficient passive house.

Click on the tabs to be inspired by examples from Sweden, Finland and Lithuania.

Paroc Passive House is the first passive house in Finland

Paroc Passive House, Tikkurila

Paroc Passive House, Paroc's pilot project and at the same time the first passive house in Finland in accordance with VTT's definition, was completed in Tikkurila in Vantaa in May 2009. The house was granted a Passive House Certificate in April 2010.

Paroc Passive House is a two-storey semi-detached house for two families. Each family has a total floor area of 187 m2 and a volume of 540 m3.

The floor structure lies on top of a 100 mm thick concrete slab above a 300 mm thick insulation layer. The foundation is made of concrete with insulation on all sides.

Both families wanted a stone-based house. Therefore, the external walls of the house were made using the PreWIS I method at the precast concrete element factory. This means that a 450 mm thick PAROC FAL 1 lamella was attached to a 150 mm thick concrete core with the concrete’s own adhesives. The concrete panel surface was weatherproofed using a thin layer of mortar. The final thin rendering layer was applied on the building site.

The roof is a pitched roof structure with timber roof trusses and the thermal insulation solution is "PAROC Tuplavarma", a double layer solution consisting of PAROC eXtra slabs (100 mm) + PAROC blowing wool (approx. 500 mm) above it.

In the design and solutions of the Paroc Passive House, the building volume and the window sizes are also optimised to meet the residents’ needs. The windows have new special frames especially suited for passive buildings, and the doors are energy-efficient. The windows and doors were supplied by Diago Windows.

In the Paroc Passive House, all HVAC installations were made inside the air tight layer and all necessary penetrations and connections were carefully sealed.

The two families selected their ventilation units (and heat recovery units) from different suppliers, one from Enervent and the other one from Vallox. If required, the ventilation units can also utilise the heat brought from the ground source heat pipes installed close by the house. All supply air units in the rooms have an electrical heating unit with thermostat to guarantee comfort, even during the coldest period in winter. These heating units from the RCL consume a very small amount of electricity.

For added comfort, the sauna and bathrooms have floor heating.

Design data

External wall 0.09W/m2K
Roof  0.07 W/m2K
Floor  0.10 W/m2K
Windows  0.7…0.8 W/m2K
Doors  0.4 W/m2
Air exchange  0.5 times/h 
Ventilation air flow  0.075 m3/3 
Air tightness  n50: ≤0.60 1/h *
Heating energy demand  18.7 kWh/m2/a


Construction Phase

Construction work started on-site in December 2007 and the house was completed in May 2009.


In April 2010, Paroc granted the house the first-ever Passive House Certificate in Finland. The Passive House Certificate is based on a certificate granted by VTT, defining the quality criteria for a passive house.


VTT (Technical Research Centre of Finland) has participated in the project from the start and will continue to measure and follow up i.a. energy consumption for several years after completion.
*) Air tightness was measured on 26 March, 2009 and it was the TIGHTEST HOUSE IN FINLAND: the n50 air leakage figure for the Vuoritsalo family was 0.34 l/h, and for the Tuominen family - it was 0.25 l/h. According to present building regulations, the figure is 4 l/h.
*) Air tightness was measured on 26 March, 2009 and it to was the TIGHTEST HOUSE IN FINLAND: the n50 air leakage figure for flat B was 0.34 l/h and for flat A - it was 0.25 l/h. According to present building regulations, the figure is 4 l/h.

Ached forms are characteristic for Passive House Paroc Lupaus

Passive House Paroc Promise, Lupaus

Paroc Promise was completed for the Housing Fair in Valkeakoski in the summer 2009 and was presented at the fair as house number 21. Paroc Promise was the only passive house at the fair that met VTT’s criteria criteria for a passive house and the public voted it the second best house of of the fair.

Paroc Promise is a two-storey detached single-family house with a total floor area of 234 m2.

The foundation is a ready-made form from Soklex. The ground floor lies against the ground. The footing was also insulated.

The external walls of the timber-framed house were prefabricated elements from Fennotalo, incorporating 410 mm thick PAROC eXtra thermal insulation and 70 mm thick PAROC WPS 3n wind protection insulation. The arched parts of the walls were also prefabricated at Fennotalo by CNC machining. The rendering of the ventilated facade was applied on plaster board. 

The pitched joist roof consists of timber roof components and roof trusses and is insulated with 600 mm thick fire-safe PAROC eXtra thermal insulation slabs.

The ventilation unit supplied by Enervent ensures good indoor air quality. Heat generated by the occupants and household appliances is recovered and used for heating the house. As a result, the ventilation also functions as a heat distribution system in the house. In the upstairs rooms, the ventilation system inlet air blower has thermostat-controlled thermal resistance in every room for temporary additional heating requirements; for instance, during extremely cold winter periods. For added comfort, the downstairs and bathrooms have water-circulated underfloor heating with air-source heat pumps as the main energy generator.

The windows and doors are Alfa class windows and doors manufactured by Skaala. The windows have 2 + 2 glazing. The windows facing south are mostly operable, whereas the windows facing north are fixed. The front doors are durable, low-energy doors. The glazed terrace doors have a sound insulation level of 30-35 dB.

The Paroc Promise’s interior design was done by Johanna Sippala. She is well-known in Finland from the interior design television programme Inno on TV channel Nelonen. The main themes of harmony and cosiness are widely appreciated.

VTT (Technical Research Centre of Finland) has participated in the project from the design phase and will continue to follow up i.e energy consumption for several years.

Construction phase

Project design started in 2007 and construction work started in the summer 2008.

Paroc Promise Lupaus drawing

Paroc Promise Lupaus drawing

Paroc Promise Lupaus drawing  
Conceptual drawing Conceptual drawing Conceptual drawing
Paroc Promise Lupaus sketch Paroc Promise second floor Paroc Promise first floor Paroc Promise Kimmo
External sketch Drawing first floor Drawing second floor

Kimmo Lylykangas, architect SAFA

Paroc Promise attic construction

Paroc Promise external wall construction

Paroc Promise ceiling

Paroc Promise Johanna Sippala

Attic construction

External wall construction

Vaulted interior ceiling

Johanna Sippala

Paroc Promise interior decoration Paroc Promise interior Paroc Promise Lupaus interior

Paroc Promise Lupaus interior

Interior decoration Interior Interior Interior

Implemented values



Paroc Passive House Concept Passive House Paroc Promise
Gross floor area m2  


Gross volume m3  


Door and window openings/gross-m2(%)  


External wall (W/m2K)

0.07 - 0.1


Roof (W/m2K)

0.06 - 0.09


* Roofing  


* Terrace  


Ground floor (W/m2K)

0.08 - 0.01

* alongside wall  


* middle of floor  


Window (W/m2K)    
* fixed

0.6 - 0.8


* operable

0.7 - 0.9


Door (W/m2K)

0.4 - 0.7

* solid  


* glazed  


Air leakage figure n50 (l/h)

< 0.6


Heat recovery, annual efficiency (%)

> 75


Heating energy requirement (kWh/m2)

≤ 25


Passive House Pilot Lithuania

ParocPassive House , Lithuania

The first Paroc Passive House in Lithuania was built by UAB „Veikmė“ in the block of individual houses in Vilnius city, close to Lake Gulbino. The architect responsible is Rytis Kripas.

The building is a two-storey house with an integrated garage designed for one family, and it has a total area of 224.56 m2. It has two types of exterior walls: (rendered walls and ventilated walls) and the load- bearing structure is ceramic brick masonry. The rendered wall part is insulated with facade lamellas PAROC FAL 1, 350 mm thick with render on top. The ventilated wall part is insulated with PAROC UNS 37z, 300 mm thick, and PAROC WAS 25t, thickness 50 mm thick, and finished with timber cladding.

The ground floor is insulated with PAROC ROS 30, in 300 mm thick, and along the perimeter of the house is an additional 100 mm thick slab. The total thickness along the perimeter is 400 mm. The load-bearing structure of the pitched roof is made of timber I-rafters insulated with 450 mm thick PAROC UNS 37z, and 50 mm thick PAROC WAS 25t.

Design data:

External wall  0.10W/m2
Roof  0.08 W/m2K
Floor  0.12 W/m2K
Windows 0.78 W/m2
Doors  0.80 W/m2
Efficiency rate of the heat-exchanger  ≥81.4%
Air tightness  n50: ≤0.40 1/h (value measured during testing) 
Heating energy demand

≤15kWh/m2 (space heating)


Construction phase:

The project design started in March 2008. Building activities started in February 2009 and the house was finished in November 2009.

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