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Kindergarten in Vilnius

Two-layered masonry 2 x 11 cm, cold winter. Instead of facade insulation with polystyrene on the advice of a German construction expert: Core insulation with cellulose and ThermoShield inside and outside; Golden Globe Award 2011


In February, a series of construction measures were discussed in the context of an object approach with the following focuses: rain-proof windows DG, plaster patches facade, insulate reveals, replace foam under the window sheets, facade and interior paint, replace southern gables, paint wooden gable verge, vibrancy reduction ceiling grid with KG.

On 11.02.2007, it was -23 ° C on the outskirts of Vilnius. They were measured at room temperatures of 19 ° C and wall surface temperatures of 16 ° C. Considerable temperature differences of the wall surface temperatures of the facade showed the measurements with the pyrometer for non-contact temperature measurement. This shows what the term "solar gains of opaque components" means: the heat flow from 20 ° C to -10 ° C is lower than that of 20 ° C to -20 ° C.

In order to improve the energetic quality of the exterior walls, the building expert advised the use of ThermoShield. Reasons for this are, inter alia, protection against solar load in summer, compensation of heat bridges, protection against driving rain, improvement of thermal comfort. The practical benefit agrres with this planning approach, the following experience report is self-explanatory.

"We used ThermoShield for renovation work at our kindergarten in summer 2007 both inside and outside. While we had to reheat again in the middle of the night and during the day, the house is now to be kept warm with heating twice, even at temperatures of -20 (January 2009). We are enthusiastic about the properties: in spite of the extreme Lithuanian conditions of -20 ° C in winter to almost 30 degrees in summer, ThermoShield does not fade and there are no cracks to be seen, either on the wood trim or on the plaster – a big problem of many colors over here, and to be seen at almost every corner at a city tour through Vilnius."

Short summary
The kindergarten "Saules Gojus" (Sonnenwäldchen) is located on the outskirts of Vilnius. With approximately 500 m², the house can accommodate up to 45 children. In the course of the first renovation phase in 2004, a core insulation of cellulose flakes was blown into the air gap of the outer walls. In the second phase, a coating was applied inside and outside with the thermocamamic membrane technology ThermoShield to improve the heat protection. As a result, the heating effort could be reduced and the cooling time extended - with improved thermal comfort and reduced mold risk even in problem zones. In addition to long-lasting weather protection of the dehumidified wall, the coating protects against heat radiation in winter and heating in summer.

Evaluation criteria

  • Project goal:
    Energetic renovation, max. results at a small budget of a young family-run company (economy), long-lasting ecological building materials with physical and health-related harmlessness.
  • Innovative approach:
    Not doing what everyone around is doing - instead the combination of technologies / systems, use of surface-active coating..
  • Cost/benefit:
    A maximum revaluation of the building with modest financial expenditure (see also: project goal), long maintenance intervals, the goal (high benefit at low costs) was achieved.
  • Scalability:
    In principle yes, whereby the individual case has to be checked - here the special feature was the core insulation, other combinations are also possible (see project "Holzfaser WDVS in Berlin").
  • Environmental compatibility:
    Exists to a very high degree, toxic and pollutant-free building materials, as a result emission reductions are given.

In the first stage of the renovation the sanitary facilities and the entire electrical system were renovated and the house adapted to the needs of the children. Important was the energetic upgrading of the exterior walls, which had a U-value of 0.8 W / m²K as a two-shell masonry with an air gap of 7 cm. Although the U-value for the energy performance of the building is not the only factor, it is nevertheless a characteristic parameter to be observed in winter temperatures of around -20 ° C.

The specialist discouraged that the facade was covered with styrofoam plates as ETICS, as has often been the case throughout the country. An important reason is that it is considered inconsistent to build more densely from the inside to the outside - even where it is known that the calculations by standard, including glaser method, do not yield realistic results (Hauser, 2003).

With a core insulation with EKOVATA cellulose flakes, the U-value could be improved to 0.37 W / m²K, whereby a decisive advantage is that a fully sorption-capable wall construction with capillary conductivity is present.