RENOVERING AV MILJONPROGRAMMET TILL PASSIVHUS : Implementering av tysk prefabteknik

Sammanfattning: Construction accounts for about 35 percent of the total Swedish energy consumption and most of the energy is used by the large housing stock from the so-called “Million program”.   In the national action plan the government has put forward in energy efficiency. It is mentioned that existing buildings account for more than 90 percent of what is expected to be the housing stock within the coming 50 years. In order to meet environmental objectives its required that the existing stock be reviewed for energy efficiency.   The goverment is now initiating a national framework with a budget of SEK 300 million Swedish crowns per year for five years, starting in 2010 to achieve the goal on energy efficient buildings. Energy efficiency of buildings in both new construction and above all within the existing stock are addressed. In order to use this money as effectively as possible it is necessary to have a good plan, and adequate knowledge of minimizing energy use in the buildings will be done the possible way.   In Germany, the use of Passive House technology have been successive and increases with steady pace. In Sweden we have not come as far. It is mainly in new production that the Passive House concept has been suitable in Germany, but it has also been proven that it is possible to refurbish buildings similar to the so-called Million program houses to Passive Houses. Prefabricated facade elements have been used to this puspose.   This is a technology that is still unknown of in Sweden. It has good potential to be developed towards the industrialization of the prefabricated components aimed for the refurbishment of the Million program stock.   Meanwhile Swedish contractors are waiting for results from a refurbishment project in the city of Alinsås, where buildings in the neighborhood Brogården were recently renovated with Passive House technology. The first measurement data will be available by the spring 2010. Alingsås has launched a starting point for the Swedish construction industry with a cencept that applies passive house technology?   This work has studied how the construction industry looks at the refurbishment of the Million program stock to Passive Houses and wheater a smiliar concept as the one used in Germany with prefabricated facade elements are interesting for the Swedish market today. Literature study was carried out on the Passive House concept and on the German model. A series of interviews with various stakeholders from the construction industry was conducted.   The findings are that there is not much interest to refurbish the stock of Million program towards Passive Houses. However, there is an interest for a large refurbishment towards low energy houses. In this concept, aspects of the Passive House concept are taken and adapted to the refurbishment towards low energy houses. The concept doesn´t take into account thermal briding and insulation of the ground floor, wich is considered to be too extesive and costly.