Summary

In the housing area of Gårdsten, the public housing company Gårdstensbostäder has renovated four residential buildings with a focus on energy efficiency, the integration of renewable energy, sustainable design and improved quality of life. The renovation was planned and performed in close co-operation with the tenants.

Background
The original housing had been developed as part of the 'Million Homes Programme', which operated between 1960 and1970, but the area declined very rapidly after its construction. The buildings themselves deteriorated, and services became almost non-existent. In the mid 1990s, Gothenburg's municipal housing company, decided to take action to avoid further deterioration of the neighbourhood, and in 1997 Gardstensbostäder was created with the specific role of regenerating this housing area

Implementation:
The solar renovated area is divided into three blocks. One block consists of 2-3 three-storey buildings and 1 seven-storey building. Together with laundry facilities and bicycle storage, a community greenhouse is situated in the ground floor of each seven-storey building. The greenhouse is shared by the tenants living in one block. Before the renovation, there were problems with cold bridges on the east and west facades of the 7-storey buildings. Therefore, 100 mm external insulation of mineral wool covered with plaster was added. The south facing balconies of the 7-storey buildings have been covered with a new glazing system. This consists of frameless single glazing, which can be fully opened during summer. It is designed for preheating of fresh air to the apartments. New heat recovery ventilators (HRVs) have been installed in new ventilation rooms, situated on the roofs of the three-storey buildings. The heat exchanger has 70% efficiency.

Results

• Prefabricated roof modules of flat plate solar collectors have been installed on the south-facing part of the new roofs of the seven-storey blocks. The modules function structurally as both solar collector and roof. An innovative air heated solar system has been applied to one of the three-storey buildings
• Heat recovery systems have been installed on the roofs of the three-storey buildings
• Communal greenhouses have been equipped with climate controlled shading devices to avoid overheating.
• Existing damaged windows were replaced by new windows with argon filled low energy glazing to improve energy efficiency.

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