This thesis examines whether it is possible to improve the energy efficiency in a building from 1967 without ruining the exterior or the architecture from that era. The project is aiming to research the exterior walls, roof, windows and doors and will focus on the preservation rather than the development costs. This example will hopefully inspire others planning to work on similar projects.
The measures chosen to improve the energy efficiency are interior insulation of the exterior walls, additional insulation on the attic joist and replacement of windows and doors. These measures will reduce the specific energy consumption with 57 kWh/m2year, which results in a new value of 148 kWh/m2year. Lowering the need of energy is a positive result but cannot really be compared with the energy consumption of a new building. It is worth to acknowledge that the result only covers the climate shell which means that if for example the heating and ventilation systems are replaced, the energy consumption will improve even more.
The exterior walls and attic joist have been checked for distribution of moisture content, both before and after the additional insulation. The initial calculations indicate that all the structural parts risk condensation except the concrete wall. This can be corrected with further calculation, which results in acceptable levels of moisture content. The condensed amount of water during January is so small that it confirms that the structure will not have any problem to dry out during the warmer months. The attic joist with added insulation is the only part that indicates risk of condensation, even after correction.
The results have been controlled by Maria Löfgren, who works as an architectural curator at Västerbottens Museum, to check that the taken measures will keep the building’s exterior intact. The conclusion of this thesis is that it is possible to improve the energy efficiency in a 60’s building without ruining its characteristics or architectural values. It is worth to do some further research regarding how the additional insulation affects the distribution of moisture content but the other measures are otherwise relatively easy to execute. The most important aspect regarding renovation and improvement of an older building is to have respect for the architecture and the cultural values of that era. If it is necessary to change materials or objects it is important to find replacements that are as similar to the original as possible.