Foto: Stadsmuseet i Göteborg
Due to low degree of renovation of brick buildings constructed 1870-1930 and higher demands regarding the energy performance of buildings based on environmental goals, it is of interest to evaluate how to renovate this building type to fulfil this aim. Although, some renovations has been made. But, because of insufficient follow-up of the status of these renovations, it is also of importance to evaluate what type of second improvement that should be performed. In this work, literature research and study visits to objects representative for the selected type of houses has been done to evaluate renovation strategies performed on the inspected buildings. The aspects used to evaluate the renovation are energy consumption, U-value, moisture risks and the aesthetics of the building, before and after the renovation.
The study visits confirmed what could be found from the literature, observed building techniques correlated to the ones from the books. Differences in details was noted when the objects was compared towards each other, but the details could be found in descriptions of the building type that the literature supplied. Typical for the brick buildings that was investigated are that they have homogenous bearing outer walls made of brick and floor slabs made of timber. Both red and yellow bricks are used. The foundation walls are commonly constructed by a combination of bricks and dry stone walls or only bricks. The roof trusses and roof construction offers area that possibly could be converted from storage and unused attic to apartments.
Efficient renovations due to moisture risks are to cover the outer walls from rain or to replace the timber in the details of the outer walls with non-organic material. Due to energy consumption and U-value, to convert the attic into apartments and to insulate at least one of the external wall in combination could provide an efficient result. To consider the aesthetics, efficient strategies preserve the design and architectural ideas of the building. Although, energy efficient renovations tend not to preserve the aesthetics.