Basic solutions for the renovation of lightweight brick walls of Estonian detached houses

The aim of this work was to analyze the pre-renovation condition, renovation needs, heat loss before renovation and solutions to minimize heat loss of typical lightweight brick walls of Estonian private houses. Additional insulation of brick walls is necessary to reduce the heat loss of the building. On average, heat loss from the external walls of unrenovated detached houses accounts for 30% of total heat loss of the building. With additional 250 mm thermal insulation, the heat loss of the external wall decreases by 67 - 76 %. Only injection of foam inside the cavity wall cannot significantly decrease the thermal transmittance of external walls in Estonian cold climate. Due to the binding stones in the wall, thermal bridges remain and the insulation is not efficient. Additional insulation from the outside is more effective solution.