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Robust solutions for internal retrofitting solid masonry walls in historic buildings with regards to hygrothermal performance
The built environment is estimated to be responsible for nearly 40% of the world’s total energy usage, and 30-40% of the emissions. Approximately 40% of the European building stock was constructed before 1960, and these buildings often have large heat losses through the building envelope and perhaps also thermal comfort issues. A large share of the aforementioned buildings have an exterior appearance worthy of preservation due to their historic or aesthetic values which prevents the use of renovation measures that could compromise these values. In terms of retrofitting the façade walls, external insulation is often prohibited leaving internal insulation as the only remaining option. However, internal thermal retrofitting solid masonry walls is generally regarded as risky since the added insulation causes the existing wall structure to become colder and wetter, which increases the risk of interstitial condensation. In addition, the added insulation reduces vapour diffusion drying to the room side. These factors contribute to elevated moisture levels in the wall structure and an increased risk of moisture induced damage. Consequently, there exists a need for defining robust methodologies for the installation of internal insulation of historic solid masonry walls, which do not cause hazardous fungal growth or other undesirable issues e.g. decay of embedded wooden elements. The purpose of this study was, in a large field experiment, to investigate several either diffusion-open or diffusion-tight insulation systems to determine if it is possible to internally retrofit solid masonry walls without causing hazardous fungal growth. The investigated diffusion-open insulation systems were: polyurethane with calcium silicate channels, monolithic calcium silicate, lightweight autoclaved aerated concrete, and lime-cork based insulating plaster. The diffusion-tight systems were: phenolic resin foam, and traditional mineral wool with a vapour barrier. These systems were examined in combination with exterior hydrophobisation. ...
Robust solutions for internal retrofitting solid masonry walls in historic buildings with regards to hygrothermal performance
The built environment is estimated to be responsible for nearly 40% of the world’s total energy usage, and 30-40% of the emissions. Approximately 40% of the European building stock was constructed before 1960, and these buildings often have large heat losses through the building envelope and perhaps also thermal comfort issues. A large share of the aforementioned buildings have an exterior appearance worthy of preservation due to their historic or aesthetic values which prevents the use of renovation measures that could compromise these values. In terms of retrofitting the façade walls, external insulation is often prohibited leaving internal insulation as the only remaining option. However, internal thermal retrofitting solid masonry walls is generally regarded as risky since the added insulation causes the existing wall structure to become colder and wetter, which increases the risk of interstitial condensation. In addition, the added insulation reduces vapour diffusion drying to the room side. These factors contribute to elevated moisture levels in the wall structure and an increased risk of moisture induced damage. Consequently, there exists a need for defining robust methodologies for the installation of internal insulation of historic solid masonry walls, which do not cause hazardous fungal growth or other undesirable issues e.g. decay of embedded wooden elements. The purpose of this study was, in a large field experiment, to investigate several either diffusion-open or diffusion-tight insulation systems to determine if it is possible to internally retrofit solid masonry walls without causing hazardous fungal growth. The investigated diffusion-open insulation systems were: polyurethane with calcium silicate channels, monolithic calcium silicate, lightweight autoclaved aerated concrete, and lime-cork based insulating plaster. The diffusion-tight systems were: phenolic resin foam, and traditional mineral wool with a vapour barrier. These systems were examined in combination with exterior hydrophobisation. ...
Robust solutions for internal retrofitting solid masonry walls in historic buildings with regards to hygrothermal performance
Jensen, Nickolaj Feldt (author)
2021-01-01
Jensen , N F 2021 , Robust solutions for internal retrofitting solid masonry walls in historic buildings with regards to hygrothermal performance . Technical University of Denmark, Department of Civil Engineering .
Book
Electronic Resource
English
DDC:
690
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