Hygrothermal performance of thermally upgraded log walls of an in-use cultural heritage building from the 17th century based on current and future climate scenario
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Norway is a country with a tremendous number of historic buildings and maintaining these is important for several different reasons. However, climate change leads to a warmer and more humid environment which in turns leads to an increased risk of biological, chemical, and mechanical decay. This master thesis has been centred around evaluating the hygrothermal performance of the log walls of the in-use cultural heritage building of Bentegården, located in Tønsberg. This building is the oldest of its kind in the city and has over the years been thermally upgraded through several different occasions. This has resulted in a building containing a large variety of solutions. A 3D scanning has been performed to create a digital model of the building. Supplied by historical documentation, local knowledge and infrared thermography, this has created a basis for determining the hidden elements within the building envelope. Numerical simulations have been conducted for the different wall assemblies with current and future climate data primarily based on observed data from weather stations and a “business as usual” climate scenario. The results indicated little to no risk of mould growth in the logs subjected to the current climate. However, there are evidently a greater risk of mould growth in the future according to the hygrothermal simulations, especially where the timber is not protected by exterior insulation.