This master’s thesis examines the process of designing an indoor Finnish sauna, from measuring the available space and preparing the spatial layout to developing a technical solution for construction. The aim was to link the theoretical principles of Finnish saunas with the practical planning of a functional, safe and aesthetically coherent solution. The methods included a review of professional and scientific literature, measurements of the space under consideration, preparation of a floor plan and 3D model, and structural, material and technical assessments of individual components. A timber wall structure was designed for the sauna, with thermally modified aspen internal cladding, glass wool insulation, a vapour barrier and an outer hardboard layer. The interior fittings, including benches and backrests, a glazed entrance wall with a door, a salt wall, lighting and ventilation with an air inlet beside the heater and an upper vent, were also designed. The calculated sauna volume is 26.83 m³. A comparison with the operating range of the selected 15 kW heater, intended for volumes of 15–23 m³, showed that it is not adequately sized for the calculated volume, which exceeds the upper limit of its recommended operating range. To ensure adequate heating performance, the final implementation should therefore consider a more powerful heater or a reduction in the sauna volume and the thermal impact of glazed surfaces. The results show that a high-quality Finnish sauna design depends primarily on coordinating spatial constraints, thermal requirements, ventilation, material selection and safety conditions. The thesis confirms that a planned and systematic approach makes it possible to develop a technically feasible solution already in the design phase, while also considering functionality and user comfort, material durability and the requirements for safe use.
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