The aim of the project of one-dwelling building is to conduct a study of thermal flux anduddiffusion of water vapour through a part of the building cladding. By means of a computerudprogram, examples of structural complexes of flat roofs of two types are made – inverted flatudroof and combined flat roof. By complying to the criteria of allowed thermal transmittance ofudflat roofs as are written in the PURES 2010 (Pravilnik o učinkoviti rabi energije v stavbah),udincluding the corresponding technical directive and the treatment of calculation method of theudthermal transmittance of building components set by the ISO 6946 standard, the effect ofuddifferent ratios of thermal insulation between the two types of flat roof on the change ofudthermal flux and the corresponding needed change of the thermal insulation thickness of theudmaterial in the system of the roofs in consideration is studied. An appendix on inverted flatudroofs is taken into account in the first part of the study of the thermal flux through structuraludcomplexes, a correction stated in the ISO 6946 standard. The latter contains a correction onudthe system’s thermal transmittance in regard to the additional heat loss due to the waterudpercolation through the juncture of thermal insulation layer. Additionally, an appeal for theudcorrection of the thermal conductivity in regard to the change of thermal conductivity of theudthermal insulation is made in the aforementioned appendix, to integrate the possible increaseudof the moisture content due to the diffusion of water vapour. This subject is represented inudthe second part of the study.
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