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This publication focuses on the assessment of the impact of structural solutions of single-family buildings with an increased energy standard on their air-tightness level. The first part presents the threats resulting from the low tightness of the building. To formulate the conclusions, quantitative and qualitative casing tightness tests of existing single-family energy-efficient buildings were carried out. Construction and material solutions used in buildings were also analysed. The obtained results indicate that there is no impact of the building structure on its level of air tightness.

This publication focuses on assessing the impact of the tightness of single-family houses with a higher energy standard on their energy demand for heating. To formulate conclusions quantitative and qualitative research, including tightness test (blower door) has been conducted in energy-efficient and passive houses. In the next step, energy demand for heating has been estimated. Based on the observation and results, the simulation of the impact of reducing the flow of infiltrated air through leaks in the buildings for energy demand for heating is calculated. The simulation results confirm the dependence between the tightness of the building and energy demand.