Radonbelastung in Passivhäusern


Passive houses become more and more state of the art for the construction of new houses. One of the construction characteristics is the air tightness and the usage of ventilation systems with heat recovery. Radon, which can cause cancer, is a radioactive material which comes mainly from the soil under a house.

This project examines the influence of passive houses to the indoor radon concentration. Three passive houses and one low energy houses in Upper Austria where investigated. The air tightness was evaluated with the blower door test. The radon concentration was measured with 3 active devices in every measurement site. The measurements where performed from November 2009 to January 2010.

During the measurement period the ventilation system was shut of for several times. The maximum values without the ventilations system where 3-4 times higher than the mean values. The maximums values where measured, when the ventilation system was shut off. This indicates that the use of the ventilations system has a positive effect to the reduction of indoor radon concentration.

Research program