Villa in Riehen

The planned remodelling of the villa in Riehen required an investigation into its possible radon potential in advance. Radon, a naturally occurring radioactive noble gas, can penetrate buildings through the ground and pose health risks at high concentrations, in particular an increased risk of lung cancer. Against this background, Gruner AG was commissioned to carry out a short-term radon measurement in accordance with the specifications of the Federal Office of Public Health (FOPH).

The initial measurements showed that there was a high probability that the legally stipulated reference value of 300 Bq/m³ would be exceeded. This insight made it necessary to take appropriate measures to protect against radon.

In order to develop effective restoration strategies, further test measurements were initiated. Six high-resolution and officially recognised radon measuring devices, known as RadonMappers, were used. These devices enabled precise monitoring of radon concentrations in various areas of the building over a specific period of time.

A crucial aspect of the investigation was the localisation of the exact entry points of the radon using the "sniffer mode". This method is particularly useful for increasing the efficiency of the restoration.

Various restoration attempts were carried out simultaneously with the investigations. Ventilators were temporarily installed to create a depression in the building. This was monitored by continuous differential pressure measurements. Some provisional sealing measures were also taken.

Once the measurements and tests had been completed, a detailed measurement report was issued with a data analysis of the short-term measurements.

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