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Construction and protective measures against radon


Buildings must be implemented in such a way that the lowest possible concentration of radon in indoor air is achieved (ALARA). High levels of radon are considered a construction defect, and they are a considerable risk factor for developing lung cancer.


Radon must always be factored in during the construction and renovation of buildings

The chosen site of a building and its structural solutions play a key role in terms of future residents’ and facility users’ potential exposure to radon. Even in areas with radon-safe soil, a deep layer of gravel under the foundations of a building may cause the radon levels in indoor air to exceed the threshold value. Applying radon-safe structural solutions is always safer than just testing the soil of the construction site for radon. Appropriate planning and measures against radon are necessary for construction throughout Finland. It is always possible to construct a radon-safe building in a high-risk radon zone or on landfill. Structural designers must always present site-specific structural solutions for radon safety.

The foundations of a building also affect the levels of radon in indoor air. The most common type of foundation in Finland is a ground slab, and it always requires additional measures to prevent radon from entering the building. Such measures include the appropriate sealing of the foundations, installation of radon breaks and radon piping installed in the capillary break of the floor. Correctly implemented, a radon piping system can also be connected to a radon extractor fan to boost the extraction of radon. The power of the extractor fan must always be adjusted upon implementation, using the appropriate gauges.

A self-ventilating base floor is typically a radon-safe solution, but not the only one.

In the high-risk zones, poorly implemented protective measures typically result in levels of radon exceeding the threshold values. New buildings should be tested for radon during the winter following the their completion.

Click HERE to easily book a radon analysis for your home.

Regulations concerning radon in construction:

The average annual radon concentration in buildings constructed after 1 April 2004 may not exceed 200Bq/m3. Exceeding the annual average is considered a construction defect, and actions must be taken to reduce the amount of radon.


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