The Building Regulations, BR10, contain tightened requirements on indoor climate. As a consequence buildings must be constructed in such a way that the radon concentration inside a building does not exceed 100 Bq/m3. The tightened requirements are tuned to recommendations from WHO.
The present guidelines contain directions concerning ways of constructing the building envelope facing the ground securing airtightness against soil gas penetration. The guidelines also account for the relationship between radon penetration, radon concentration in indoor air and energy consumption.
A number of illustrations show how to construct the building envelope facing the ground and how to establish seals against the ingress of soil gases in a number of selected building components. It is also demonstrated how the airtight shell against the ground is connected to the airtight shell above ground level.
The guidelines are closely connected to SBi-Guidelines 232, Radon – Sources and measuring which account for the radon problem and demonstrates methods for measuring the radon level in buildings.
The guidelines are targeted towards clients, designers and certain trades involved in the construction of a building.