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Radon mitigation in basements

In radon-risk areas basements can be found to contain particularly high concentrations of radon. This is because radon gas is heavier than air and will therefore have a tendency to accumulate at the lowest level of a building.

In some cases, the basement tanking system will provide adequate protection against the ingress of radon. However, where a radon measurement reveals levels of radon above the recommended action level, remedial measures will usually be required. The BRE identify six main methods of reducing the amount of radon entering a house with a cellar or basement. [1]

  • Installing a radon sump system
  • Sealing floors and walls
  • Increasing underfloor ventilation
  • Installing whole house positive pressurisation or positive supply ventilation system
  • Improving ventilation of the house
  • Improving ventilation of the cellar or basement
Basement Radon Mitigation System

Figure 1: Sump pump radon mitigation system

A simple way of combining the first three of these methods is to install a cavity drainage system such as Oldroyd Xv Clear connected to a modified sump system designed to pump both water and radon away from the basement. An example of such a radon mitigation system is shown in Figure 1.

[1] BR343 “Dwellings with cellars and basements: a BRE guide to radon remedial measures in existing dwellings” CR Scivyer and MPR Jaggs.

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