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Radon Membrane

Radon Membrane can be used in most common floor constructions. It is installed in a similar way to a damp proof membrane, but with much greater attention paid to workmanship and detailing in order to achieve effective sealing at all locations.

Once you have determined whether you need “basic” or “full” protection, you must check that your preferred ground floor construction gives you the right level of protection. The options are as follows: Basic Radon Protection For “basic” protection, you need to provide an airtight barrier covering the entire ground floor of the building, linked to the damp proof course using cavity trays which prevent radon moving through the wall cavity and into the building. All junctions between the floor membrane and cavity trays should be sealed. You can achieve “basic” protection with both ground supported and suspended(ventilated) concrete ground floors by installing a radon-proof membrane system. With a suspended concrete slab, the space beneath the floor is available to ventilate radon safely away should “full” protection be required.

You not only need to provide a radon-proof floor membrane, but also an underfloor depressurization system. Depressurization can be achieved by natural or mechanical underfloor ventilation through the sub-floor space, or from a radon sump if there is no underfloor space. If you prefer to use an in sit slab in contact with the ground, the slab should be supported on the inner leaf. The full system consists of:

  • Radon Jointing System, prevents radon ingress at joints
  • Top Hat Units prevents radon ingress at pipe penetrations
  • Radon Sumps, where sub floor depressurization may be required


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