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Radon Gas

  1. What is radon gas?

Radon is a colourless, odourless radioactive gas. You cannot feel it, smell it, or see it; you can only detect it using very sophisticated scientific equipment.

  1. Where does radon come from?

Radon is formed in rocks where uranium and radium are present - particularly granite.  The gas seeps through cracks in the rocks and soil and normally disperses into the atmosphere.

  1. Where is radon found?

Radon is found in all parts of Northern Ireland.  To find out if radon is in your area click here

  1. What effect does radon have?

Where buildings are constructed above certain types of ground, radon can percolate up through the rock, collect and build up within the building to a level, which could be a risk to health.  Radon is considered to be a major source of radiation, exposure to this radiation is known to cause cancer and inhalation of radio-active gas significantly increases the risk of lung cancer.

  1. How can you protect against radon?

The best way to avoid the effects of radon is to take measures to prevent the gas from entering your house.  The two most common means by which this can be done is:

Radon Membrane: Lay a sheet of material that the radon cannot pass through over the ground beneath the house. This can be an impermeable membrane, such as 1200 gauge polythene.  A membrane will reduce the radon level by approximately 50%.

If an impermeable membrane is to be effective, it is very important that there are no gaps at the edges, or where service pipes enter the house.  Measures should be taken to ensure the membrane is not ruptured should the floor slab settle.

Radon Sump: This is a void created beneath the house, with a pipe to the outside, to prevent the radon getting into the dwelling. A sump will reduce the radon level by approximately 90%, if fitted with a continuous running fan.  Under the current regulations there is no requirement to fit the fan, but it enables the homeowner to initiate sub floor de-pressurisation in the future, if it is discovered that the radon level in the dwelling is high.

If you need any further information on radon gas, please telephone 0330 137 4003 and speak to the Building Control Surveyor for your area.

Further advice on dealing with radon can be found on the BRE website: