Radon Reduction Solutions
(also know as Radon Remediation or Radon Mitigation)
Radon reduction solutions for your home or your Workplace are achieved by a number of different methods or techniques as outlined below.

When you get the result of your Radon test from Radon Testing.ie, it will be given in Becquerel’s per cubic metre (Bq/m3). The level at which you should consider Radon reduction methods is 200(Bq/m3) for your Home and 400 (Bq/m3) for your Workplace. These levels should not to be taken to be the threshold at which the Radon level is considered safe or not. A lifetime exposure to radon in the home at the National Reference Level of 200 Bq/m3 carries a Low risk of about 1 in 50 (2%) of contracting fatal lung cancer (Average for smokers and non-smokers together).

Actions Required
Your Home

  • Level below 200 (Bq/m3) - generally no action required.
  • Levels above 200 (Bq/m3) - you should carry out Radon reduction solutions. Radon Testing.ie offer advice on the most suitable solution for your home and budget. Please contact us to discuss your options. We can call to your Home to discuss these options.
Your Workplace

  • Levels below 400 (Bq/m3) - in all of the different areas of the building tested- no action required.
  • Levels above 400 (Bq/m3) - in any one of the areas of the building tested - the Employer Must protect the health of Workers and have Radon reduction carried out. Radon Testing.ie offer advice to Employers on the most suitable and cost effective solutions for the Workplace. Please contact us to discuss your options. We are happy to visit your Workplace to review these options and carry out an on site survey.

Solutions
There are number of methods used to reduce Radon levels in your Home or Workplace. They either stop the Radon gas from entering or remove it from the building. All of these methods work to varying degrees.

  • For levels up to 300 (Bq/m3) -all methods are likely to reduce the Radon levels to below the National Reference Level of 200 (Bq/m3).

  • For levels up to 800 (Bq/m3 ) -there are a number of methods that are likely to succeed.

  • For levels above 800 (Bq/m3) - the method that is most likely to be successful is installation of an active sump (Form sump under the floor of the building externally and fit a small fan to remove the Radon gas). This is the preferred Radon solution because the likelihood of success is greater.

The main methods of Radon reduction are as follows:
(The level of Radon up to which each method is likely to succeed is given in Bq/m3)

  • The radon sump (sub-floor depressurisation) Preferred Method
    Active system [ 2000 and above (Bq/m3 )]
    Passive system [ 400 (Bq/m3 )]
    • Buildings Constructed after July 1998
      Under the 1997 Building Regulations (Technical Guidance Document (TGD) – C) all new buildings constructed after July 1998 should have Radon protection measures installed.

      > In High Radon Areas, a Radon barrier membrane and standby sump with pipework terminating in the footpath should have been installed.

      Radon Testing.ie recommends that all newer Buildings constructed in High Radon Areas after July 1998 be tested. There is no guarantee that radon concentrations will be below the recommended level as it is extremely difficult to achieve an 100% gas tight Radon barrier under building site conditions. If the levels of Radon are found to be high then standby Radon sump can be activated (passive or active).

      > In areas other than High Radon Areas, a standby sump with pipework should have been installed (Areas shown on Radon Map).

      Radon Testing.ie recommends that all newer buildings constructed in areas other than High Radon Areas after July 1998 be tested, as there is no guarantee that radon concentrations will be below the recommended level (High readings have been recorded in these areas). If the levels of Radon are found to be high then standby Radon sump can be activated (passive or active). 

      Buildings Constructed before July 1998
      These buildings would not have Radon protection measures installed and Radon Testing.ie advise that these buildings should be tested. If the levels of Radon are found to be high then a Radon sump can be installed.

      The sump can be formed either internally or externally in the building. There is less disruption with the external method. A bucket size space is formed under the ground floor of the building in the hardcore fill. Then a duct pipe is fitted to the sump and seal. This pipe run either internally in the building exiting through the roof or externally fixed to a wall rising above the eaves.

      • The sump and pipe can be used as a passive system (The system uses the stack effect to draw the Radon from under the building). It may be suitable for levels up to 400(Bq/m3). Following a re-test if the levels were found to be still high, a fan can be fitted. It then becomes an active system.

      • When a small electric fan is fitted to the sump it is called an active system. This is the preferred method and gives the most effective solution for the removal of the Radon risk. It has been found to be effective for levels of above 2000 (Bq/m3).It is recommended that a sump be installed for every 250m2 of ground floor area. Sumps can be linked to a single Fan.

      Sump Pump

  • Sealing floors and walls [ 350 (Bq/m3 )]
    As the Radon enters buildings through cracks in floors, walls and around service pipes/wires etc it is possible the stop the Radon gas from getting into the building by sealing these cracks etc. in theory. However in practice it is very difficult to achieve this. It involves having to remove fitted furniture, skirting and floor coverings to access these cracks and there is no guarantee that all cracks can be found or that new cracks will not develop.
    Radon Testing.ie can check your building for major gaps and seal them in conjunction with other methods.

  • Increasing indoor ventilation [ 350 (Bq/m3 )]
    This is achieved by unblocking existing air vents and providing additional wall vents. When the air from outdoors mixes with the indoor air which contains the Radon, the concentration of Radon is reduced. Also the effect of the difference in air pressure between inside and out that sucks Radon into a building is reduced. The problem with this method is that people tend to block air vents at certain times of the year to prevent drafts and more house are now being sealed to prevent Heat loss.

  • Increasing under-floor ventilation [ 700 (Bq/m3 )]
    This is suitable in buildings that have an under floor void (vented dead space under a timber floor). This would tend to be older buildings as most modern buildings would not use this type of construction. In old buildings the vent brick may need to be replaced or a Fan fitted to draw the Radon from the void.

  • Positive pressurisation [ 900 (Bq/m3 )]
    Radon is drawn in to a building from the ground (through small cracks in floors, walls and service entry points etc) because of the difference in air pressure between the warmer internal less dense air and the external air. Therefore by pressurising the internal air within a building you can reduce the effect of Radon being sucked into the building. This method is achieved by installing a fan in the attic and a network of pipes to each room with a vent in each ceiling. A small heater would also be required to remove chill from the air in the winter. The running costs are likely to be higher than sub-floor depressurisation.

Radon Testing.ie welcome your calls or emails and are happy to advise on the best solution for you and your Home or Workplace.

Reduce the Risk from Radon in your Home and Workplace contact us.