Radon Mitigation | Radon Testing | Radon Remediation & Reduction | Air Quality ControlRadon LinksStudies Exposure-Effect|Lung Cancer Risk Research Study|Evidence Proof of Health ImpactHow To Install Radon Mitigation SystemTestimonialsRadon Mitigation Article 2011: Radon RemediationWater SystemsLocations

Radon Information Center

Radon Mitigation (Reduction of Radon Gas):

Indoor radon can be mitigated by sealing basement foundations, water drainage, or by sub-slab de-pressurization. In severe cases, mitigation can use air pipes and fans to exhaust sub-slab air to the outside. Indoor ventilation systems are more effective, but exterior ventilation can be cost-effective in some cases. Modern construction that conserves energy by making homes air tight exacerbates the risks of radon exposure if radon is present in the home. Older homes with more porous construction are more likely to vent radon naturally. Ventilation systems can be combined with a heat exchanger to recover energy in the process of exchanging air with the outside. Homes built on a crawl space can benefit from a radon collector installed under a radon barrier (a sheet of plastic that covers the crawl space).

The most common approaches are active soil depressurization (ASD) and mechanical ventilation (MV). Experience has shown that neither is applicable to all buildings with radon problems. A less common approach works efficiently by reducing air pressures within cavities of exterior and demising walls where radon emitting from building materials, most often concrete blocks, collects.

  • Nearly all mechanical ventilation-based radon control systems are of fixed rate operation, and even if the indoor relative humidity in the interior of a building goes high, they will continue to inject moisture-laden air into this wet environment increasing the likelihood of mold growth. This is especially risky in hot, humid climates. It is not an unusual practice for radon mitigators in hot, humid climates to warn of possible resulting mold problems by way of an easily removed warning sticker.
  • Above Slab Air Pressure Differential Barrier technology ASAPDB requires that the interior pressure envelope, most often drywall, as well as all ductwork for air conditioning systems, be made as airtight as possible. A small blower, often no more than 15 cubic feet per minute may then extract the radon-laden air from these cavities and exhaust it to the out of doors. With well-sealed HVAC ducts, very small negative pressures, perhaps as little as 0.5 pascal, will prevent the entry of highly radon-laden wall cavity air from entering into the breathing zone. Such ASAPDB technology is often the best radon mitigation choice for high rise condominiums as it does not increase indoor humidity loads in hot humid climates, and it can also work well to prevent mold growth in exterior walls in heating climates.
  • In hot, humid climates, heat recovery ventilators HRV as well as energy recovery ventilators ERV have a record of increasing indoor relative humidity and increased dehumidification demands on air conditioning systems. In some cases, it is not unlikely that serious mold problems have an origin in HRV and ERV operation in hot, humid climates. HRVs and ERVs have an excellent record in heating climates.
  • A recently revealed technology is based in building science. It includes a variable rate mechanical ventilation system that prevents indoor relative humidity from rising above a preset level such as 50% which is currently suggested by the USEPA and others as an upper limit for the prevention of mold. It appears to be especially promising for radon mitigation in hot, humid climates.
  • It is generally assumed that air conditioner operation will remove excess moisture from the air in the breathing zone. Just because you have cooling does not mean that you have dehumidification.
  • Factors that are likely to aggravate indoor humidity problems from mechanical ventilation-based radon installations are as follows and an expert radon mitigator/building scientist will check for and correct any and all of the following when he performs his radon mitigation procedure:

1. Air conditioner duct leaks located outside the breathing zone, such as in the attic. 2. Excessive exhaust fan operation 3. Oversize or over-capacity air conditioners 4. AC air handler fans that do not stop running when the air conditioner compressor stops running. 5. A radon system air intake located close to a clothes dryer exhaust. 6. delta t, which is the number of degrees that the air is cooled as it is passed over the air conditioner's cooling coils. A good delta t performance figure for home air conditioners is about 20 degrees Fahrenheit. In comparison, automobile air conditioners deliver delta t performance of 32-38 degrees F. A delta t of 14 degrees will dehumidify poorly if at all.

In South Florida, most all radon mitigation is performed by use of fixed rate mechanical ventilation. Radon mitigation training in Florida does not include any segment addressing mechanical ventilation or of problems associated with mechanical ventilation systems such as high indoor humidity, mold, moldy odors, property damage or health consequences of human occupation in high humidity of moldy environments. As a result, most Florida radon mitigators are unaware of and do not incorporate existing building science moisture management technology into mechanical ventilation radon installations.

^ "Recommended Residential Radon Mitigation Standard of Practice". United States Environmental Protection Agency. Retrieved on 2008-02-02.

  1. ^ "ASTM E2121-03 Standard Practice for Installing Radon Mitigation Systems in Existing Low-Rise Residential Buildings". ASTM International. Retrieved on 2008-02-02.
  2. ^ "Residential Measurement Provider". The National Environmental Health Association -- National Radon Proficiency Program. Retrieved on 2008-02-02.
  3. ^ "Radon Measurement Method Definitions". The National Environmental Health Association -- National Radon Proficiency Program. Retrieved on 2008-02-02.
  4. ^ "You've found radon in your home - what should you do?". Air Chek, Inc.. Retrieved on 2008-02-02.
  5. ^ "National Radon Proficiency Program". The National Environmental Health Association -- National Radon Proficiency Program. Retrieved on 2008-02-02.
  6. ^ "Residential Mitigation Provider". The National Environmental Health Association -- National Radon Proficiency Program. Retrieved on 2008-02-02.
  7. ^ "Radon Mitigation Methods". Radon Solution -- Raising Radon Awareness. Retrieved on 2008-12-02.

ABOUT RADON GAS:

Radon is a colorless, odorless, naturally occurring, radioactive noble gas that is formed from the decay of radium. It is one of the heaviest substances that remains a gas under normal conditions and is considered to be a health hazard. The most stable isotope, 222Rn, has a half-life of 3.8 days and is used in radiotherapy. While having been less studied by chemists due to its radioactivity, there are a few known compounds of this generally unreactive element.

Radon is a significant contaminant that affects indoor air quality worldwide. Radon gas from natural sources can accumulate in buildings, especially in confined areas such as the basement. Radon can be found in some spring waters and hot springs.

According to the United States Environmental Protection Agency, radon is reportedly the second most frequent cause of lung cancer, after cigarette smoking; and radon-induced lung cancer the 6th leading cause of cancer death overall. According to the same sources, radon reportedly causes 21,000 lung cancer deaths per year in the United States.

More Radon Mitigation Links for 2010

Mitigation Systems for Radon Gas  Radon Abatement  Radon Mitigation  Radon Gas Mitigation  Radon Remediation Systems  Radon Mitigation System  Radon Reduction  Radon Removal System  Radon Systems  Mitigate Radon  Radon Mitigation Company  Remove Radon Gas  Radon Abatement  Radon Mitigation Contractor  Radon Mitigation Information  Mitigation of Radon  Radon Gas Causes Cancer  International Radon Mitigation Project  Radon Ventilation  Radon Engineer Mitigate  Radon  Reduce Levels of Radon Gas  Radon Removal  Radon Testing and Mitigation  Radon Mitigation Cost  Radon Mitigation Installation  Radon Gas Radon Mitigation Systems  Pennsylvania Radon Mitigation  Radon Remediation Collegeville PA  Radon Mitigation Denver Colorado  Radon Mitigation Information  Radon Gas, Lung Cancer, Radon Mitigation  Radon Remediation Radon Gas Mitigation  Radon Mitigation Specialist  National Radon Action Month  Slate: Radon Mitigation  Radon Testing / Radon Remediation  Lung Cancer is Caused by Radon  Mitigation Systems to Reduce Radon Levels  Ann Arbor Radon  Indianapolis Radon Mitigation  Remediation of Radon Gas  Radon Systems Philadelphia PA  Norristown PA Radon Testing  Radon Denver Colorado Denver Radon Mitigation  Colorado Radon Abatement  Connecticut Radon Mitigation  Commercial Radon Vapor VOC Mitigation Systems  Radon System for Mitigation of Gas  Radon Testing and Radon Reduction Services  Radon Links  Contact Radon Mitigation Services  EPA Radon Guide  Radon Mitigation Links  Radon Action Level 2.7, Radon Limit 2.7Information About Radon Testing  Garage Attic Radon Removal System Video  Radon Mitigation: Information and New About Radon Gas  Radon Monitor for Radon Testing  Radon Gas Website and Mitigation Blog  Comments: Radon Mitigation  Blog: Radon Mitigation Radon Remediation  Pittsburgh PA Radon Contractor  Radon New York  New York Radon Mitigation NY  Maryland Radon Reduction  Radon Testing & Mitigation Indianapolis  Indianapolis Radon Abatement Services  Indiana Radon Reduction  Easton Pennsylvania Radon Removal  Radon Removal Services Aston Macungie PA  New York Times Radon Article  Maryland Radon Mitigation  Radon Mitigation on Popular Science  Radon Remediation on Slate: Radon Gas Mitigation  Ventilation of Radon Gas  Mitigation on Radon Systems  PA Radon Reduction, Pennsylvania Remediation  Soil Vapor Extraction Systems  Radon Reduction, Radon Abatement  Install Radon System  Radon Companies in Colorado  The #2 Cause of Lung Cancer: Radon Gas  Denver Colorado Radon Abatement CO  Radon Systems for Large Buildings  Radon Information Denver Colorado Mitigation  Remediation of Radon, Mitigation of Radon  Install Radon Systems  Radon Articles About Mitigation  Important Radon Abatement Links  Radon Environmental of Indianapolis  Videos About Radon Remediation  Ground Contamination, VOC Extraction  United States Mitigation of Radon  Radon  How Radon Systems Work  New York Radon  Reading Allentown Radon Services  Radon Reduction System Video  Radon Mitigation in Denver  Radon Gas Video  Radon Remediation  Air Quality Control, Radon  Press Release: Radon Action Level 2.7Active Soil Depressurization Photos  Radon Installation Video  Colorado Radon Denver Mitigation  N.Y. Radon Removal New York  Radon Mitigation Denver CO  Lower Radon Action Level WHO EPA  MD Radon Mitigation Columbia Maryland  Colorado Radon Information, Denver  Radon Testing  Abatement of Radon Gas  Maps: Colorado Radon Map  Press Release: Radon Gas Kills 20,000 Americans  Denver CO Radon Removal Services  New York Radon Mitigation Contractor  Radon Mitigation on Popular Science  John Talty, Radon Mitigation  Maryland Radon Reduction and Testing  Radon Companies in Denver Colorado  Radon Mitigation Systems  Littleton Colorado Radon  Phoenixville Lancaster PA Radon Mitigation  Radon Causes More Deaths Than Carbon Monoxide  Denver Radon Mitigation  Radon Abatement Services  Hotline: Denver Radon Mitigation  Hartford Norwalk Stamford Connecticut Radon CT  Accredited Radon Mitigation PA  Air Quality Control: Radon Mitigation Denver CO  Radon Mitigation, Radon Remediation, Radon Abatement  Radon Remediation Denver Colorado  Removal of Radon Gas  Radon Gas Mitigation Information  Radon Reduction Pennsylvania Remediation  Lower Radon Levels  Colorado Radon Removal Longmont CO  Mitigate Radon Pittsburgh PA, Radon Pennsylvania  Denver Radon Colorado Mitigation  Testing For Radon Gas  Pittsburgh Radon Mitigation PA  Havertown PA Radon Reduction Philadelphia  Collegeville PA Radon Remediation  World Health Organization Radon Limit  Radon Mitigation Baltimore Maryland MDPA Radon Removal Systems Pennsylvania  Indianapolis Radon Reduction and Radon Testing  Radon Remediation Lansdale Pennsylvania  Connecticut Radon Mitigation Radon Remediation CT  Radon Systems of Indianapolis Indiana  Radon Removal, Mitigate Radon Gas  Radon Abatement  Radon Mitigation Contractors, Radon Testing  Remediate Radon Problem  Radon Reduction Radon Testing  Radiation and Radon Gas Mitigation  Radon Mitigation