vapor intrusion home 2

Radon vapor travels through the soil and into homes

Radon gas in the United States is the number two cause of lung cancer and the number one cause of lung cancer  in non-smokers according to the US EPA, UN World Health Organization and University of Illinois. [1] [2]  Nelson Radon Reduction provides professional radon mitigation services to meet the needs of home owners, real estate professionals, professional builders, schools and commercial building owners.


Why we have a radon problem

Radon gas is a naturally produced gas formed from the decay of Uranium and Radium.  These minerals are in rocks that are part of our soils structure primarily from glacial till. [3] Radon gas enters homes through cracks, construction joints, utility line penetrations and open earth areas.  Homes naturally have a lower internal pressure than the gasses in the ground.  This draws ground gasses into the home.  The lower pressure is due to appliances that move air to the outside of the home like:  clothes dryers, bathroom vents, stove vents, whole house fans, central vac systems, furnaces and natural stack effect(air naturally moves up through homes) To understand why radon gas enters a home and what a radon mitigation system does is important in considering the type of system to install.

How we help home owners protect their families health

The primary type of systems used are:  sub-slab depressurization, sub-membrane depressurization and positive pressure using Energy Recovery Ventilation (ERV) systems (more often in commercial buildings and schools where a large volume of air is used).  Sub-slab and sub-membrane depressurization is the method most commonly used to reduce radon levels.  This is a fairly low cost and very effective method.  The general concept is to extend a negative pressure field under the basement slab or the gas membrane installed in a crawlspace to reduce the ground gas pressure compared with the pressure in the home.  This is accomplished by installing a piping system, with an inline radon vacuum fan that penetrates the slab or membrane and creates the negative pressure field and vents the radon gas into the outside air where it dissipates.

Radon Reduction Systems

The Nelson Radon team makes homes safer by reducing radon below the state action level of 4 pCi/L. This includes difficult and complex installations as well as homes built with modern construction techniques.  Many homes can have radon levels reduced below 2 pCi/L.  Radon will never be reduced to Zero because outside air can have levels of .3 pCi/L to 1.2 pCi/L depending on the area.  Most areas in Central Illinois will have an outside air reading of between .3 pCi/L to .6 pCi/L.  In Central Illinois 2 out of 3 homes will be over 4 pCi/L with the balance testing between 2 pCi/L and 3.9 pCi/L. Radon Mitigation is a practice developed and used worldwide to reduce the health risk of exposure to radioactive partials caused when radon gas breaks down. For more information about Radon Mitigation in homes, schools and commercial buildings contact us at:  jnelson@nelsonradon.com


For additional  information about radon visit the following links:

[1]  US EPA Health Risks       http://www.epa.gov/radon/healthrisks.html

[2] University of Illinois      http://takeactiononradon.illinois.edu/

[3] USGS Radon Source        http://energy.cr.usgs.gov/radon/georadon/3.html

US EPA and Radon link:        http://www.epa.gov/radon/

US EPA Radon Guide:          http://www.epa.gov/radon/pubs/citguide.html

USGS radon link:                    http://energy.cr.usgs.gov/radon/georadon.html

USGS radon geology link:     http://energy.cr.usgs.gov/radon/georadon/3.html

University of Iowa:              http://www.cheec.uiowa.edu/misc/radon.html

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