The Importance of Radon-Resistant Features in New Homes

Real Estate Agent with RE/MAX 4000

Did Your Builder Install Radon-Resistant Features in Your New Home?

What is Radon ?

Radon-resistant features new home

Radon is a radioactive gas that has been found in homes all over the Unites States.  It comes from the natural breakdown of uranium in soil, rock and water and gets into the air you breathe.  Radon typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation.  Radon can also enter your home through well water.  Your home can trap radon inside.

Any home can have a radon problem.  This means new and old homes, well-sealed and drafty homes, and homes with or without basements.  In fact, you and your family are most likely to get your greatest radiation exposure at home.  That is where you spend most of your time.

My Home Has Radon-Resistant Features and I Had it Tested

Since I am always advising my clients about Radon and that they should do a Radon test, I decided to take my own advice.

My home is 2 1/2 years old and was built by a well-known builder in the area.   One of the quality of construction features installed in the home is "Radon-Resistant Features (Techniques)".  I was curious to know if that actually makes a difference?

I called Ryan Goodsell, of Circle G Inspections to perform the test.  Ryan uses the "Active Device" for testing and it was continuous monitoring from Friday evening to Monday evening.  The test results came in at an average of  1.1 pCi/L.  Ryan said it was the lowest level he has ever seen in a home that did not have a Radon Mitigation system installed.  A Radon Mitigation system is installed when a home has high levels (over 4.0) of Radon.  The test results confirm that I made a good choice when selecting my new home!


Radon In Mesa County

The average national indoor radon level is 1.3 pCi/L. (What is a picocurie?)
The basis for the curie is the radioactivity of one gram of radium. Radium decays at a rate of about 2.2 trillion disintegrations (2.2x1012) per minute. A picocurie is one trillionth of a curie. Thus, a picocurie (abbreviated as pCi) represents 2.2 disintegrations per minute.

The average indoor radon levels of Mesa County, as determined by radon test results from Air Chek, Inc, is 4.6 pCi/L

Radon Risk chart for Mesa County    Results under 2 pCi/L


 Results between 2 and 3.9 pCi/L

 Results 4 pCi/L and above

Radon Resources


What Are Radon-Resistant Features?

Radon-resistant techniques (features) may vary for different foundations and site requirements.  If you are having a home built, ask your builder if they are using a recognized approach (International Residential Code, Appendix F, ASTM E 1465-08, and ANSI/A/AARST RRNC 2.0 as examples.  If your new house was built (or will be built) to radon-resistant, it will include these basic elements:

  • Gas-Permeable Layer:  This layer is placed beneath the s lab or flooring system to allow the soil gas to move freely underneath the house.  This gas-permeable layer is used only in homes with basement and slab-on-grade foundations, it is not used in homes with crawlspace foundations.
  • Plastic Sheeting:  Plastic sheeting is placed on top of the gas-permeable layer and under the slab to help prevent the soil gas from entering the home.  In crawl spaces, the sheeting (with all seams sealed) is placed directly over the crawl space floor.
  • Sealing and Caulking:  All below-grade openings in the foundation and walls are sealed to reduce soil gas entry into the home.
  • Vent Pipe:  a 3- or 4-inch PVC pipe (or other gas-tight pipe) runs from the gas-permeable layer through the house to the roof, to safely vent radon and other soil gases to the outside.
  • Junction Boxes:  An electrical junction box is installed in case an electric venting fan is needed later.

Are you relocating to the Grand Valley area and would like more information? Are you wanting to buy or sell a home?  Please give me a call or drop me a note!

Posted by

Sandra Mathewson


RE/MAX 4000 Inc.

call or text (970) 261-1686

I am Sandra Mathewson, a full-time Realtor working both as a listing agent and a buyer's agent. I love using the internet to meet people and keep in touch with friends and clients. I write this blog to show you why Grand Junction, Fruita, Palisade and surrounding real estate is truly something to be desired.

Visit my website if you are considering buying or selling. You will find it as your best online source of information. How is the market doing? I'll keep you posted with the most current MLS reports. You can also search for homes for sale in Grand Junction (including Fruita, Palisade and surrounding areas). Read about the communities, events and things to do in this great Grand Junction, Colorado Lifestyle.


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Will Hamm
Hamm Homes - Aurora, CO
"Where There's a Will, There's a Way!"

Hello Sandra,  you wrote a great blog about radon.  I have seen some levels on the front range being as high as 39.0


Nov 17, 2018 07:05 AM #1
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