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Radon Mitigation Systems: What Are They and Why Do They Matter?

Radon Mitigation Systems: What Are They and Why Do They Matter?

If you’re buying a home, consider getting a radon mitigation system. After all, radon is an odorless and colorless gas that can lead to cancer and other health issues. Read on to learn how a radon mitigation system can keep you healthy.


Disclaimer: REthority is supported by ads and participation in affiliate programs. We may earn a commission when you click our links. The information included in this post is for informational purposes only and should not be taken as legal or financial advice.


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What Is Radon?

Radon is a radioactive gas that is a byproduct of the breakdown of radioactive elements in the ground, such as thorium and uranium. These elements are found naturally in rock, water, and soil.

What is Radon graphic including the RN symbol displayed on a laptop and an explanation of radon to the right

When these elements release radon, it can enter the home through cracks in the foundation and even well water. It’s then released into the air where unsuspecting homeowners can breathe it in, which can lead to serious health problems like cancer.

It can’t be seen or tasted, which is why it’s a good idea to regularly test your home. The EPA has found that one in every 15 houses has dangerously high levels of radon, so it’s worth the time and money to get your home (or potential home) tested.

How Radon Is Detected

Since radon isn’t something you can smell, taste, or detect with the naked eye, you have to test the environment around you to know if it’s present. There are two types of tests that can be done to detect radon:

  • Short-term testing uses devices such as charcoal canisters, alpha-track detectors, and continuous monitors to take readings in your home, which will need to be kept as air-tight as possible for the duration of the test.
  • Long-term testing is taken for longer than 90 days. It utilizes alpha-track and electret ion chamber detectors over that time to measure the daily fluctuation of radon in the home.

The Environmental Protection Agency says to follow these steps when testing your home or office for radon:

  1. Have a short-term test completed over the course of two to three days or up to 90 days. If it detects radon levels of four picocuries per liter (pCi/L) or higher, then a follow-up test is needed.
  2. Follow up the short-term test with a long-term test to ensure the levels were read correctly the first time or perform another short-term test.
  3. If you need to get results fast, then a second short-term test is your answer. If you’re in no hurry, then a long-term test will help to give you the best reading of your year-round radon average.

You can find these tests at most hardware stores to do yourself. Just make sure to follow the directions closely to help you get the most accurate result.

You can call in a professional to do the radon readings for you instead of using a DIY kit. This is recommended if you’re doing it as a part of a real estate transaction, either buying or selling.

A professional will be able to provide a more accurate measurement for you, which may be something required by a mortgage lender, so make sure you look into that.

You can find a list of approved and licensed companies through your state’s environmental services agencies. They’ll run you about $150 or more.

Are You in Danger?

As a featured image for a piece on Radon Mitigation Systems, How to protect your home from radon gas thanks to a polyethylene membrane barrier and areated crawl space - concept illustration with a cross section of a building

Francesco Scatena/Shutterstock

The truth of the matter is that radon is all around you and you’re probably breathing some in every day at a very low level. Radon tends to accumulate in places with inadequate ventilation.

Long-term exposure can lead to a variety of health issues but you likely won’t have any symptoms of the radon exposure itself, only symptoms of serious illnesses such as cancer that occur after a long period of exposure.

If Your Home Has High Levels

So, you did the radon test and the results came back high – what do you do now? You need to minimize the radon concentrations in your home and you can do that with a radon mitigation system.

The good news is that mitigating radon in your home with a radon mitigation system can be done without huge overhauls and without spending your children’s college fund.

Your first order of business should be to caulk any cracks or openings in your foundation to reduce the amount of radon seeping into your home. Then make a choice about how what kind of radon system your home needs.

Types of Radon Mitigation Systems

Our friends at Enduring Charm did a great job explaining the difference between the different types of systems (which we describe in detail below).

Active Sub-Slab Depressurization

Active sub-slab depressurization is a type of radon mitigation system that is mostly used on homes that have a basement on a gradient or a concrete slab basement.

It works well for these foundation types because radon has the tendency to accumulate under the concrete of the basement foundation, where small cracks can form and release the gas.

An active sub-slab system uses suction to help keep radon from building up and seeping into your home. It uses an electrical vent fan and monitoring system to pump radon out through a vent pipe that is installed between the gravel of the sub-slab.

The pipe extends all the way up above the roofline where the radon is released outside of your home. The fan has just enough power to suck the radon out and keep it from gathering underneath the slab.

Sub-Membrane Systems

This is a radon mitigation system that also uses suction to help you redirect radon out of your home. It’s a great system to use if your home has a crawlspace, especially if the floor of the crawlspace is dirt or gravel.

When this system is installed, a heavy plastic sheet is placed on top of the floor of the crawlspace. A channel is then created that will house a fan as well as a pipe that leads outside to flush the radon gas that builds up under the plastic sheeting out.

This is really similar to the sub-slab suction system except it’s collecting the radon gas under the sheet to flush it out instead of allowing it to build up underneath a concrete slab and be redirected.

Drain Tile Suction

If you live in a home with drain tile installed along the perimeter of the foundation, then you may be able to use this mitigation system. It applies suction to the tile, basically blowing the radon away from your home to the outside air.

Block Wall Suction

Homes with a hollow foundation, such as block walls, can utilize a soil suction system that is installed directly into the walls of the foundation. This helps to create negative pressure on the inside of the wall and vent out of the radon.

The downside to this type of system is that it’s effectiveness depends on the size of the home. Larger homes may need to use block wall suction together with another method to help get the radon levels down to an acceptable, healthier level.

Sump Hole Suction

If you have a home built on an on-grade slab with a sump hole for water drainage, then this mitigation system may be the best option for you. It is similar to the active sub-slab depressurization system except that it adds a watertight, airtight cap on your sump hole to help facilitate suction.

Passive Sub-Slab Depressurization

There is one more radon mitigation system that can be used if you’re worried about the potential of radon down the road: A passive suction radon mitigation system.

This type of system is usually installed when a house is being built. It doesn’t require an active trigger for proper ventilation, such as a vent fan, because it utilizes differing pressures in different rooms of the home.

This natural differential in pressure encourages air flow in a specific direction and a duct system is installed that takes advantage of the air flow to guide the radon out of the home.

Passive suction systems are only for homes that have very low levels of radon and can’t be installed, so they’re strictly a preventative measure you can take when building a home – but still good to know about!

Radon Mitigation System Costs

The cost of radon mitigation systems vary, especially since every home has different needs to be addressed in order to ensure the system functions correctly. Some of the factors that play into cost include:

  • The size of your house
  • Whether you have a slab-basement or crawlspace
  • If you want an internal or external radon mitigation system
  • If you need more than one suction point
  • The type of fan used to suction the radon out
  • Whether you have a sump pump

It’s a good idea to call on a licensed radon mitigation specialist to come out to your home and provide you with an accurate price quote.

Once Your System Is Installed

Once your radon mitigation system is installed make sure you check for these things:

  • A clearly labeled system – All radon mitigation systems need to be clearly labeled in order to avoid any changes to the system down the road that could disrupt it
  • Exhaust pipes far enough away – Any soil suction system that uses an exhaust pipe must vent above the roofline and be at least 10 feet off the ground and 10 feet away from any openings such as doors and windows that could let radon back into the home.
  • Placement of exhaust fans – Any exhaust fan that is part of your system shouldn’t be near a livable area. They should be outside or in places unoccupied in your home such as the basement.
  • A manometer must be installed – This is to alert you if the radon mitigation system stops working.
  • Do a follow-up test – After you install a radon mitigation system then you need to have a follow-up test done no sooner than 24 hours after the radon fan has been turned on and the test should last a minimum of 48 hours.

This will help to give you a proper reading of indoor radon levels and let you know your system is working as it should.

Should You Get a Radon Mitigation System?

Whether you’re in the market to buy or sell a home or you’ve lived in the same place for years, it’s not a bad idea to have radon testing done.

It’s better to know if you have a radon problem and take steps to reduce radon in your home than to live with dangerously high levels for years without taking action.

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