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Situations That Can Complicate the Typical Radon System Installation

If there is concern about any of these items, please let us know during the initial consultation. If you believe your home may present possible obstructions for pipe placement and run, it is recommended that you allow us to preview the home in advance of the installation.

  • 100% Completely Finished Basements
  • Slab homes without unfinished areas along perimeter homes
  • Homes surrounded by decks and attached finished exterior entertainment areas.
  • Homes with greater than 2000 square feet on the lowest level.
  • Homes with room additions built after the initial construction.
  • Older homes that have had a new basement slab poured.
  • Homes with more than one level of slab, example: tri-level homes.
  • Homes with a crawl space
  • Homes with Heating and Air conditions ducts under the house
  • Radiant heat pipes in the floor
radiant heat pipes in floor radiant heat pipes in kitchen floor

Radiant heat pipes are laid in the concrete slab and should be located with thermal imaging before cutting into the floor.

sump pump in closet sump pump in floor

Hidden Sump pit locations - we need to address all sump pits, if it's hidden please let us know.


Crawl space before


Crawl space after

Crawl spaces may need to become part of the mitigation system, either by circulating, venting or vacuuming air to change the pressure relationship within the space. Many crawl spaces will benefit from sealing with a polyurethane mat and creating vacuum under the mat.

radon grate plumbing penetration

Some window wells, floor grates and floor drains empty directly into drain tile. An ASD radon system will draw air from any opening in the slab area. Plumbing rough ins need to be concreted in and all other opening addressed.

weeping wall weeping wall radon
large crack in foundation large crack in foundation

Open trenches, water proofing systems, numerous large floor cracks around the interior perimeter walls of the home may need to be addressed. Some drain systems include a plastic barrier that separates the wall from the floor. The open space between the plastic and the wall is to catch water from potential wall leaks. If unaddressed these open air channels could lead to the reduction of static pressure under the slab, loss of conditioned air and possible back drafting of combustion appliances, i.e. furnace.

Water problems in the basement or high water tables. High water tables under a basement slab may impede the ability of the radon system to draw air from under the slab. Likewise if the water table is too high, and shuts off air flow completely, it could damage the radon fan.

radon mitigation garage piping radon removal

Custom pipe runs may be necessary if the home does not have a reasonable path from the lowest level to above the roof. Examples include garage attic installations without a garage access scuttle, or three car garages with living space above two garage bays. If the system installation starts to look like a hot wheel track, or it involves more than light duty carpentry, it falls into this category.


The first step to help ensure the safety of you and your family’s health and safety is to have your home tested for radon. At St. Louis Radon, our professional testers deploy the latest in computerized electronic real-time radon monitoring technology to provide you with a comprehensive report, including a complete visual graph of radon level data points as recorded over a 48-hour sampling period.

Learn More About Testing


If testing indicates levels of radon that require action, our team of engineers and technicians will design and install a custom radon mitigation system to safely and effectively redirect radon and other soil gasses out of your home. We also take additional measures to seal and close other possible breaches in the foundation that could let soil gasses into the through cracks or drain tiles systems.

Learn More About Mitigation

New Construction

With new home construction projects, it is crucial to determine the level of radon that may be present in the soil before the home is built. It’s also critical to have the new home retested for potential radon concentrations immediately following occupancy. We also highly recommend installing an Active Dampness Control System (ADC) with every new build.

Learn More About New Construction