Wednesday, June 25, 2025 / by Trisha Davis
What is Radon?
Radon is a colorless, odorless, and tasteless radioactive gas. It is a naturally occurring byproduct of the decay of uranium, which is found in varying amounts in soil and rock. As uranium breaks down, it produces radon gas, which can migrate through the ground and enter the air. Radon is a noble gas and chemically inert, meaning it does not readily react with other substances.
The concern with radon arises because, when inhaled, it can break down further, releasing tiny radioactive particles. These particles can damage lung tissue and increase the risk of lung cancer. Radon is considered a significant health hazard, and elevated levels of radon in indoor air pose a potential risk to human health. Testing for radon levels in homes and other buildings is recommended, and if high levels are detected, mitigation measures can be taken to reduce exposure.
A radon mitigation system is a set of techniques and equipment designed to reduce indoor radon levels. It typically involves creating suction points, installing vent pipes with a radon-rated fan, sealing entry points, and, in some cases, encapsulating crawl spaces. The goal is to prevent radon gas from entering living spaces and expel it safely outdoors. Hiring a qualified professional to assess and install an appropriate system is crucial for its effectiveness. Regular testing and, if needed, mitigation are essential for minimizing health risks associated with radon exposure.
A radon mitigation system works by creating a pressure difference that prevents radon gas from entering indoor living spaces and directs it safely outdoors. The most common type of radon mitigation system is called Active Soil Depressurization (ASD). Here's an overview of how it works:
Suction Point Installation:
A hole is drilled into the soil beneath the foundation or a suction point is created in the basement or crawl space.
The suction point is connected to a pipe that extends through the building and leads to the outside.
Vent Pipe and Radon Fan:
The pipe, known as the vent pipe, runs from the suction point through the building to the roof or exterior.
A radon-rated fan is installed in the vent pipe to create suction and draw radon-laden soil gas away from the foundation.
Negative Pressure Zone:
The fan creates a negative pressure zone beneath the foundation, preventing radon from entering the home.
This negative pressure encourages radon to flow towards the suction point and be vented outside.
Sealing Entry Points:
Gaps and cracks in the foundation are sealed to minimize the entry of radon gas.
Venting Radon Outdoors:
The vent pipe extends above the roofline or is directed away from windows to ensure that expelled radon dissipates harmlessly into the outdoor air.
Continuous Monitoring (Optional):
Some systems include continuous radon monitoring devices to ensure ongoing effectiveness and provide alerts if radon levels rise.
By implementing this system, the goal is to reduce radon concentrations in indoor air to levels below the recommended safety thresholds. Professional installation and periodic testing are crucial to the success of a radon mitigation system.
