Welcome to Part 2 in our blog series about Radon Mitigation systems. If you missed Part 1 where we covered radon, the invisible invader, and the history of radon awareness in MT.
In part 2 of this series, we will look at the importance of radon mitigation systems and what they look like.
Importance of radon mitigation systems (RMS)
Removing radon from indoor spaces is crucial due to the potential health risks associated with prolonged exposure to elevated levels of radon gas and its decay particles. Radon is a radioactive gas that is colorless, odorless, and tasteless, making it imperceptible to human senses. The primary reasons for the importance of radon mitigation include:
Removing radon is crucial for reducing the risk of lung cancer, protecting respiratory health, ensuring safety in homes and workplaces, maintaining property values, complying with regulations, and providing peace of mind to occupants.
Radon Mitigation System Design
There are primarily three types of radon mitigation systems commonly used to reduce indoor radon levels: sub-slab depressurization (SSD) systems, sub-membrane depressurization systems, and ventilation systems.
Sub-Slab Depressurization (SSD) Systems: How it Works: This is the most common and effective method. It involves creating a vacuum beneath the building’s foundation by inserting a pipe through the foundation floor and into the soil below. A fan is then connected to the pipe to draw radon-laden air from beneath the building and vent it outside, preventing its entry into the living spaces.
Applicability: SSD systems are suitable for homes with basements or slab-on-grade foundations. They are especially effective in areas with high radon concentrations in the soil.
Sub-Membrane Depressurization Systems: How it Works: This method is similar to sub-slab depressurization but is designed for homes with crawlspaces. A gas-permeable membrane is installed over the soil in the crawlspace, and a ventilation pipe and fan are used to create a negative pressure, preventing radon entry and directing it outside.
Applicability: Sub-membrane depressurization systems are ideal for homes with crawlspaces and are effective in reducing radon levels in these areas.
Ventilation Systems: How it Works: Ventilation systems focus on increasing the air exchange rate within a building to dilute radon concentrations. This can be achieved by using exhaust fans to pull fresh outdoor air into the building while simultaneously expelling indoor air containing radon. This method is more common in areas where radon levels are moderate, or in homes with unique circumstances that make using an SSD system challenging.
Applicability: Ventilation systems are suitable for homes with crawlspaces or where sub-slab depressurization may not be practical. They are often used as a secondary or alternative approach, particularly in homes with lower radon levels.
All three types of radon mitigation systems require professional installation to ensure effectiveness and compliance with local regulations. Homeowners are advised to conduct radon testing to determine the appropriate mitigation strategy for their specific circumstances.
In part 3 of this series, we will look at the costs involved in installing either a sub-membrane or sub-slab depressurization system.
Committed to Your Safety and Peace of Mind – Jennifer Thorne Testing Services Manager | IAC2 Certified for Mold & Radon | NRPP Certified: 113525-RMP, 113629-RMS | DEQ Meth Certified: MCP-0146-C
Inspect Montana serves clients across Montana including Lolo, Missoula, Hamilton, Corvallis, Florence, Victor, Darby, Alberton, Polson, Ronan, St. Regis, Clinton, Stevensville, Philipsburg, Drummond, Frenchtown, St.Ignatius, Garrison, Lincoln, Sula, Pablo, Deer Lodge, Bitterroot Valley and throughout Western Montana.
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Radon Mitigation – Cost of Ownership (Part 3)