Protect your health. Test your home.



Pipe, Pipe Size and Vents

We only install schedule 40 PVC pipe. Most homes with continuous slab space under 2000 sq ft will have great success with 3 inch pvc pipe. Larger homes may require 4" piping. Pipe sizing is a function of slab size, air leakage and sub slab material.

Systems capable of high air flow can continue long distances with several turns and still accomplish the mitigation objective, which increases the options for installing the most aesthetically pleasing radon system. Tight soil conditions with limited air flow may require a minimization of bends and pipe extension.

radon mitigation pvc piping

Guards are placed on vent openings if obstructions are likely to enter the system, however NRPP guidelines do not recommend the use of rain caps as they restrict air flow from the system.

Radon on the exhaust side of a fan can be hundreds to thousands of pico curies per liter. If you have an active Radon system and the vent is not a proper height or distance from openings, or the Radon fan is in livable space, you should contact a certified professional for repair. 

The end of the vent pipe must be a minimum of 10 ft above grade, and above the roof eave, whether it is installed inside or out. The vent must also be a minimum of 2 ft above any openings, while maintaining the 10 ft above grade guideline. If the vent is not 2 ft above an opening, then it must be 10 ft from it, and maintain the 10 ft above grade rule.


St. Louis Radon repairs existing systems at a nominal cost.


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.

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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