Radon Mitigation



(Even zones of low recorded radon values may measure high)


There are different thresholds for acceptable levels of radon gas depending on where you live. Here in Oregon, the Environmental Protection Agency’s (EPA) recommended action level of 4.0 pCi/L is universally enforced, except at Environmental Works, where we guarantee radon reductions to below the World Health Organization’s (WHO) limit of 2.7 pCi/L*. Radon gas generated from the soil beneath your home or property is vented and mitigated by reversing the sub-slab or crawlspace pressure. This is accomplished by creating a suction point below the foundation or within the crawlspace from which a radon fan continuously draws air from the soil via PVC or ABS pipe. Rather than radon infiltrating into the structure, a radon mitigation system will negatively pressurize the air below the foundation, exhausting harmful gases to above the roofline instead of them being positively pressurized into your home or business. The most common method of radon reduction is ‘Active Soil Depressurization’, explained in greater detail below.

Environmental Works approaches each home or property individually, assessing the areas of greatest concern. We conduct pressure extension testing to confirm suction point(s) location efficacy and engineer a radon mitigation system that effectively rids your home of carcinogenic gases without being an aesthetic eyesore. Our initial inspection allows us to provide a customized radon solution to each client to get the best radon reduction system for your money, with an EWorks Lifetime Performance Guarantee! Everything from cold joints between foundation walls and slabs, to floor drains and unsealed sump pumps, must be considered to ensure a successful installation. A poorly built wall channel drain, unsealed foundation slab, or even an unbalanced HVAC system can contribute to elevated radon levels.

System Design and considerations of structural components are essential to devising an effective plan that doesn’t turn into a nightmare of additional work and rising costs. Environmental Works does the right research up front to install the most effective radon mitigation system at the most affordable price. We also include a post-mitigation inspection radon test to prove our systems are in fact working properly. Furthermore, we design systems to blend in with the building itself, taking preventative measures to reduce issues of noise and unsightliness. EWorks bids our radon abatement systems with a solid upfront price*, with guaranteed radon reduction to below the WHO Action Level of 2.7 pCi/L**, and we will install an additional suction point at no additional cost to get the job done right!
(*additional systems not included unless otherwise noted in contract. **applicable to MOST residential home radon systems)

Each radon mitigation includes system labeling, an accessible manometer to easily monitor radon fan functionality, and a Lifetime Performance Guarantee to keep radon levels below 2.7 pCi/L that transfers with ownership!

Post-Mitigation Radon Testing is included with all of the radon mitigation proposals sent out by Environmental Works. There is no way to know our system is doing its job effectively until a final post-mitigation radon test is completed, nor will you see a bill until the job is done right!  Short-term (2-4 day) follow-up radon testing is an industry standard and serves as the final form of proof that the home or business is now safe from high levels of radon! Upon installation, our technicians will then set a CRM (Continuous Radon Monitor) in the lowest livable location and a certified testing professional will return a few days later to assess and analyze the data, promptly reporting the results to the appropriate parties.

It is recommended to do follow-up radon testing every 2 years to ensure continued system performance.


Active Soil Depressurization is the most frequently used method of reducing radon levels in single family and multifamily residential houses. These systems involve the creation of negative sub-slab (below the concrete floor) pressure to reverse the normal flow of soil gases upwards into your home or building. Upon assessment of the building’s layout and potential sources of radon gas, a convenient suction point and interior or exterior fan locations are chosen that both retain functionality of the home and optimizes sub-slab suction of the mitigation system. By tapping into the substrate beneath your home, the radon fan captures soil gas and volatile organic compounds (VOCs) through a strategically selected suction point(s), venting harmful gases to above the roofline through sealed PVC/ABS piping. Environmental Works uses primarily 3” and 4” Schedule-40 PVC pipe, AMG® Radon Fans, and industrial grade sealants and hardware for a professional, long-lasting final product.

Sub-Slab Depressurization (homes or buildings with slab on grade concrete floors or basements) involves drilling a 5-6” hole, known as a suction point or suction pit, being drilled through the foundation floor of your home, typically in the lowest livable location. Approximately 5 - 20 gallons of substrate (soil, rock, sand, gravel, etc.) is removed to create a sizable cavity (suction pit) from which the suction fan will draw air, thus creating negative pressure underneath your home. The suction point(s) location is determined based on the layout of the home to ensure maximum pressure extension and radon reduction.  Environmental Works makes every effort to select unfinished areas of a basement to dig these suction points, such as a utility or laundry room. In cases where no such space exists, suction points can be discreetly concealed within closets, corners, or even drywall framing to minimize the amount of exposed pipe and noise. Ultimately, EWorks will expertly determine the optimal location to drill the suction point(s) prior to constructing the entire mitigation system using a process called Pressure Field Extension Testing.

Pressure Field Extension (PFE) Testing is a method we use at Environmental Works to gauge the potential success of a proposed suction point location before completing the installation process. This level of certainty saves everybody time and money, ensuring a mitigation system will succeed at reducing radon levels once all is said and done. PFE testing involves the drilling of a small ¼” hole in one or more locations of a home’s foundation floor away from the suction point, and the use of a manometer (highly sensitive pressure gauge) to measure the negative pressure being generated by the proposed suction point equipped with a temporary radon test fan. Should an additional suction point be necessary, PFE testing enables EWorks to assess exactly where it should be, or the best location for a second suction point. This helps to ensure that the system will perform well before installing a permanent system.  All test holes are fully sealed upon completion.

Sealing of system penetrations, pipe/fitting connections, and structural components are necessary to achieve desired system performance, along with preserving the aesthetics and longevity of a home. Unsealed plumbing fixtures/drains, large cracks/gaps, or cold joints in a foundation must be properly sealed for a radon mitigation to effectively reduce radon levels. Environmental Works uses industrial grade, resilient caulking and expanding foam to maximize sub-slab suction of our systems, sealing sump pumps.  Sealing of all joints and cracks in existing homes can be difficult due to floor finishes, but we will always seal problem areas that are accessible during install.

Sub-Soil & Sub-Membrane Depressurization systems (homes or buildings with crawlspace foundations) effectively reduce radon from homes that contain or sit atop a crawlspace foundation type, as opposed to a slab-on-grade foundation. Environmental Works opts to use this proven process to reduce the occurrence of future rises or spikes in radon levels, and subsequently, the need for future service calls. Sub-membrane radon abatement systems utilize 3” or 4” corrugated pipe, installed underneath a 6 mil PE plastic vapor barrier that covers all exposed dirt within a crawlspace, which is then sealed with a urethane adhesive to the foundation perimeter, posts, utilities, etc. This creates a negative pressure on the soil beneath the vapor barrier, thus diverting the flow of sub-soil vapors and gases outside of the home. Existing crawlspace vapor barrier will be repaired and/or replaced depending on the current condition, with a minimum of 12” overlapping at foundation walls and seams, helping reducing dust, mold, and the intrusion of odors, along with radon gas, into the living spaces. For particularly tight or difficult crawlspaces, with adequate existing vapor barrier, a process called sub-soil depressurization is utilized by creating a suction pit(s) in the crawl space with limited installation and sealing of plastic vapor barrier in the proximity to improve pressure extension. The suction pit(s) is piped and backfilled with drain rock, sealed at the top with industrial pipe flashings, expansive foam, and urethane sealant for soil gas collection below grade. 3” schedule-40 PVC or ABS vent piping will exit from the crawlspace suction point to an externally mounted radon fan with 3” vent pipe to discharge above the roof line (unless a viable internal route can be found with fan mounted in an attic space).

Vapor Barriers & Crawlspace Treatments can provide relief to your home beyond the extraction of harmful radon gases. Vapor barriers reduce the intrusion of dust, mold, and odors into living spaces, and may also help with unwanted moisture or water accumulation. EWorks offers crawl space remediation services that may be rendered in addition to a radon mitigation system or a service in and of itself.



As of April 2011 the State of Oregon adopted senate bill 1025 establishing minimum requirements for radon resistant new construction.  The state of Washington adopted similar radon system requirements years prior.

New residential and multi family structures must now have a minimum passive radon mitigation system according to EPA radon mitigation standards. These design standards are found in Appendix F of the Oregon Residential Specialty Code. The standards were adopted and implemented due to the risks associated with radon gas exposure in buildings and the simplicity and effectiveness of these systems when designed into the rough structure of the building. New construction systems often outperform retrofit systems for a lower installed cost, when installed correctly.

Environmental works has partnered with residential and commercial building and remolding companies to provide fast, high quality and affordable new construction radon mitigation systems, backed by a fully transferable 10 year guarantee that it will passively work.  If it needs a fan to bring levels down, then we will install it for FREE!

Our expertly designed passive radon systems are fully code complain and often solve the radon issue completely without any further mitigation procedures being necessary. The passive system can easily be made active if post build testing is above 4.0 pCi/L by simply adding a continuous radon fan.

Don’t Trust just anyone to install your radon mitigation system. You can rely on Environmental Works to provide you and your customers with the highest quality radon mitigation system, fast and professional service, and long term peace of mind.

  • All guarantees and warranties are transferrable to ALL future owners of the same property.
  • Environmental Works guarantees that our radon reduction system will maintain average long term radon levels below 2.7 pCi/L for a Lifetime*, based upon long term radon testing
  • (91 days to 1 year) and subject to the Terms and Conditions of the Contract. *After our initial system(s) is shown to be effective.
  • The Client must perform a long-term Alpha-Track Test (Client to purchase and set up independently) and provide Environmental Works with the results.  If average radon concentrations exceed 2.7 pCi/L, Environmental Works will make system modifications to reduce radon levels to below the WHO action level, and at no cost to the Client*.  *Single fan system and up to two suction points. 
  • Environmental Works will replace defective mechanical or electrical components of the system up to 20 years after system installation and beginning at the time of system activation. (Radon fans covered under manufacturer’s warranty).
   AMG® Radon Fans hold a full manufacturers replacement warranty of 5 years (Optional 5 year extended warranty- 10 year total), and Environmental Works will

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