Radon Mitigation

Radon Mitigation

Basement Waterproofing Services That Set Evergreen Apart

Other companies stop at “dry.” We go all the way to healthy.

What’s Hiding in the Air Beneath Your Feet?

Radon is a colorless, odorless gas that can enter your home through cracks in the foundation – and long-term exposure is the number one cause of lung cancer for non-smokers in the U.S.

Unfortunately, many Maine waterproofing companies unintentionally make radon problems worse. The same holes created to remove water and moisture from your home can actually make it easier for radon to enter.

At Evergreen, we take a different approach. Our basement waterproofing services don’t just keep water out – they keep your air safe as well.

Waterproof Basement with Spray Foam
Evergreen team walking through basement

When you work with Evergreen, you get:

  • A free basement consult with a free radon test kit (*as long as you don’t already have a mitigation system in place and haven’t recently tested for radon)
  • Solutions that protect both your basement and your indoor air quality
  • A partnership with trusted local radon experts at Air & Water Quality, if mitigation is needed

Whether you already have a radon system in place or haven’t yet tested, we’ll make sure your waterproofing plan doesn’t just fix one problem while creating another. Radon levels can change over time due to weather, soil conditions, and home renovations. We recommend testing every 2-5 years, especially after significant home improvements (including air sealing and waterproofing services) or changes in occupancy.

Why Maine Radon Awareness Matters

Most of Maine is in Zone 1 on the EPA’s radon map – meaning we’re at the highest risk for naturally occurring radon gas. Approximately 36.5% of all radon tests in Maine exceed the EPA action level of 4.0 pCi/L, which underscores the importance of testing and mitigation.

If your home has:

  • A dirt-floor basement or crawlspace
  • Cracks in the basement floor or walls
  • A sump pit or drainage channel
  • Musty smells or signs of high humidity
  • Open, non-radon-tight drains

…then radon is a potential concern. And if you’re doing any kind of waterproofing, it’s essential to make sure it’s done right.

Old House In Meadow near seaside
Water Proof Basement Sump Pump

Drain the Water Out Right, Radon Tight!

At Evergreen, we combine water control with air quality awareness. That means:

  • Using sub-slab or sub-vapor barrier depressurization systems
  • Sealing sump pits
  • Properly installing vapor barriers

Homes naturally draw air up from their bottom levels into living spaces due to a building science concept known as the stack effect. That’s why depressurization in your basement or crawlspace is so important, as well as exhausting any soil gas outside of the home with a piped fan.

Schedule a Free Consult & Get Peace of Mind

We’re not just here to stop puddles. We’re here to improve your entire home – starting at the ground level. You shouldn’t have to choose between a dry basement and a healthy one. With Evergreen, you get both.

Evergreen team discussing basement inspection with homeowner

Call 207-594-2244 or book your free consult online. We can help you build a basement waterproofing plan that’s as safe as it is effective.

A healthy Maine basement isn’t just dry — it’s safe for your family, too.

BOOK YOUR FREE CONSULT + FREE RADON TEST KIT

Evergreen came out 2 years ago to do an assessment and insulate our roof. This year we had them come back and do the basement as well. They are hands-down the best crew we've ever hired to work on our house. They are experts at what they do, and super meticulous in their work. After working in our house for a week with blown insulation, there was no trace they were ever here. We've seen a huge decrease in our energy bills while at the same time the house has become way more comfortable. Can't recommend them enough.

RC Lations II

Portland

Great team!

George S.

Bath

"Working with Evergreen from start to finish was a great experience." See what our customers have to say about their experience with Evergreen Home Performance. 

Jeff L.

The team members were very professional, worked very hard, paid very close attention to detail and cleaned up meticulously every day. I really appreciated the care they took knowing the smallest details were going to make a big difference to our heating bills. Thank you!

Pam B.

Brunswick

Evergreen has insulated two homes that we've owned now and both times we experienced exceptional service and craftsmanship. Our rep, Justin, went above and beyond answering questions and the installation team was attentive to every detail, including pulling out old poorly installed insulation and redoing a bathroom fan that wasn't up to current code. They also left the place spotless every day! Our home is already so much warmer this fall and we are looking forward to using less oil this winter.

Eva G.

Falmouth

Evergreen is the "go-to" company for improving the efficiency of your home. There are others to choose from but none so effective, honest, and capable as Evergreen. They did a great quantity of dense packing cellulose to improve our home (both for energy efficiency and for sound insulation) and it was totally successful. They are on-time, helpful, and caring. They clean up to a level that can't be over emphasized. This was the second time we employed them and we'd use them again if the opportunity came. You'll not be sorry to select Evergreen.

Dirk F.

Belfast

Our basement was the eyesore of the house. I wanted to make improvements, but first needed to make structural, insulating and moisture mitigation improvements. Evergreen was professional and competent in taking on a complex project of not only encapsulation and insulation of basement and crawlspace, but completed needed improvements to the structural integrity of the wood floor platform above a crawlspace and brought in a concrete contractor to pour where there was once a rotting, tiered wood platform - replacing that area with a more functional and tight tiered concrete area.

Duane B.

East Boothbay

We just finished a large project air sealing and reinsulating our 1890s basement and attic. It had been completely renovated 8 years ago, but still felt cold, and lacked proper energy assessment and corrections. We met with Justin in December and were very impressed with his knowledge, professionalism and communication skills and knew Evergreen was who we wanted to work with. Dave was our on hands project manager and was excellent. The office staff has been quick to respond and helpful as well when needed.

E Gallant

Kennebunk

The Evergreen crew from initial inception to installation were professional, on time, and left our place spotless. The end result was exceptional.

John Brown

Led by Brian Robinson, the Evergreen Home Performance team just completed an insulation refit at my home. It was truly a great experience from start to finish, a period of time that was a fraction of the time that I originally anticipated due to the team's unbelievable work habits and professional knowledge of their tasks. As impressive were the communication skills and friendliness of each and every member of the team.

Anne W.

Rockport

Great job installing windows and insulation.

Bob S.

Rockland

Evergreen did a fantastic job insulating our 1930's home. The onsite team was professional, clean, and really just a joy to interact with throughout the process. A blower test at the end showed a significant decrease in air leakage. I highly recommend Evergreen.

Kristen H.

South Portland

We are thrilled with the job Evergreen did to transform our 213 year old home into a warm, draft-free, cozy space. The entire team led by Bruce was prompt, courteous, knowledgeable, and hard working. If Evergreen could transform our home in this way, we are sure they would make a comparable difference in YOUR home!

Jonathan M.

Bridgton

I am very pleased with my experience with Evergreen Home Performance. I met several times with Richard Burbank and he was very detailed in his explanations to all of my questions. He provided me with several options for improving the insulation to our home. The team of installers were very professional and respectful of our home. They did a great job of cleaning up every day after the days work and they were also very responsive to all my questions as well as we collaborated to get our home better insulated. It was a pleasure to work with Richard and…

Brian C.

Falmouth

From beginning to end – that is from the moment Justin McEdward stepped into our home to assess our energy conservation needs until the crew left – the Evergreen Home Performance process went absolutely smoothly. Justin made a thorough inspection and took pictures with an infrared camera. His proposal described the scope of work in detail, and he explained what we could expect the proposed work to accomplish. Our proposal was forthcoming within a couple of days, and Justin was available to discuss it and answer questions.

Adrienne Harkavy

Portland Buy Local
Efficiency Maine
EPA Lead-Safe Certified
Building Performance Association
BPI Certified