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

I cannot say enough great things about working with Evergreen Home Performance. Everything including the initial consultation, the fabulous work crew, the office support and the final resolution was handled in a caring and professional manner. My only regret is that I did not know about them earlier. I enthusiastically recommend Evergreen to anyone with concerns about home energy use.

Darlene R

Bath

Very Satisfied with the work performed by Evergreen. Professional employees, high quality work done in a timely manner. My sales rep was Justin, and he was phenomenal During the initial walk around my house, he gave me great ideas for how to improve the efficiency of our home. We will consult with Evergreen for our future home projects.

Adam G.

Westbrook

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

From start to finish, our experience was incredible. Justin was extremely helpful. The crew was fast, friendly, and efficient. And most importantly, our home is WAY warmer and our heating is less costly. I'd highly recommend evergreen to anyone looking to upgrade their home!

John S.

South Portland

Evergreen listened and produced a thoughtful evaluation, proposal and comprehensive plan for our attic and basement. They exhibited excellent workmanship, teamwork, and came back as planned after the completion of the job to test the outcomes. Their overall performance as insulation and home improvement contractors is truly outstanding and we highly recommend them.

Susan S.

Saco

Evergreen came back this year to finish insulating our house. We have been remodeling and renovating an 1850s cape for several years. Their employees are very professional and pleasant to deal with. Over several years Brian Robinson has been able to schedule us in for several small areas that needed addressing and finally turning a room we used to close off in the winter into a comfortable usable space. We primarily heat with wood and since Evergreens great work our furnace has only come on ONCE this winter. Fantastic. Really satisfied customer in Thomaston.

Chris F.

Thomaston

Nothing but good things to say. The guys that came and did the actual work were extremely nice and did a great job. The energy audit was thorough and I was presented with multiple improvement options, I was even given ideas for improvement that Evergreen didn't offer. I never felt like I was being "sold".

Ryan Adams

Evergreen Home Performance shows its expertise from start to finish. Evergreen did three house projects in winter/spring/summer 2020 for me, attic insulation, crawl space under a porch insulation, and basement foam/vapor barrier. From my initial discussion with Bryan, I understood the reasons for choosing different types of insulation, the associated costs, and time estimates. Evergreen scheduled in advance, came when they said they would, and the crews were highly professional in their work and demeanor.

Iris S.

Portland

Great company. Very professional and thorough. They take the time to explain everything and offer options to fit your budget. Wonderful experience from start to finish.

Bonnie Eustace

Working with Evergreen was a dream! Professional, knowledgeable, and super clean work. Communication was fast and service impeccable. The bedroom floors in our 1960's split ranch will be warm with the new insulation between them and the garage. Bring on the snow! (not really, but sort of)

Jess Dee Proctor

Working with Brian and with Nate and the rest of the crew was a pleasure. They made everything very easy and understandable. This was a major renovation and they were always at the ready with a lot of information. We had an extensive renovation on the basement which was a dirt basement and it came out beautifully. We can already tell from all of the insulation work what a difference it's made in sound and temperature. Brian worked with me on the rebates that are available when you do this kind of work. I would highly recommend this company to…

Valerie L.

Rockland

Our house still the most efficient home we’ve ever lived in. And we have you folks to thank for that! A special howdy to Brian Robinson please!

Bruce O’Donal and Eva Butler

Evergreen did an amazing job insulating our historic home. Their professional staff worked hard to ensure the tough areas in the attic were covered, and clearly communicated their progress. We are seeing the results with our discounted heating bills. Thank you, Evergreen!

Melissa Knoll

Portland

The crew members from Evergreen Home Performance each made sure to greet us every day, while maintaining their distance in this time of the pandemic. Their work took a total of nine days, spread over three weeks. Even though they were working in multiple rooms of our house, as well as the basement and attic, they were unobtrusive and always cleaned up after themselves every day. The on-sight manager kept us informed of their daily schedule so we'd know which parts of the house they'd be working on.

Bob & Sue

Whitefield

I would recommend Evergreen wholeheartedly because of their professionalism, their follow through, and thoughtful project planning.

Jennifer A

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