Crawl Space Encapsulation

Crawl Space Encapsulation

High humidity in your crawl space — often caused by leaky foundation walls and exposed dirt — leads to mold and mildew growth, structural damage, poor indoor air quality, and wasted energy dollars.

Smart Space has been professionally encapsulating crawl spaces in residential homes for over 12 years.

Financing available

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Ask About Energy rebates and incentives

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Financing available

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Ask About Energy rebates and incentives

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How do I know if I need Crawl Space Encapsulation?

Poor Indoor Air Quality? Moisture Issues? Cold Floors?

Chiller & Boiler Pipe Insulation

Poor Indoor Air Quality?

↑ Before

  • Musty or damp smells in the home
  • Allergy flare-ups that never fully go away
  • Dust returning quickly after cleaning

↓ After Encapsulation

  • Clean, sealed air boundary
  • Reduced allergens and airborne contaminants
  • Healthier indoor air year-round
Chiller & Boiler Pipe Insulation

Moisture, Mold, Structural Damage?

↑ Before

  • Standing water or damp soil
  • Visible mold or mildew
  • Sagging insulation
  • Condensation on wood or ductwork

↓ After Encapsulation

  • Dry, sealed crawl space
  • Protected wood framing and insulation
  • Long-term structural stability
Chiller & Boiler Pipe Insulation

Cold Floors & High Energy Bills?

↑ Before

  • Cold floors in winter
  • Sticky, humid rooms in summer
  • HVAC running constantly

↓ After Encapsulation

    • Even indoor temperatures
    • Reduced humidity
    • More comfortable living spaces year-round

We offer free estimates. Book a Consultation Today!

Our Process

Step 1: Air Seal

Step 1: Air Seal

Seal off rim joists and crawl space vents to eliminate air leakage.

Step 2: Vapor Barrier

Step 2: Vapor Barrier

Install a heavy-duty, 16-mil string reinforced vapor barrier on the crawl space floors, walls, and columns.

Step 3: Secure Attachment

Step 3: Secure Attachment

Fasten the vapor barrier to the foundation walls using Ramset nails for a durable long lasting tight seal.

Step 4: Heat Seal Seams

Step 4: Heat Seal Seams

All seams in the vapor barrier are heat-sealed to create a continuous moisture barrier. Tape fails. Heating Sealing the seams does not.

Step 6: Insulate Exterior Walls

Step 6: Insulate Exterior Walls

Place insulation over the vapor barrier on crawl space exterior walls to improve thermal performance. We are critical of using Spray foam in crawl space.

Step 7: Seal & Insulate Access Hatches

Step 7: Seal & Insulate Access Hatches

Weatherstrip the crawl space entrance and install 2″ foam board insulation to the access door or hatch.

The Building Science of Crawl Spaces

Our Crawl Space Encapsulations are engineered for long-lasting protection and performance. We follow industry best practices by heat-sealing all seams, securely fastening the vapor barrier to walls and columns, and air-sealing and insulating the foundation walls to create a durable, energy-efficient, and healthy environment beneath your home.

Want to dive deeper into the building science and research behind our approach?

What Is Crawl Space Encapsulation?

Crawl space encapsulation is the process of converting a vented crawl space into a sealed, conditioned zone within the home’s building envelope. It involves installing a continuous vapor barrier over the soil and foundation walls, air-sealing all seams, vents, and penetrations, and insulating the perimeter walls to control heat transfer. This integrated system minimizes ground moisture, air infiltration, and condensation, stabilizing temperature and humidity levels while improving structural durability and energy efficiency.

Understanding Moisture & Humidty

Crawl spaces are often filled with moisture — creating the perfect environment for mold, mildew, and wood decay, while attracting insects and rodents. This moisture and its contaminants can be pulled into your living areas due to air pressure differences between the crawl space and the rooms above. The problem is even worse when HVAC equipment is located in the crawl space, spreading that damp air throughout your home.

While traditional building codes have long required passive vents and a vapor barrier, research shows that venting actually increases humidity during warm, humid months — even with proper drainage and damp-proofing systems in place.

In vented crawl spaces, humidity levels track outdoor conditions (70–95%). When vents are sealed and a vapor barrier is installed, relative humidity stabilizes near 50%. Mold and mildew thrive above 70%, highlighting the importance of encapsulation.

How Crawl Spaces Affect Indoor Air Quality

Your crawl space directly affects the air circulating through your home:

  • Leaky HVAC ducts can pull in pollutants, dust, and mold spores from the crawl space and distribute them throughout your living areas.
  • Winter pressure shifts cause air from the crawl space to rise through the home, drawing in even more contaminants.
Comfort & Energy Efficiency

Encapsulation helps stabilize your home’s temperature and comfort level year-round:

  • Cold winter air enters through vents and gaps, chilling floors.
  • Air sealing and insulating walls keeps the crawl space dry in summer and warm in winter.
  • HVAC systems run more efficiently when ducts are in a conditioned crawl space.
  • Homeowners often notice warmer floors and improved comfort after encapsulation.

Ready to make your crawl space work for you?

Ready to clean your crawl space?

What People Are Saying

Smart Home Atlanta did an outstanding job with our energy audit, duct sealing, and crawlspace encapsulation. The difference in efficiency, humidity, and air quality has been massive. High-quality work, excellent communication, and very informative throughout the process—highly recommend!

— Joseph W.
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Joseph Winslow profile picture
Joseph Winslow
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Smart Home Atlanta did an outstanding job with our energy audit, duct sealing, and crawlspace encapsulation. The difference in efficiency, humidity, and air quality has been massive. High-quality work, excellent communication, and very informative throughout the process—highly recommend!
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Martin Runnström profile picture
Martin Runnström
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Had insulation/weatherization done with Smart Spaces Atlanta. Excellent experience overall, from planning to doing the project and seeing great results. Great communication throughout. Team was very good, knowledgeable and were very cognisant of us having little kids and left the house clean after they were done. Highly recommend!
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S. Mashet Smith
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This year I opted to have an energy audit done on my home. Smart Space Atlanta was the company I selected to do so. From the first call I appreciated the responsiveness. Harden who was my contact person discussed the findings and made sure that I knew I could complete the upgrades at my convenience. I selected to have both my crawl space and duct repair done by the company within 2 weeks. The team which was overseen by project manager West were always punctual, professional and friendly. The site was left in a tidy manner each day. Now mind you my home is 104 yrs old and the work performed not only made it more energy efficient but visually pleasing as well. My crawl space went from a musty, dark and gloomy space to actually welcoming! Duct repairs means that the main floor will be warm and cozy this winter. I was referred to a plumber to complete my tankless water heater installation through the company as well. I could not be more pleased with the results! They will be my one and only call for attic insulation as next project. Sincere thanks for making my home more efficient for years to come with my family. Continue to display excellent customer service and awesome results for your customers!
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Marieh Scales
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I found Smart Space ATL on the GA Power website and went with them to do an energy assessment because from what I saw I perceived them to be a sort of concierge service where they would do the assessment, the work, and file the paperwork for the rebates. I knew I had an energy issue when I first purchased my home and my first month's energy bill was $300. Fast forward one year, I reach out to Smart Space ATL to conduct an energy assessment. I waited one year to be able to provide them with a year's worth of utilities to properly conduct the energy analysis. I really enjoyed working with Jason. He walked me through the process of what would be done and what to expect. I was able to be scheduled within 3 weeks of calling. They had to connect my air conditioning ducts, clean and seal them. And they also insulated the inside of my home and my attic and added insulation to my attic. Overall enjoyed the experience and everything went as discussed. Would definitely recommend them for an energy assessment and subsequent work to make your space more energy efficient.
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Jason Dailey profile picture
Jason Dailey
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Harden is awesome! She is patient and informative. We had a third party radon short-term and long-term test in 2021. The short-term returned at 27.6 pCi/L and the long-term at 12.1 ± 1.6 pCi/L. These results are horrifying! After some research on mitigation specialists, I decided on Smart Space Atlanta. Within 48 hours after installation of the mitigation system, which was pretty much custom since I requested they conceal the system running it through my floors and ceiling versus outside alongside my house, my radon average was 0.3. Fast forward to two years later, I tested two separate areas of the basement with short-term test conducted by Alpha Energy Labs. The room furthest away from the mitigation system returned at Less than 0.9 pCi/L and the main area of the returned at less than 0.7 pCi/L. These are pretty amazing results! My kids and their friends play down in the basement regularly. I have peace of mind that there are no radon exposures concerns. Thank you Harden and Smart Space Atlanta! Jason
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Seth Eden profile picture
Seth Eden
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My wife and I found Smart Space Atlanta when looking for a home inspection energy audit to improve our home's energy efficiency as well as make use of state and federal incentives. From the first communication we felt confident in their knowledge, communication, and results. In addition to providing us with a great breakdown of our home's specific deficiencies they also provided us with an exhaustive list of small things we could do ourselves to improve our home as well as lining up bigger projects that would have an impact on the quality of air in our home, our home's insulation, and efficiency. They were great at working with a delayed timeframe on our end and ultimately, we had them clean and seal our ducts to great results. Our a/c can finally keep up with the warmer months and more effectively keep it at our set temperature, a major issue for our home was our ac ducts leaking heavily into our crawlspace and thus the cool air not getting much into the actual house. We have yet to see what the energy savings will be as that will require time, but we are more than happy with the quality of life improvements we are already enjoying. They also have handled the rebates with GA Power and provided appropriate invoices and documentation for us to use for federal taxes next year. We are very happy with Harden and her entire team and plan on using them in the future for additional home energy improvements.
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Eric Stagliano profile picture
Eric Stagliano
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Smart Space is an amazingly competent company. I have used them for two different projects on my home. Each time, I was overwhelmed with their "extra mile" professionalism. Harden is incredibly honest and always seeks the best solution for any work that is being done. In one recent example (that just blows my mind), I agreed to have them do an extensive renovation project. We were about to start the project when Harden discovered a structural flaw in our A/C system and recommended that we hold off on her already scheduled work until the other problem was fixed. It is this kind of honesty that keeps me coming back. I will use them for all future projects in my home. I highly recommend them.
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Tom Viilo profile picture
Tom Viilo
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We had a great experience working with Harden and Ross on new windows for our whole home. They are not pushy, timely, and stand behind their window selection for customers.
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Aidan Hall profile picture
Aidan Hall
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Harden was great and Smart Space was easy to work with. Their crews were timely and respectful. They helped us lower our radon levels significantly and also improve the energy efficiency of our home. We were able to qualify for Georgia Power rebates and they do the paperwork. Highly recommend.
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