Crawl Space Encapsulation FAQs

If you're worried about mold, want to improve air quality and efficiency, and prevent damage to the foundation, crawl space encapsulation is the most effective way to stop moisture under your home. Because this is such a comprehensive update, it's normal to have questions to see if encapsulation is right for your home. To help you decide, our certified crawl space experts are sharing the answers to our most frequently asked questions.

What Is Crawl Space Encapsulation?

Crawl space encapsulation is a process of sealing the space under your home, preventing all moisture and outdoor air flow from entering the space. The foundation walls and floor are overlapped with heavy sheets of thick plastic that cover every inch of space and extend all the way up to where the foundation meets the house. The end result is a clean, dry, fully sealed crawl space in which humidity and moisture can't enter.

What Causes Moisture in a Crawl Space (and Why Is It a Problem)?

When a house is built over a crawl space, moisture enters in three ways:
  • Moisture within the soil under the home evaporates and is trapped in the crawl space;
  • Heavy rains and runoff around the home enter through cracks and gaps in the foundation or seep in through the blocks;
  • Humidity from outside enters through vents, cracks, and crevices.
While you may think that what happens in the crawl space stays there and isn't a problem, a majority of the air in your home enters through the crawl space, traveling up through cracks and gaps in your subflooring and into your home. This moisture can end up causing the following problems:
  • Mold growth under the house can lead to spores in the living areas of the home;
  • Poor air quality in the home caused by mold, mildew, and bacteria can cause respiratory problems and illness;
  • Damp, musty odors in your home;
  • Pests that are drawn to damp, dark spaces, including roaches, mice, and termites, can infest your crawl space and your home;
  • Excess moisture can rot wood floor joists and lead to structural problems;
  • Heated and cooled air in your living spaces can escape down through your crawl space, causing increased energy bills.
Water and moisture can lead to both short term and long term problems for your home and family, and it's necessary to solve the issue to prevent them.

Is Crawl Space Encapsulation Necessary?

In North Carolina, our humid summers and heavy thunderstorms can continually expose your crawl space to moisture, dampness, and even pooling water. Crawl space encapsulation completely seals out moisture from the space under your home, offering the only comprehensive solution available, preventing the damage it causes.

Why Choose Crawl Space Sealing Instead of a Vapor Barrier?

A vapor barrier is a sheet of plastic installed over the floor of the crawl space. While it does block moisture that evaporates up from the surface, it's only a partial solution as it leaves the walls, vents, and cracks around the foundation open, allowing moisture, water, and humidity to flow into the area. Crawl space encapsulation places a barrier over the floor and also seals the walls, vents, and other exposed areas.

Will Sealing the Crawl Space Improve My Home's Air Quality and Efficiency?

Absolutely. The air beneath your home has been contaminated with mold spores, mildew, and other bacteria and pollutants caused by stagnant moisture. That air moves upward from the crawl space and into the living areas of your home, bringing the contaminants with it and harming your air quality. This problem can be compounded if you have HVAC ducts under your home. Leaks in the duct work allow the contaminated air to circulate up through your vents and at the same time, the heated and cooled air in your home from your HVAC system is seeping down into your crawl space or leaking out in your ducts. By sealing the space, the air under your home will be cleaner and healthier, free of mold and mildew, so when it enters your home, it won't cause respiratory problems or illness for your family.

Will Sealing the Crawl Space Prevent Pests and Termites?

In North Carolina, termites need damp soil for their colonies as well as easy access to wood and cellulose. An unsealed crawl space offers both of these, making them especially susceptible to termite infestation and the ensuing damage. In addition to termites, roaches, mosquitoes, and other pests are drawn to moisture, and will often set up nests or colonies in crawl spaces where they can easily enter your home looking for food. Encapsulation means that not only will there not be any moisture to attract pests, but they won't have a way in at all.

Can I Use an Encapsulated Crawl Space for Storage?

Once the area is completely encapsulated, with the exception of a well-fitted access panel, the area will be dry and clean, making it an excellent option for storage.

Do the Vents Need to Be Blocked During Crawl Space Encapsulation?

This is an area of debate for homeowners and contractors because there is an outdated belief that there has to be venting in a crawl space for air to escape. However, vents are only necessary when the crawl space isn't sealed as they allow a small amount of trapped moisture and gases under the house to escape. When the area is sealed, there's no moisture or gas build up to worry about, and venting will only cause humidity to enter the space.

Schedule a estimate for Crawl Space Encapsulation and Waterproofing in Raleigh

If you're concerned about moisture under your home and both the short-term and long-term problems it can cause, we can help. Our experienced, licensed team will seal the space under your home, creating a dry, clean space that will make it safer, healthier, and more efficient. To learn more or to schedule a quote for service, reach out to us at  919-847-7072 or complete our online contact form below.

What People Are Saying about Our Crawl Space Encapsulation

By the time we complete any crawl space encapsulation or moisture remediation project, our clients have determine that we deliver on our promise of outstanding service.

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  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon

    Excellent Service Provided!

    Your crew is professional, knowledgeable, customer oriented and committed. The work area was very clean after they finished. Your company exceeded my expectations!!
    Jim D
    Happy Customer
  • Customer Reviews

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    Keeps Things Clean

    Your company is very professional. Most companies do not clean up after themselves, so the homeowner has to do it! Your guys left the area very clean. Don’t let your sales rep go. He is very knowledgeable! Great Job! We
    Read All
    Your company is very professional. Most companies do not clean up after themselves, so the homeowner has to do it! Your guys left the area very clean. Don’t let your sales rep go. He is very knowledgeable! Great Job! We have given your information to our neighbors, so I am sure we will be seeing you next door very soon
    Charles R
  • Customer Reviews

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    One of the Best

    Your company was one of the only ones in the Triangle who was able to tell me how the job would be done that would meet NC Building codes and what the current industry methods/materials are. I did a lot
    Read All
    Your company was one of the only ones in the Triangle who was able to tell me how the job would be done that would meet NC Building codes and what the current industry methods/materials are. I did a lot of research..I know what I am talking about and would recommend Jason’s company to anyone needing encapsulation
    J.G.
  • Customer Reviews

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    A+ BBB Rating

    The sales rep was very professional in explaining what was required to fix the problem. That and you’re A+ rating with the BBB was the reason I chose you. The crew is friendly, punctual and knowledgeable. For those in need
    Read All
    The sales rep was very professional in explaining what was required to fix the problem. That and you’re A+ rating with the BBB was the reason I chose you. The crew is friendly, punctual and knowledgeable. For those in need of crawl space service, I would highly recommend this company
    Dan B.
  • Customer Reviews

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    Most Informative & Professional

    We had our crawl space sealed by a pest control company last year, but we had many problems and did not trust them to fix the problem. So, I got a total of 4 estimates from other companies and your
    Read All
    We had our crawl space sealed by a pest control company last year, but we had many problems and did not trust them to fix the problem. So, I got a total of 4 estimates from other companies and your company was by far the most informative and professional of them all. The crew was great. Very professional and your sales rep, Rob was very knowledgeable. Thank you for finally getting our crawl space problem fixed!!
    Bob S.
  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon
    Jason was one of the most prepared and knowledgeable technicians I have ever dealt with. He followed up and answered all questions honestly..The crew was focused, courteous and informative
    C. S.
  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon
    I appreciate the follow-up and great service after the work was performed. When we had the extremely heavy rains, the float stuck on the sump pump. Everything was resolved to my satisfaction. It is comforting to know that you all
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    I appreciate the follow-up and great service after the work was performed. When we had the extremely heavy rains, the float stuck on the sump pump. Everything was resolved to my satisfaction. It is comforting to know that you all back up your products and service
    Ronald R.
  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon
    You all had a very reasonable price and VERY good references! Thanks again for a professional job, and explaining how a crawl space is supposed to be done.
    Daniel S.
  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon
    Rob was the only sales rep to talk to me about permits for my job and the work and materials meeting the building codes. I called many of the references on your list (that is a big list!), and what
    Read All
    Rob was the only sales rep to talk to me about permits for my job and the work and materials meeting the building codes. I called many of the references on your list (that is a big list!), and what they told me is the reason I chose you all for the job. They were right. You all did a great job!
    Hank C.
  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon
    I got your name from Angie’s List and my realtor. I heard you guys were the best crawl space crew in the area. Great Work Guys!!
    James V.
  • Customer Reviews

    5.0Star Icon Star Icon Star Icon Star Icon Star Icon
    Jason, Thank you for all of your work and support to make our crawl space area dry and secure. Your responsiveness to any questions or issue is impressive and very appreciated. Thank you and your team for all of their
    Read All
    Jason, Thank you for all of your work and support to make our crawl space area dry and secure. Your responsiveness to any questions or issue is impressive and very appreciated. Thank you and your team for all of their hard work and support!
    M.B.
    • Did you know?
    CBTofNC in Business for over 30 years

    Did you know that 50% to 60% of the air on the first floor of your home comes from your crawl space or basement?

    Excess water intrusion can cause severe damage to the structure of your home and create high levels of moisture and humidity, which leads to mold. Allergies, asthma and skin irritations can be affected by abnormal levels of humidity, moisture and mold in your living environment.

    Crawl Space & Basement Technologies specializes in Sealed Crawl Spaces and Interior Drainage Systems for your Crawl Space or Basement. With our Lifetime and Transferable Warranty, we not only improve the air quality of your home but also restore the microbial remediation certification structural stability of the home’s foundation. Our team of crawl space and basement experts can help you determine the necessary solution for your home and your budget.

    We offer a comprehensive line of services designed to protect your home and to prevent moisture problems and damage. Count on our Raleigh Crawl Space and Basement specialists for crawl space encapsulation, crawl space waterproofing, basement waterproofing, spray foam insulation, vapor barriers, and mold remediation.

    Do you need a Crawl Space or Basement Specialist?

    We will gladly come to your home for an estimate. Contact us today!