Many homes in the Charlotte, NC, area have crawl spaces beneath, designed to raise the building above the ground and give access to contractors as they install HVAC, electrical wiring, and pipework. However, if these crawl spaces are exposed, they can often suffer from moisture issues, leading to fungal infestation, mold, and even foundation settlement. With poor maintenance, these issues could compromise the property’s structural integrity and attract termites. All these problems could result in expensive repairs, so many homeowners consider sealing off this area through encapsulation. What do you need to know about crawl space encapsulation, and what should you consider before starting this project?

What is crawl space encapsulation?

Crawl space encapsulation involves adding a powerful moisture barrier to the floor, sealing the space completely. Before the encapsulation is complete, our technicians commonly install drains to flush out unwanted water. After this, a polyethylene product is applied to any surfaces to protect from moisture, with sealing tape used to provide additional protection. This protection ensures that humidity does not penetrate the walls and create longer-term problems. But it doesn’t get rid of the moisture itself. To do this, you should also install a dehumidifier to control the vapor levels in the sealed-off crawl space.

Our Crawl Space Encapsulation System

Moisture Loc specializes in crawl space encapsulation services, providing a total climatization of your crawl space. The GreenSpace™ is our ultimate encapsulation system. This system combats high moisture and humidity levels, mold or mildew, and standing water problems in your crawl space. Because the crawl space environment is temperature controlled, moisture levels are kept low, and mold prevention is more effective. So, our GreenSpace™ Sealed Crawl Space System locks out moisture, sparing the home and homeowners from health issues, hazards, and structural damages due to excessive moisture.

A small space beneath a building is protected with a crawl space encapsulation system.
A cinderblock stack reinforces a building's foundation that has been equipped with crawl space encapsulation.


The first step in our sealed crawl space encapsulation is installing a durable poly liner in the crawl space. Our crawl space encapsulation technicians place a 17-mil poly liner along the interior crawl space walls, around the interior crawl space piers, and over 100% of the crawl space floor. We tape and caulk the liner so your crawl space stays fully encapsulated. As a result, moisture doesn’t rise from the ground and into your floor system, insulation, and home.

A brick building's exterior crawl space vent is sealed as part of the seal vent encapsulation process.


The next step in sealing a crawl space is ensuring no humid outside air is getting into your crawl space. We secure the vents with a commercial-grade insulating board so that hot or cold air from outside will not get into your crawl space.

Wall insulation after crawl space encapsulation servicing works to reinforce a building's foundation.


After sealing the vents, we recommend adding insulation to reinforce your crawl space encapsulation. Adding insulation to crawl space walls improves thermal resistance in masonry walls. As a result, it should significantly improve your home’s energy efficiency and conserve heating and cooling costs.

A white de-humidifier used to control moisture is used during a crawl space encapsulation.


A dehumidifier is an essential step in crawl space encapsulation. Moisture Loc uses dehumidifiers specifically for crawl space or basement applications. The Santa-Fe Dehumidifier is placed into the crawl space to dry out humid air and keep moisture away. This dehumidifier includes a fan that draws in moist, humid air through a cold evaporator coil, effectively cooling the air below its dew point. Once the air temperature is below the dew point, it turns into water, which is collected and automatically drained.

Debris-free flooring joists are prepared to receive new installation during a crawl space encapsulation treatment.


If insulation is aged or damaged due to high moisture, it can cause Fungi growth, create cold or hot spots in your floors, and increase energy loss through weak areas in your flooring.

Removing the old or damaged insulation and replacing it with new insulation improves heating and cooling properties in your home and reduces your risk of Fungi growth.

Benefits of Crawl Space Encapsulation

There are many benefits associated with crawl space encapsulation, including:

  • reduce the risk of mold and mildew accumulation
  • provide structural protection for the property
  • improve air quality in the home
  • keep termites and other pests at bay
  • and optimize your energy efficiency

If you don’t consider encapsulating the crawl space, be on the lookout for a raft of potential problems other than those mentioned above, including:

  • musty odors
  • rusting metal
  • trapped soil gases in the space
  • and buckled hardwood flooring in your living area

Problems are commonly unnoticeable in the early days, as they may only manifest when the damage has become quite severe. Unfortunately, this can lead to costly repair work, which needs to come before crawl space encapsulation.

What’s the difference between sealing and full encapsulation?

The difference between crawl space encapsulation and sealing lies in the level of protection your foundation receives. With sealing, you cover the floor and the lower part of the wall with a moisture-proof barrier. It’s a less effective approach than a full crawl space encapsulation, and you won’t be able to control the moisture and vapor as efficiently. With encapsulation, you cover the ceiling and all the exposed walls in addition to the floor. You will then add a sealant to hold the polyethylene products in place.

Things to Consider Before Encapsulating

Prepare the area before beginning the crawl space encapsulation. Inspect the general drainage system around the home and make alterations as necessary. Ensure that water runs away from the periphery. Hire a drainage company if you require assistance. If the area is suffering from mold accumulation, clean and remove growths before you begin. If mold has caused any damage to joists or other structures, bring in the experts to conduct crawl space repair first.

Additionally, inspect your combustion appliances and ensure proper ventilation to the outside air. You’ll want to do this before crawl space encapsulation to avoid any backdraft from these appliances into your living space.

Working With the Experts

Crawl space encapsulation can be tricky and time-consuming work. You should always outsource to the experts —contact foundation repair professionals at Moisture Loc for their help today.


Moisture Loc offers an Annual Inspection and Maintenance Plan to give you peace of mind that your system is at peak performance. Our trained technicians will return a year after installation to check your system and ensure your investment works effectively.


The GreenSpace™ Sealed Crawl Space Encapsulation is our best option for a permanent solution to humidity in crawl spaces. High humidity levels lead to mold growth and moisture, eventually causing structural damage to your home. Therefore, it is essential to repair this issue as it will continually worsen.

Request a free consultation to find out if the GreenSpace™ Sealed Crawl Space encapsulation is the right solution for your crawl space.

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