crawl space encapsulation

Enclosing a crawl space is a common practice nowadays since it prevents water damage and other issues from entering a house through the area. Crawl space encapsulation is a sound investment in the long-term health of your home’s structure and the comfort of its inhabitants. Also encapsulating your crawl space is one of the most cost-effective and efficient options to enhance your home’s interior air quality and save utility bills.

crawl space encapsulation

Pros and Cons of Crawl Space Encapsulation

Below are some of the notable benefits of having your crawl space encapsulated.


  • Improves air quality
  • Pest and insect control
  • Keeps mold and mildew at bay
  • Helps with energy-efficiency
  • Makes floor comfortable
  • Keeps wiring safe


  • Expensive
  • Cannot be used as storage space
  • Might require HVAC system upgrade
  • Regular maintenance

Improves Air Quality

Enclosing your crawl area will improve the quality of air throughout your house, making it safer to breathe for you and your loved ones.

Pest and Insect Control

Dampness is essential for the survival of insects like termites. Enclosing a crawl space makes it impossible to foster an environment favorable to insects like termites. If you have a crawl space and are worried about insects, rodents, or other pests, hiring a professional to encapsulate it is the wiser solution.

Keeps Mold and Mildew at Bay

When moisture is removed from under your property, you prevent unwanted moisture concerns. Also, your HVAC system will not bring any unpleasant scents into your house, like musty or damp ones.

Makes Your Foundation Last

Preventing moisture buildup in your crawl space is crucial for the long-term health of your home’s foundation. It’s important to keep the crawl space dry so that moisture doesn’t seep into the soil around the house’s foundation. While gutters direct water away from the base of your house, a damp crawl space can still lead to structural issues. Enclosing your crawl area will keep moisture out and make your foundation stronger for the long haul.

Helps with Energy Efficiency

Utility costs can be reduced by having your crawl area dried up so your HVAC system doesn’t have to work as hard to dry out the air. Crawl space encapsulation may help your home save money on energy bills and is, thus, a worthwhile investment.

Makes Floor Comfortable

If your crawl space is encapsulated, even in the dead of winter your home’s hardwood and tile flooring will be at the right temperature for bare feet. A further benefit of encapsulation is that it prevents the damp and muggy sensations of summertime humidity from seeping into your house.

Keeps Your Wiring Safe

In addition to being dry, an encased crawl space may safely hold a number of different types of utility equipment. You may rest easy knowing that your systems are safe from the dangers of moisture and humidity when they are in an encased environment as opposed to an open crawl space.

Just like any other if there are benefits there are also some drawbacks that come along with crawl space encapsulation. And here are some of them.


This is the most glaring problem in encapsulating off the crawl space. Costs for this project typically range from $1,500 to $15,000. The cost will be determined by factors such as the floor area of your crawl space, the difficulty of access, the condition of the crawlspace, and the amount of work required.

Cannot be used as storage space

Your home’s crawlspace could be used as extra storage if you could only get to it, but that’s not going to be possible if there’s no door to it. Any items you plan to remain in your crawl space after encapsulation will need to be moved somewhere, as you will need to break the seal to get to them.

Might require HVAC system upgrade

When you enclose your crawl area, you reduce the amount of air that can freely circulate around your house. Because of this, the effectiveness of your HVAC system, which was likely built considering the previous airflow pattern, may have decreased. If your home’s heating system relies on combustion, this might happen more often.

After having your crawl space encapsulated, you may notice that your home is not as warm or cold as it used to be. If this is the case, you may want to consider upgrading your HVAC system.

Regular maintenance

A monthly inspection and maintenance schedule is required once a crawl space encapsulation system has been installed. Your recurring expenditures may be the same or even greater than they would be if you just let the crawl space exist without the upgrade, depending on the number of features you selected for this update. The product’s sealing benefits may not provide the necessary return on investment if you reside in an area that doesn’t get a lot of rain or moisture.

Crawl Space Encapsulation vs Vapor Barrier

Encapsulation is the process of covering the whole area of your crawlspace using white plastic sheets. This includes the floor and the walls of the crawl space. For optimal results, it is essential to seal all of the seams and corners. A dehumidifier and sump pump are necessary for the extremely efficient running of your encased environment. A regular dehumidifier wouldn’t be able to handle the conditions in a crawl area, so you couldn’t use one there.

Since encapsulation uses a dehumidifier in addition to a sump pump, it is highly effective in removing water, particularly in more severe situations like a burst pipe.

The vapor barrier on the other hand requires only the floor of your crawlspace to be sealed. Black plastic sheeting of 6mm thickness is used. It’s possible to use thinner materials, but 6 mm will hold up the best over time. Because there are no airtight crawl space vents, neither dehumidifiers nor sump pumps are required.

Vapor barriers, in contrast to encapsulation, have uses outside of crawl spaces. When necessary in wetter climates, they are also utilized for insulation. They go inside the insulation in places with low temperatures. They go on the exterior of the insulation in warmer areas.

Crawl Space Encapsulation Alternatives

Interior Drainage system

Moisture that seeps in via the foundation or the crawl space is drained away by an internal drainage system. An internal drainage system is designed with perforations in the drain pipe to collect water from both the drain and the room inside.

Crawl Space Dehumidifiers

Crawl space dehumidifiers are powerful enough to handle the high humidity found in crawl areas and are designed to run continuously. If the room becomes flooded, however, or if a lot of water pools on the ground, it will be useless.

Vapor Barrier

Crawl space floors and walls are lined with thick plastic to act as a vapor barrier, also known as a moisture barrier. One of its primary functions is to keep water out of your crawl area. It also prevents any moisture from the air outside the wall from entering the crawl area. Crawl spaces can be protected against the accumulation of moisture by the use of a vapor barrier and enough cross ventilation.

Crawl Space Encapsulation FAQs

Is it necessary to encapsulate crawl space?

If your home has a crawl area, you should get rid of all the moisture in there as soon as possible. Moisture in your crawl space can lead to damage to your home’s foundation. With these, the answer to the question at hand should be a big YES.

Does crawl space encapsulation really work?

Some may say No but, with rising electricity prices, it’s great news that crawl space encapsulation may increase your home’s energy efficiency by as much as 20 percent. The carbon footprint of a house may be decreased by cutting back on electricity consumption. Yes, it does work.

How long does an encapsulated crawl space last?

Standard guarantees for crawl space encapsulation projects typically range from 15 to 20 years. A properly sealed crawlspace can persist for over 20 years if humidity levels are maintained and natural disasters like flooding are avoided.

Crawl space encapsulation cost

As mentioned above this project ranges from $1500 – $15000 depending on the factors such as size of the area, accessibility, and the amount of work needed.

Is crawl space encapsulation tax deductible?

Some municipal and state governments match federal tax credits for energy-efficient home upgrades like crawl space encapsulation.

Final words

at first glance, crawl space encapsulation seems like an expensive project. But looking at the long-term benefits that it will provide, every homeowner should consider encapsulating their crawl space. If you are not sure where to start, always consult a professional and avoid doing it yourself.

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