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Crawl Space Vapor Barrier

Vapor barriers do exactly what their name suggests, they keep water vapor out of your crawl space. Without these important tools, your entire home is put at risk.

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Have you noticed mold, wood rot, or humidity in your crawl space? All of these crawl space problem signs indicate an excess of moisture below your home. However, Basement Authority of West Virginia has a solution designed to prevent this problem – a crawl space vapor barrier. Here, we’ll explain how the product works and how to figure out if you need one.

How a Crawl Space Vapor Barrier Works

Vapor barriers are powerful tools that positively impact your home. Keep in mind, installing them takes precision and training that should be handled by a professional. 

  1. Our vapor barrier is 20-mil thick and covers the entirety of your crawl space. We’ll measure your crawl space and locate the best areas to attach your vapor barrier before the installation process even starts. After these measurements are made, our team will prep the area. 
  2. Prepping the area involves removing any debris from your crawl space such as rocks or collapsed insulation.
  3. Next, our technicians add moisture-proof insulation to your vapor barrier to ensure that the crawl space stays dry well into the future. 
  4. Finally, our team lays out the vapor barrier and secures it to the walls and floor with a special adhesive. This covers all exterior access points to ensure moisture has no way to enter your crawl space. Our vapor barriers are guaranteed to provide a permanent solution to moisture below your home and keep your home safe for years.

Why Our Vapor Barrier Stands Out

  • Basement Authority of West Virginia’s vapor barriers are more durable and long-lasting than any other brand on the market. With a 20-mil thickness, our vapor barrier is resistant to rips and debris in your crawl space.
  • Our vapor barrier is designed to be used in tandem with our other crawl space solutions such as dehumidifiers or crawl space vent covers. This makes it a more versatile product than other vapor barriers.
  • Vapor barriers can help reduce pests below your home. While our vapor barrier is not a pest control solution, it makes it nearly impossible for pests to get into your crawl space and prevents the humidity that draws animals there in the first place.

Signs Your Home Needs a Vapor Barrier

Wood Rot

Wood rot occurs when the wood is exposed to high levels of moisture. Since many crawl spaces are built with wooden frames and supports, humidity below your home makes this problem more likely to occur. Not only does wood rot look unpleasant, but it also puts the entire structure of your home at risk. If wooden beams in your crawl space break down enough, it could lead to more problems like a sagging floor. Vapor barriers prevent your home from being damaged by this devastating process.


Have you noticed that it’s more humid in your home than usual? Your crawl space is likely to blame, as trapped humidity eventually rises into your home. This can cause utility bills to spike and may lead to moisture damage in your home. Furthermore, humidity in your crawl space leads to other problem signs like wood rot or mold. Vapor barriers are specifically designed for this issue, as they maintain low humidity levels in your crawl space, and by extension, your entire home.


Mold is especially prevalent in unprotected crawl spaces, as it requires two specific things to thrive: high humidity and organic material. Most crawl spaces are built with wood, which provides a food source for mold to feast on as humidity rises. Over time, mold can spread into your home as it releases spores into the air. Spores have the potential to cause respiratory issues for anyone living in your home, and they could start growing more mold in other areas like bathrooms or closets.


We don’t advise it. Many store-bought vapor barriers simply aren’t thick enough to provide adequate protection. Plus, installing a vapor barrier requires precise measurements and specialized tools. Any misstep in the process will still allow moisture to get into your crawl space and may end up damaging the DIY vapor barrier anyway. Save time and money in the long run with a professional solution.

Modern vapor barriers are usually made with polyethylene sheeting, a durable material that is impenetrable by moisture. Generally, this is the best material for a vapor barrier. Using other materials is often why other vapor barriers fail. You might see other vapor barriers made with elastomers, metallized film, or even metal sheets. Most contractors accept that polyethylene is the superior material.

Absolutely. Without one, your crawl space is likely exposed to all kinds of outside elements like rain, humidity, and pests. Using a vapor barrier improves the longevity of your crawl space. Since your crawl space also serves as your home’s foundation, vapor barriers also increase the longevity of your home. Installing a vapor barrier simply makes your home more efficient. 

Contact Us for a Free Crawl Space Inspection

Now that you understand how vapor barriers work, consider working with Basement Authority of West Virginia to keep your home secure. No homeowner wants to deal with higher bills or mold in their living space. Vapor barriers save you money while making your home efficient. We’ve helped thousands of homeowners in Huntington, Morgantown, Charleston, and throughout West Virginia keep their crawl spaces safe since 2003, and we can do the same for you. Contact us today to learn even more about our crawl space solutions and to schedule a free inspection with one of our specialists. We’ll determine the source of your crawl space troubles and come up with a plan designed to meet your individual needs!

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Clarksburg, WV

1807 West Pike Street Ste C
Clarksburg, WV 26301