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There’s a number of crawl space encapsulation materials you’re going to need to complete your crawl space project completely.

When it comes to encapsulating your crawl space, there’s a wide variety of different materials you’ll need for your project.

The encapsulation process refers to sealing up the crawl space, closing it off from the outside environment. Many of the crawl space products you’ll need to use are going to be the same for any project. Some of the main products you’ll need should be researched carefully and we’ll go over both in this article.

Crawl Space Vapor Barriers

There’s no shortage of crawl space vapor barriers out there. However, I wouldn’t recommend just buying the first thing you see. You should do your research and find a high quality vapor barrier. Two of the highest reviewed crawl space liners on the market is the GuardianLiner vapor barrier and the SilverBack vapor barrier.

Be aware, moisture barriers come in different sizes. The most common sizes used are the 20 mil vapor barrier (for the crawl space floor) and the 12 mil vapor barrier (used on foundation walls). The 20 mil is recommended for durability and for rough crawl space floors that may contain big rocks, roots, or other large elements.

As an added piece of protection, you can also add the Felt550 to protect your crawl space floor vapor barrier. Both the SilverBack and GuardianLiner 20 mil crawl space liners are durable, dependable and made with the best of materials. I seriously doubt they will ever tear, but you may want to add the Felt550 so it last longer. It’s just an extra step of protecting your investment. The Felt550 is not required, but that is one more option you’ll have.

Vapor Barrier Tapes

You’ll need seam tape and foundation tape to connect all of your crawl space liners.

If you don’t use the crawl space tape correctly, you can end up with problems that you don’t want. Make sure you’re using vapor barrier tape properly and make sure the right type of tape is being used.

Using Vapor Barriers

Your crawl space liners will be used on the floor and foundation walls. Now, one rule you need to follow is overlapping your crawl space vapor barriers. 10-12 inches is the recommended overlap. You’ll use seal tape to connect them and foundation tape to connect the vapor barrier to the foundation walls. You can use caulk to ensure your liner gets a good seal.


Yes, you want to encapsulate the piers in your crawl space as well. Again, the same rules apply. You need to overlap by 10-12 inches.

Crawl Space Dehumidifier

Just as the crawl space vapor barrier, you need to find a high quality dehumidifier for the crawl space also. This will help you control the air flow of the crawl space. Two recommended crawl space dehumidifiers we personally suggest are two of the most popular units on the market. The Santa Fe Compact and the AprilAire 1850 model are both quality crawl space dehumidifier units.

Encapsulation Cost

Yes, encapsulating the crawl space can be a costly investment. If you’re a DIY homeowner, you can save a few thousand dollars on labor cost alone. The average cost is going to fall in the range of $3K-$5K, give or take both ways. It all depends on the size of your crawl space and exactly what’s wrong with your crawl space.

Now, if you have moisture problems in your crawl space, the crawl space encapsulation cost can quickly rise to 5 figures. It all depends on the damage the moisture caused.