The Highest Quality Crawl Space Vapor Barriers In Stock and Ready to Ship
Americover is a trusted provider of American-made crawl space vapor barriers. Our products are made with high-quality virgin resin, ensuring durability and reliability. Unlike general-use plastic sheeting or Visqueen alternatives, our vapor barriers are specifically designed to resist off-gassing and premature degradation, providing long-lasting protection for your crawl space.
Shop Our Top Selling Crawl Space Vapor Barriers
Pro Crawl Anti-Mold Vapor Barrier with MPT™
Pro Crawl Barrier™ 10 Mil Class 1 Vapor Barrier
20 Mil Dura-Skrim® Reinforced Plastic Sheeting
12 Mil Dura-Skrim® Reinforced Plastic Sheeting
8 Mil Dura-Skrim® Reinforced Plastic Sheeting
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Class 1 crawl space vapor barrier with ultra-low permeability (0.022 perms)
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Outperforms standard 10-mil moisture barriers in vapor transmission control
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Integrated MPT™ technology helps inhibit mold growth below the home
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Supports crawl space encapsulation, structural protection, and indoor air quality
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Durable 10-mil crawl space vapor barrier with high-gloss white finish
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Class 1 moisture barrier with low permeability and high tensile strength
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New 5′ × 100′ roll fits 4′ crawl space walls and tight access areas
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Reduces material waste and simplifies vapor barrier installation
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Heavy-duty 20-mil reinforced vapor barrier for demanding applications
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Reinforced scrim delivers exceptional tear and puncture resistance
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Ideal for high-traffic areas, debris-covered ground, and jobsite protection
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Trusted for long-term surface protection in harsh environments
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Versatile 12-mil reinforced vapor barrier for crawl space encapsulation
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White surface improves visibility in dark crawl space conditions
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Balanced strength and flexibility for easier handling during installation
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Reliable moisture protection without the stiffness of heavier films
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Lightweight 8-mil reinforced vapor barrier for tight crawl spaces
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High flexibility allows faster installation in confined areas
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Effective moisture barrier solution with lower material cost
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Ideal when ease of use and budget efficiency are priorities
Trust Americover with your next crawl space vapor barrier purchase.
Quality Vapor Barriers
Multi-layered, extrusion laminated & reinforced
Tear resistance for increased service life
Meet or exceed ASTM specifications
Low permeance barrier (<0.03)
Class A permeance rating
Better Results
Prevents unpleasant odors
Eliminates moisture damage
Improves indoor air quality
Prevents of structural damage
Reduces pest infestations
How Do You Measure a Crawl Space for a Vapor Barrier?
To measure your crawl space for a vapor barrier you will need to take the following measurements:
• Length of crawl space
• Width of crawl space
• Height of the foundation walls, or as high up on the walls you are going to encapsulate
• Perimeter Length of the entire space (length + width) multiplied by 2
Since most crawl spaces are less than 4′ tall, using a 4′ or 6′-wide vapor barrier for the walls will keep the seams to a minimum.
Watch a tutorial about how to calculate the square footage of your crawlspace.
Which Mil Thickness is Right for Your Crawl Space Vapor Barrier?
The video to the left will help you understand which mil thickness is best for your crawl space. A 6 mil vapor barrier is the minimum thickness recommended for encapsulation, but we advise you to take into consideration the following conditions:
- Ground conditions
- Traffic frequency
- Radon presence
- Geographical location
Shop By Mil Thickness
Choosing the right mil thickness makes all the difference in performance, durability, and cost. Whether you’re working in a tight crawl space, protecting high-traffic jobsite areas, or installing a reinforced vapor barrier for long-term moisture control, mil thickness helps define how your material will perform. Thinner options offer flexibility and easier handling, while thicker materials deliver added strength, puncture resistance, and extended service life—so you can select the right balance for your application.
Radon Mitigation
Radon Mitigation Vapor Barriers: What to Look For
A radon mitigation vapor barrier plays a critical role in limiting how radon gas enters a building through crawl spaces or beneath concrete slabs. The U.S. Environmental Protection Agency recommends mitigation when indoor radon levels reach 4.0 pCi/L (148 Bq/m³) or higher.
When selecting a vapor barrier for radon mitigation, performance goes beyond basic moisture control. Look for materials engineered and tested to function as soil gas retarders, with extremely low permeability, long-term durability, and reinforced construction that maintains integrity over time.
For higher-risk applications, advanced barriers may incorporate specialized gas-retarding layers such as EVOH, which are designed to significantly reduce radon diffusion—not just slow moisture vapor.
[Learn more about EVOH and why it matters for radon mitigation →] (blog coming soon)
Crawl Space Vapor Barrier Accessories
Vapor Tape
White Vapor Tape is a heavy duty, weather resistant tape often used to seam large panels of poly sheeting together for vapor retarders, crawl space liners, covers and other liner applications. This tape is sold in individual rolls of 4″ x 180′.
2-Sided Butyl Tape
Double sided butyl tape is an insoluble tape with an aggressive adhesive that bonds plastic sheeting to porous surfaces such as concrete in crawl spaces. The waterproof bond adheres best when the application surface is clean and dry.
Ratchet Fasteners
Christmas Tree Ratchet Fasteners are made of heavy duty nylon with a 1/4″ diameter, flat white head and conical tip. Ratchet fasteners are used to attach vapor barriers to the foundation wall & are available in packs of 100 pieces or 500 pieces.
Have more questions about crawl space encapsulation vapor barrier products or projects? Give us a call at 760-237-8786 to speak with one of our representatives. Monday-Friday 6am-6:30pm PST.
Why Americover?
Get your product when and where you need them
Contractors fight enough delays between weather, equipment failures, labor shortages, and subcontractor delays. The last thing you need is essential products like vapor barriers failing to arrive on time.
For over 25 years, Americover has built a proud reputation by getting contractors what they need when they need it. From the point that you first consider our products, we offer you a long-lasting and comprehensive partnership.
Contractors and Builders Talk About Americover
When you partner with Americover, you benefit from our industry and product application knowledge.
But don’t take it from us. Take it from those in the building industry who have relied on our quality and reliability over the years.
Check out our online selection of specialty plastic building solutions. Contractors and distributors are eligible for special pricing and volume-based discounts on select products, call us at 760-237-8786. Our online inventory is just our retail selection, which means we can often source items you may not see here.
Crawl Space Resources
Americover’s Product Catalog
Browse our full inventory of vapor barrier and crawl space encapsulation liner products.
Conversion Calculators for Easy Measurements
We’re doing the math for you! Get started with our easy-to-use conversion calculators.
Crawl Space Product Line Card
Compare the technical specifications of each product to find the perfect crawl space vapor barrier for every job.
Crawl Space Product Accessories Line Card
Find the accessories are essential for crawl space encapsulation.
How to Install a Crawl Space Vapor Barrier
Americover’s crawl space vapor barriers and liners are manufactured in America with virgin resins and uv inhibitors, if installed properly it should last up to 20 years or more. Purchasing at your local hardware store may be less expensive and more convenient, but it is likely to be compounded mostly of recycled resins containing a lot of debris and contamination which can cause off gassing, as well as shorten the lifespan of the liner causing it to degrade much faster, and requiring it to be replaced much sooner than anticipated. For more information on Virgin poly vs Regrind visit our Blog.
1. Cut the Vapor Barrier to size. The vapor barrier liner comes folded and rolled on a core. It is easier to cut and size the liner material before you take it into the crawlspace. After the material is cut to size roll it up (white side on the inside) so when you unroll it in your crawlspace it stays clean.
a. To cut the Floor Pieces, measure and cut a piece of vapor barrier liner material wide enough to cover the floor from the wall to the 1st line of piers or support then proceed to measure and cut the remaining floor pieces.
i. IMPORTANT: Don’t forget to measure enough material to seal an overlap of 6-12 inches on the wall pieces and pieces beside it.
b. For the Wall, keep the seams to a minimum by using a 4 ft or 6ft wide vapor barrier, since most crawlspaces are less than 4′ tall.
2. Start with the walls. To attach the liner, apply the 2 sided butyl tape 4 inches – 6 inches down from the top of the wall or sill plate. (This is to leave a space for pest inspection). *Do not remove the release liner on the exposed side of the tape until you are ready to attach the liner. (It may be easier to first apply the butyl tape to the vapor barrier, and remove the release liner as you are applying it to the wall.) otherwise, remove the release paper from the butyl tape in about 4 feet – 6 feet increments.
3. Fasten the Liner with some type of permanent fastener every 24 – 30 inches. The fasteners should go through both the material and the butyl tape. This can be accomplished by one of the following methods:
a. Use a Hilti
b. Use a Ramset Powder Fastener
c. Drill a 5/16″ hole and press in our Christmas Tree Ratchet Fasteners
4. Installing Vapor Barrier on the Floor. Starting at the piers or support posts, cut and notch the vapor barrier on both sides of the support about 6-12 inches above the ground. Wrap the vapor barrier to fit tightly around the support, and use the 4 inch white Vapor Tape to seal the material.
5. Smooth the liner out from the supports to the wall and tape the seams with the 4″ White Vapor Tape.
a. Overlap the Seams 6 inches to 12 inches.
b. You may remove your footwear or use disposable shoe covers to keep the vapor barrier liner clean.
Backup Under Slab Vapor Barrier 9 April, 2014 Americover's under slab vapor barrier passes ASTM E1745 class A. This is a high performance material designed to stop moisture migration and control gas. 
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Best Vapor Barriers for Walls 14 March, 2024 In-wall vapor barriers play an important role in protecting homes against potential issues. But many of these benefits vary depending on the location of your property. Vapor barriers control the flow of moisture and air within the home and can be a fantastic option if you live in the suitable…
For Contractors and Distributors, we offer special pricing, volume discounts, short lead times and a dedicated account manager who will work with you to get exactly what you need. If you would like to speak with a representative, contact us at 760-237-8786.