How Much Does It Cost to Install Vapor Barriers?

By Hannah Stephens

December 12, 2024

While moisture-proofing your crawlspace isn't the most glamorous home maintenance task, keeping it in good condition can help prevent mold, electrical problems and even structural issues.

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What Is a Crawlspace Vapor Barrier?

Crawlspace vapor barriers, also known as crawlspace moisture barriers, are waterproof membranes that line the inside of your crawlspace and prevent moisture from entering. Homeowners install vapor barriers to protect their houses against water-related damage.

Installing a crawlspace vapor barrier can reduce the risk of:

Wood rot
Moisture damage to your floors and other home surfaces
Pest infestations
Mold
Electrical faults

Most vapor barriers consist of sheets of polyethylene plastic sheeting. Installers overlap the sheets and seal the seams to keep the crawlspace as moisture-free as possible.

Vapor barrier sheets come in various thicknesses, usually measured in mils. One mil is equivalent to 0.001 inches, and most products range from 6 to 23 mils thick.

The U.S. Department of Energy recommends installing a vapor barrier of at least 6 mils, and you may require a thicker membrane depending on your local climate and construction style. For example, you may need a thicker, more durable barrier if your crawlspace floor contains sharp rocks. A professional installer can recommend the correct crawlspace liner for your home's features.

How Much Does Vapor Barrier Installation Cost?

According to HomeGuide, vapor barrier sheeting costs $0.15 to $0.50 (CAD 0.21 to CAD 0.70) per square foot, while sealing tape prices range between $120 and $200 (CAD 167 and CAD 278) for a typical project. The thickness of the membrane significantly impacts the cost of materials. The thicker the material, the more you'll likely spend.

Professional labor costs an extra $1.50 to $3 (CAD 2.09 to CAD 4.17) per square foot. Most homeowners pay $2 to $4 (CAD 2.78 to CAD 5.57) in total per square foot for materials and installation.

The overall cost to install a vapor barrier depends on the size of your home. Vapor barrier installation in a small home starts from around $1,200 (CAD 1,670), and you could spend up to $4,000 (CAD 5,565) on installing a moisture barrier in a large crawlspace. These prices include vapor barrier sheeting, sealing tape and professional installation.

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Can I Install a Vapor Barrier Myself?

Vapor barrier materials are inexpensive, so you can save a lot of money by installing the membrane yourself. The process is relatively straightforward, but it involves working in a dark, confined space and can be strenuous. Installing your own vapor barrier can even be dangerous if your crawlspace contains sharp or loose materials, so it's worth assessing the space first and hiring a pro if you're unsure of your DIY skills.

If you choose DIY installation, be sure to use headlamps or other types of lighting to improve visibility and safety. Face masks and other protective gear reduce the risk of inhaling debris and protect you against injuries while working in your crawlspace.

How Long Does Vapor Barrier Installation Take?

The time it takes to install a vapor barrier depends on the size of your crawlspace, the existing moisture levels and whether you hire a professional. Before installing a moisture barrier, you should dry your crawlspace using a wet vac and dehumidifier. Removing moisture from a relatively dry crawlspace takes around 10 hours, while drying a crawlspace with significant moisture issues can take several days.

Professionals can usually install plastic membranes in a few hours, but it could take longer in a particularly large or irregular-shaped crawlspace. Allow more time for your project if you plan to install the sheeting yourself and don't have experience in fitting your own vapor barrier.

All CAD conversions are based on the exchange rate on the date of publication.

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