12 Mil is a measured of thickness and used in the plastic vapor barrier industry. 12 Mil is equivalent to .012 inches.

12 Mil crawl space vapor barriers and liners are the most popular choice for crawl space encapsulation. Both DIY homeowners and professional installers install more 12 mil vapor barrier that any other thickness. The reason 12 mil is so popular is because it offers both durability at a reasonable cost and a wide selection to meet the needs of the crawl space. Often times the home owners need some extra storage and all of our 12 mil vapor barriers offer this feature. 

Today, homeowners and professionals alike have many choices in both thickness and dimensions available to them in vapor barriers and liners for the crawl space. We offer homes with narrow pier spacing all the way up to a wide open space options to limit purchasing more vapor barrier than they need.

GuardianLiner™ & DiamondBack™ 12 Mil vapor barriers are made in America and the SilverBack™ HS is made in Canada. All of our vapor barriers for crawl space encapsulation are made to our high standards and tested by an independent lab before they are sold to you.


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12 mil Crawl Space Vapor Barrier
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Retail: $99.00
Price: $81.68
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CrawlSpace Repair Item #: 12MGL -

12 Mil Vapor Barrier GuardianLiner™ Extremely durable, high quality crawl space vapor barrier/liner. This crawl space liner has been a favorite of the professional community since it's introduction. There are three major components that make this liner an excellent choice for the crawl space environment. First, the white top layer and the tan bottom layer are made from 100% virgin polyethylene resin. This is very important because these layers will last indefinitely. Product performance &...

White Crawl Space Liner
Price: $302.24
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CrawlSpace Repair Item #: 12M-1000WB -

12 Mil DiamondBack This American Made crawl space liner is the basic string reinforced vapor barrier that can be compared to most other brands on the open market for the same stated thickness, 12 Mil. Actual 12 mil is equal to .012", not 12mm. This crawl space liner does not contain any additives and is reinforced with a 1000 denier polyester cord to stablize the layers and prevent tearing. The appearance of this crawl space liner is bright white on the face and black on the back. Although it...

12 mil Vapor Barrier
Price: $102.18
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CrawlSpace Repair

NEW Product Technology The SilverBack HS's technology comes from 60 years of outdoor environmental strength testing and is a premium engineered vapor barrier. With 100% of the surface protected by reinforcement made from strengthened polyethylene ribbons. The puncture and tear strength greatly outmatches even our SilverBack string reinforced vapor barrier product line.  The 12 Mil measures actual 12 Mil across the surface and looks great as wall or floor liner. This crawl space vapor...

DiamondBack 12 Mil Vapor Barrier Seamless
Price: $344.16
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CrawlSpace Repair Item #: 12MDB-85-SL -

12 Mil DiamondBack This American Made 12 mil crawl space liner is a string reinforced vapor barrier that can be compared to most other brands on the open market for the same stated thickness, 12 Mil. Actual 12 mil is equal to .012", not 12mm. This product is a nominal 12 mil, meaning does not measure 12 mil at the plastic, but it is close. This crawl space liner does not contain any additives and is reinforced with a 1000 denier polyester cord to stabilize the layers and prevent tearing....