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ISI Insul-Barrier Insulated Vapor Barrier 4’ x 25’ IB425 - Case of 15 Minimum
ISI Building Products
Our Item #: 20513
- MFG #:
$90.42 -
ISI Insul-Tarp 1/2" Under-Slab Insulation 6’ x 25' IT0750625 - Case of 10 Minimum
ISI Building Products
Our Item #: 20514
- MFG #:
$143.82 -
ISI Viper 6.5-mil Clear Crawl Space Vapor Barrier 4' x 200' CS654200CLR - Case of 25 Minimum
ISI Building Products
Our Item #: 20509
- MFG #:
$148.25 -
ISI Viper 6.5-mil Crawl Space Vapor Barrier 4' x 200' CS654200 - Case of 25 Minimum
ISI Building Products
Our Item #: 20508
- MFG #:
$153.44 -
ISI Viper 10-mil Crawl Space Clear Vapor Barrier 4’ x 200’ CS104200CLR - Case of 25 Minimum
ISI Building Products
Our Item #: 20510
- MFG #:
$209.76 -
ISI Viper 10-mil Crawl Space Vapor Barrier 4’ x 200’ CS104200 - Case of 25 Minimum
ISI Building Products
Our Item #: 20505
- MFG #:
$220.80 -
ISI Viper 6.5-mil Crawl Space Vapor Barrier 12’ x 100’ CS6512100 - Case of 25 Minimum
ISI Building Products
Our Item #: 20507
- MFG #:
$222.35 -
ISI Viper CSX Crawl Space Vapor Barrier 4’ x 125’ CSX4125 - Case of 12 Minimum
ISI Building Products
Our Item #: 20511
- MFG #:
$282.92 -
ISI Insul-Tarp 1/2" Under-Slab Insulation 12’ x 25' IT0751225 - Case of 10 Minimum
ISI Building Products
Our Item #: 20516
- MFG #:
$287.63 -
ISI Insul-Tarp 1/2" Under-Slab Insulation 6’ x 50' IT0750650 - Case of 10 Minimum
ISI Building Products
Our Item #: 20515
- MFG #:
$287.63 -
ISI Viper 10-mil Crawl Space Vapor Barrier 12’ x 100’ CS1012100 - Case of 25 Minimum
ISI Building Products
Our Item #: 20506
- MFG #:
$314.63 -
ISI Viper CSX Crawl Space Vapor Barrier 6’ x 125’ CSX6125 - Case of 12 Minimum
ISI Building Products
Our Item #: 20512
- MFG #:
$441.37
Vapor Barriers
Vapor barriers are critical in controlling moisture and preventing mold growth in crawl spaces, basements, and other areas prone to dampness. By creating a durable, waterproof layer, vapor barriers help protect your home’s structural integrity, improve indoor air quality, and enhance insulation efficiency. They are especially important in crawl spaces and under slabs, where moisture intrusion can cause damage over time.
At Conservationmart.com, we offer premium vapor barriers exclusively from ISI, a trusted name in building products. Our selection includes vapor barrier sheets like Insul-Barrier and Insul-Tarp, vapor barrier tapes, and specialized products such as ISI Viper and ISI Viper CSX designed for crawl space and basement applications. Whether you need a 6 mil or 10 mil poly vapor barrier, our ISI products provide superior strength and reliable moisture control to keep your home safe and dry.