Our 4" x 180' heavy-duty crawl space vapor barrier tape is built specifically for sealing and securing crawl space liners during encapsulation projects. Designed with contractors in mind, this professional-grade seam tape features a rugged 9.0 mil poly film and a high-tack synthetic rubber adhesive engineered to bond tightly to smooth or textured polyethylene vapor barriers.
Tested to a 0.09 US Perm rating under ASTM F1249, this tape helps prevent ground moisture, odors, and outside humidity from infiltrating the crawl space—making it an essential component of long-term moisture management systems. Whether you're joining seams, patching tears, overlapping barriers, or sealing around piers and foundation walls, this tape maintains an airtight, watertight seal even in demanding crawl space conditions.
This tape has been trusted in residential and commercial encapsulation projects for its strong adhesion, durability, and ability to withstand high humidity, temperature swings, and jobsite wear. At 180 feet per roll, contractors get extensive coverage for large crawl spaces while minimizing seam breaks and installation time.
Perfect for encapsulation systems, vapor barrier installations, dehumidifier prep, radon mitigation liners, and full crawl space moisture control upgrades.
FEATURES & BENEFITS
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9.0 mil thick durable poly backing for crawl space durability
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High-tack synthetic rubber adhesive bonds to textured and smooth liners
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ASTM-tested 0.09 US Perm rating for moisture-resistant performance
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Creates airtight seams for crawl space vapor barriers and encapsulation
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Ideal for overlapping, repairing, and securing polyethylene liners
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Designed to withstand humidity, temperature fluctuation, and foundation environments
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4-inch width provides wide coverage for stronger seam strength
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180 ft roll reduces seam interruptions on large crawl spaces
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Works with reinforced vapor barriers, underlayment, and radon liners
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Trusted by professional crawl space and moisture mitigation contractors