Heavy Duty Vapor Barrier Seam Tape for Crawl Space and Marine Use. This heavy duty 60 yard roll of moisture resistant crawl space vapor barrier seam and seal tape is highly durable, waterproof and weatherproof. It features a 9 mil thick poly film, backed by a synthetic rubber adhesive, that is used for binding the seams of a moisture barrier when encapsulating a crawlspace. Plus, it's great for covering staples or vapor barrier stakes for a finished look. UV-resistant polyethylene film tape can also be used for masking surfaces during stucco application and painting, abatement and restoration, home and office renovation, boat and marine preservation, patching and repairs, surface protection, color-coding, splicing and seaming on pipefitting covers. It's highly versatile! It also works well as an underlayment under floating floors, carpet padding and more! Product Specifications: 4 Inches Wide x 180 Feet Long. 9 Mil Thick. Our tape is made from the best materials and quality available.