Vapor Barrier seam tape is used for binding the seams of a moisture barrier when encapsulating a crawl space. Also great for covering staples or vapor barrier stakes for a finished look. This UV-resistant polyethylene film tape can also be used for masking surfaces during stucco application and painting, and can also be used for surface protection, color-coding, splicing and seaming on pipe-fitting covers. It also works well under floating floors, carpet padding and more! 4 Inches Wide x 180 Feet Long. 9 Mil Thick.