Tyvek Tape is strong, easy to use and highly waterproof. It helps to create a continuous building envelope system which keeps water and air out. Tyvek Tape helps to create a continuous building envelope system which keeps water and air out. Choose the best seam tape for sealing DuPont Tyvek weather barriers against air and water in both residential and commercial construction. Finish the building envelope with a superior seam tape - DuPont Tyvek Tape. Benefits can include not only better building durability but improved energy efficiency through reduced air leakage. Tyvek Tape is constructed of an oriented polypropylene film, coated with a specially formulated permanent acrylic adhesive to create the best adhesion between seam tape and DuPont Tyvek weather barriers.