FIBERWEB TYPTAPE TYPAR CONSTRUCTION TAPE 55 YARDS 1-7/8 x 55 Yards A strong, coated polypropylene film that seals seams and edges to ensure the integrity of the building envelope. Use it on window flanges, corners, joints and seams to improve the building envelope and air and moisture holdout. Wont deteriorate over time providing years of reliable performance. Typar Tape Is UVand weather resistant