Grace Vycor Plus Self-Adhered Flashing 9" x 75' roll provides superior protection against water, air and moisture infiltration in critical detail areas such as window and door openings, corner boards, under stucco finishes, masonry walls and other flashing areas, Do not use on roofs, It is 25 Mil thick and compatible with wood, plywood, oriented strand board, concrete and masonry, Fully adheres to the substrate to prevent water from passing through, shrink wrapped rolls.