TYPAR RA Rubberized Asphalt Window and Door Flashing Roll - 4"x75' Rubberized asphalt (RA) flashing is an affordable choice with best-in-class performance. Features easy peel-and-stick back release for easy positioning. For use on window flanges, sill plates, corners and joints to improve air and moisture hold-out. Recommended Exposure Limit: 180 Days