Roof flashing plays an important role in directing water away from vulnerable areas such as roof joints, walls, vents, skylights, and masonry structures. When roof flashing becomes loose, cracked, corroded, or improperly sealed, moisture can enter beneath roofing materials and cause hidden damage. Early signs may include water stains, damp insulation, peeling paint, or leaks appearing... https://redbrickmasonry.ca/roof-flashing-repair-guide/