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Roof flashing makes a watertight seal around chimneys, valleys, vents, and other areas where water can leak into your home. We recommend promptly resolving any problems with the roof flashing that come up.(Image: https://media.defense.gov/2024/Oct/30/2003575167/780/780/0/241029-A-AB280-1024.JPG)(Image: https://media.defense.gov/2017/Feb/01/2001693360/2000/2000/0/170125-F-RS980-051.JPG) If you can see roof decking or sheathing visible under your shingles, it means those shingles are severely curling or losing their seal and need to be replaced.