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Should you be able to lift shingles up?
However, in most cases, replacing the curled/lifted shingles is the ideal way to get your roof back in functional shape and aesthetics. But if your roof has maxed out its useful life and almost all the shingles are curling or lifting, you are likely a candidate for a full roof replacement.
Are ridge cap shingles necessary?
Since asphalt shingles are more prone to wear and tear compared to metal roofing, it’s even more critical to have ridge cap shingles in place to stop rain and moisture from penetrating. For unique roof designs and sizes, it’s possible to cut regular shingles to create special ridge caps.