The answer to 'flat roof curling shingles' is that curling shingles on a flat roof are often caused by improper installation, age, or moisture damage. Symptoms include shingles that are lifting at the edges or corners, and the roof may start to look uneven or wavy. Solutions can include re-securing loose shingles, applying a roof coating or sealant, or in severe cases, replacing the entire roof.
If the curling is minor, you may be able to fix it yourself by re-adhering the shingles. However, for more significant damage or if you're unsure of the cause, it's best to call a professional roofing contractor to inspect the roof and provide the appropriate repair or replacement recommendation.