The answer to a damaged flat roof is that there are several common causes, including poor drainage, excessive foot traffic, UV damage, and age. Symptoms can include leaks, pooling water, cracks, and blisters. Solutions depend on the extent of the damage, but may include patching, coating, or complete roof replacement.
For minor issues, DIY repairs may be possible, but for more extensive damage or if you're unsure of the cause, it's best to call in a professional roofing contractor. They can properly diagnose the problem and recommend the most effective and long-lasting solution.