The answer to 'why is my roof water stains' is that water stains on your roof are usually a sign of a leak or moisture problem. Common causes include damaged or missing shingles, clogged gutters, poor roof ventilation, and excessive condensation in the attic.
Symptoms of roof water stains include discolored or stained shingles, peeling paint, mold or mildew growth, and water dripping from the ceiling. Left unaddressed, these issues can lead to structural damage and more expensive repairs down the line. In many cases, DIY fixes like sealing cracks or cleaning gutters may resolve the problem, but for more complex issues, it's best to call in a professional roofing contractor to properly diagnose and fix the root cause.