The answer to 'roof water stains' is that they are a common issue caused by various factors, including leaks, condensation, and improper ventilation. These stains can appear on the interior or exterior of your roof and are often a sign of a larger problem that needs to be addressed.
Some common causes of roof water stains include damaged or missing shingles, clogged gutters, poor attic insulation, and issues with the roof flashing. Symptoms may include discoloration, mold or mildew growth, and water damage to the ceiling or walls. To address the problem, you may need to repair or replace damaged roofing materials, improve ventilation, or address any underlying leaks. In some cases, it's best to call a professional roofing contractor to properly diagnose and fix the issue.