The answer to 'flashing water stains' is that water stains on flashing are a common roofing issue caused by improper installation, damage, or deterioration of the flashing. Flashing is the metal or plastic material used to seal roof joints and transitions, preventing water leaks. Water stains indicate that water is getting through the flashing and into the home, which can lead to further damage if not addressed.
Common causes of flashing water stains include cracked, damaged, or missing flashing, improperly sealed flashing joints, and deterioration over time. Symptoms include visible water stains, discoloration, or moisture around the flashing. Solutions may involve re-sealing, repairing, or replacing the flashing, depending on the extent of the issue.