25 Roof Leak Warning Signs (With Photos) — When to Call a Roofer for Repair

Moment #10: Chimney flashing gaps and cracked sealant

Chimneys create multiple seams where water can enter—step flashing, counter-flashing, and sealant joints. Lifted edges or cracked sealant can cause “mystery leaks” that appear far from the chimney itself. If leaks occur after heavy rain or wind, this is a prime suspect area. Small flashing repairs can prevent major damage to roof decking and interior drywall near the chimney line.