chimney flashing detail roof

Chimneys, Parapets, and Vertical Walls: The Dual-Flashing Rule for Zero Wall Leaks

• September 12, 2026
• admin

When water stains appear on interior walls or upper-floor ceiling corners, homeowners usually assume a shingle has blown off or torn. Yet forensic roof inspections reveal that over 85% of interior wall-adjacent leaks originate at vertical masonry junctions—specifically where a sloping roof intersects a brick chimney, a parapet wall, a concrete stairhead tower, or a …