Flashing edge opened under wind pressure
Rain crossed the weather layer only during a narrow wind direction.
↓House Autopsy · roof-envelope
The roof leak that travelled sideways
A ceiling stain appeared far from the failed flashing because water followed underlay, framing and a cable penetration.
Trigger conditionwind-driven rain
Four layers, one connected story.
Underlay carried water laterally
The first wet material was not directly above the visible stain.
↓A cable opening concentrated the drip
Water left the concealed path at the first easy downward opening.
↓Directional wetting confirmed the pathway
Controlled observation and subsequent storms no longer reproduced the stain after repair.
Canonical connection
The symptom and cause are separate objects.
The autopsy preserves how evidence connected them without collapsing uncertainty into one magic answer.
A ceiling stain appeared far from the failed flashing because water followed underlay, framing and a cable penetration.
The visible symptom was the final chapter
The investigation followed the source, transport path, affected material and verification step separately.
What changed the direction
Timing and location evidence ruled out attractive but weaker explanations before repair work began.
The durable lesson
Repair the controlling source and then verify the outcome under the conditions that previously triggered the symptom.
Source→Path→Damage→Verify
