The line followed a finish joint
Its path was constrained by board layout rather than masonry or foundation geometry.
↓House Autopsy · structure-and-finishes
The crack that was a joint, not settlement
A recurring straight crack followed a board joint and seasonal movement while doors and floor levels remained stable.
Trigger conditionseasonal humidity change
Four layers, one connected story.
Width varied slightly by season
Repeated measurements showed a small reversible range.
↓No companion movement appeared
Doors, floors and exterior openings did not develop related symptoms.
↓Tracking separated cosmetic recurrence from progressive movement
The repair strategy changed once the joint behavior was documented.
Canonical connection
The symptom and cause are separate objects.
The autopsy preserves how evidence connected them without collapsing uncertainty into one magic answer.
A recurring straight crack followed a board joint and seasonal movement while doors and floor levels remained stable.
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
