Use location and timing to separate finish movement, timber shrinkage and structural movement around grade, drainage, cracks, slab edges and below-grade moisture.
What the timing tells you
The phrase that changes seasonally is diagnostic context. Compare the symptom before, during and after that trigger.
What is special about this location
Grade, drainage, cracks, slab edges and below-grade moisture create pathways that are not visible from the finished room.
Start with competing explanations
Compare finish movement, timber shrinkage and structural movement. Do not select a cause from appearance alone.
First useful check
Use the linked check to create a timeline or pattern, then follow the strongest cause family to its full dossier.
Repair decision
Avoid cosmetic work until the source or mechanism is controlled and the original trigger no longer reproduces the symptom.
Observe→Compare triggers→Repair source→Verify outcome
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