Symptom dossier

Diagonal crack above a door

A diagonal crack can follow a drywall joint, local frame movement or broader settlement; change over time matters most.

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Urgency profileInvestigate

Use timing, location and checks to separate competing explanations.

Track rather than guess

Record width, direction, endpoints and whether doors have begun to bind.

Observe→Distinguish→Control source→Verify

Living dossierPublished knowledge is connected and improved as new cases, images and outcomes are added. Updated 2026-07-20.