Problem diagnosis
What's wrong?
Describe what you're seeing. I'll ask 1-3 clarifying questions and then give you a probable cause, severity, what to do right now, and what to ask your contractor.
Educational only. For structural, electrical, plumbing, gas, or active-leak issues, get a licensed pro on site. Photos and descriptions can mislead.
Start with the symptom and where you're seeing it. Example: "Water stain showing up on the kitchen ceiling under our master bathroom. Started 3 days ago."