Which one is it?
| Clue | Likely source | Who to call |
|---|---|---|
| Appears or grows after rain | Roof, flashing or a vent boot | Roofer or remodeler |
| Under a bathroom, grows after showers | Shower pan, drain or supply line | Plumber, then a remodeler |
| Near the AC unit or a vent, in summer | Clogged condensate drain or overflowing pan | HVAC technician |
| Near an exterior wall or window | Window flashing or siding leak | Remodeler |
What to do right now
- If the ceiling sags, put a bucket under it and poke a small hole to drain it, so it doesn’t collapse.
- Turn off water to a leaking fixture, or the AC if the drain pan is overflowing.
- Take photos for insurance before you clean up.
- Dry the area quickly; wet drywall and insulation can grow mold within 24–48 hours.
The repair
Once the source is fixed, wet insulation and stained drywall are cut out and replaced, then the ceiling is textured to match and primed with a stain-blocking primer so the mark doesn’t bleed through new paint. If the leak came from a shower, the shower often needs to be rebuilt with a proper waterproofing membrane.
Common questions
Can I just paint over a ceiling water stain?
Only after the leak is fixed and the drywall is dry and solid. Use a stain-blocking primer first, or the stain will bleed through. Soft or sagging drywall needs replacing.
Does homeowners insurance cover a ceiling leak?
Often it covers sudden, accidental water damage but not long-term leaks or wear. Check your policy and report it promptly.
Sources
- EPA: A brief guide to mold, moisture and your home
- Texas Department of Insurance: After hail or windstorms
This guide is general information, not legal, tax or financial advice. Rules change; confirm details with the agency named in the sources or a licensed professional.