The short answer
A brown ceiling stain means water is getting into the structure, and the entry point is almost never directly above the stain. Water runs along rafters and decking before it drops. If the stain is damp, soft, or growing, treat it as active and get it looked at within a few days.
What causes it
| Cause | How you can tell | How common |
|---|---|---|
| Roof penetration failure | Stain sits near a vent pipe, chimney or skylight line | Most common |
| Failed pipe boot | Round stain in a hallway or bathroom ceiling | Very common past year 10 |
| Flashing at a wall or valley | Stain follows a straight line or appears near an interior wall | Common |
| Attic condensation, not a leak | Stain appears in winter with no rain, often widespread | Seasonal |
| HVAC drain pan overflow | Stain under or near an attic air handler, appears in summer | Often mistaken for roof |
| Ice damming at a low slope | Stain appears only after a hard freeze and thaw | Rare but real here |
How fast do you need to act
Call within a few days if the stain is damp or growing. Call the same day if the ceiling is sagging, bulging or dripping, because that is water pooling above drywall and it can come down.
What to do right now
- Photograph the stain with something for scale, and note the date
- Check the attic directly above with a flashlight, looking for wet decking or daylight
- Put a container under it and, if it is bulging, pierce the low point with a screwdriver to drain it in a controlled way
- Do not paint over it until the source is fixed, because paint hides the evidence a roofer needs
- Note whether it appears only during rain, only in winter, or constantly
What we see in the Hill Country
In the Hill Country the single most common source we find is a cracked pipe boot. The rubber collar around plumbing vents dries and splits in Texas UV, usually somewhere between year 8 and year 12, well before the shingles themselves are finished. It is an inexpensive repair when it is caught as a stain and an expensive one when it is caught as a collapsed ceiling.
When to call us
We inspect for this at no charge across Boerne, San Antonio, New Braunfels, Kerrville, Fair Oaks Ranch, Bulverde, Helotes, Spring Branch, Austin and Stone Oak. You get photographs of what we find and a written explanation, including when the honest answer is that nothing needs doing yet. Call (210) 245-4125 or book an inspection.
