Wet Spot on the Ceiling: What It Means
Short answer
A wet ceiling spot means water is entering the cavity above — from a plumbing line, an AC condensate drain, or the roof. Note when the spot grows: during rain, when the AC runs, or when a fixture upstairs is used.
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Track the pattern
- Grows during rain → roof, flashing, or window
- Grows when the AC runs → condensate drain line or pan
- Grows after showers or laundry upstairs → plumbing supply or drain
- Constant slow growth → pressurized supply line leak
Why not to wait
Even a small persistent leak saturates insulation and framing. In a humid climate, that reliably leads to mold, and repair costs rise sharply once the structure is affected.
Frequently asked questions
Should I cut open the ceiling?
A small inspection opening is sometimes the fastest way to find the source, but do it only after cutting power to the area — or let the professional make the opening as part of the diagnosis.
Get this in front of a local plumber
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