Fix it
Why is my ceiling leaking when it rains?
A ceiling that only drips during or after rain almost always means water is getting past the roof or an exterior wall and traveling along framing until it finds a way down. The stain rarely sits directly under the entry point.
What it usually is
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Damaged or lifted shingles above the stain
Wind-lifted, cracked or missing shingles let rain reach the roof deck. Water then runs along rafters and drips onto the drywall far from the actual gap, which is why the wet spot moves around between storms.
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Failed flashing at a chimney, vent or valley
The metal flashing where the roof meets anything vertical is the most common leak point on an otherwise healthy roof. Sealant dries out and lifts in as little as a decade.
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Clogged drainage backing water under the roof edge
When runoff cannot get away at the eaves, it pools and wicks up under the bottom courses of shingles, showing up as stains near exterior walls.
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Wind-driven rain through attic vents
Heavy sideways rain can push through ridge or gable vents. These leaks appear only in major storms and often leave the insulation damp in a line below the vent.
Safety first: If the ceiling is bulging with water, sagging, or the leak is near a light fixture, cut power to that room at the breaker before touching anything.
What you can check yourself
From inside the attic with a flashlight, look for water tracks, damp insulation or daylight through the deck while it is dry. Mark the wet spots, then compare after the next rain. Put a bucket under active drips and poke a small drain hole in any bulging paint blister so water cannot pool inside the ceiling.
When it’s a job for a pro
Finding the true entry point usually takes a roof walk and moisture meter, and the ceiling side needs drying before mold sets in — insulation that stays wet more than a day or two should come out. A restoration partner can dry the cavity and a roofer can close the entry point.
Drying and repairing a water-stained ceiling typically runs $300 to $1,200 depending on how long it stayed wet; the roof-side repair is separate and often $200 to $800 for flashing or shingle work.
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