Quick answer
Water dripping from a bathroom exhaust fan is usually condensation: warm, wet shower air cools in an uninsulated duct running through a cold attic and runs back down to the fan. If it only drips during rain, the roof or wall cap where the duct exits is leaking instead. Switch the fan off at the breaker, note when it drips, and press the ceiling around the grille. Soft or stained drywall means the ceiling is wet and needs drying before any patch. Call (888) 840-6512 to reach a certified water damage restoration company in your area; the line is answered 24/7.
Written & reviewed by Marcus ReedIICRC WRT
Reviewed September 30, 2026· Next review Mar 2027
Water dripping from a bathroom exhaust fan comes from one of two places. Either the fan's own duct is full of condensation from warm, wet shower air that cooled on the way out, or rain is getting in where the duct leaves the roof or the wall. The timing tells you which. Either way, the ceiling around the fan is often wetter than it looks.
What to Do Now
- 1Turn off the fan at its breaker. Water is running through an electrical fixture. Switch off the circuit before you touch the fan, the switch or the grille.
- 2Catch the water and note when it drips. Put a towel or a bucket under the fan and write down whether it drips after showers, during rain, or on cold mornings. That one fact points to the cause.
- 3Look at the duct in the attic if you can reach it. Check whether the duct is insulated, sags between the fan and the outlet, or ends loose in the attic instead of outside. Check the roof or wall cap for gaps if it only drips in rain.
- 4Check the ceiling around the fan. Press the drywall around the grille and look for a brown ring or sagging paint. Soft or stained means the water has been going into the ceiling, not just out of the grille.
Condensation or Rain?
| When it drips | Likely cause | The fix |
|---|---|---|
| After showers, worse in winter | Condensation in an uninsulated duct running through a cold attic | Insulated duct, short and sloped toward the outside |
| Only during or after rain | Roof or wall cap leaking, or missing flashing | Roofer or exterior contractor reseals the cap |
| Constantly, fan never run | A leak above, following the duct to the fan | Find the real leak, often a roof or a pipe |
| Drips and the attic insulation is damp | Duct ends in the attic, not outside | The duct is extended through the roof or wall |
Condensation is the most common answer. A bath fan moves air that is close to 100% humidity. When that air travels through a cold, uninsulated duct, water forms on the inside and runs back down to the lowest point, which is often the fan housing. A duct that sags makes a trap where water pools until it spills.
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Why the Ceiling Matters More Than the Fan
The fan housing sits in a hole in the ceiling drywall, and the water that drips from the grille is only part of it. The rest runs across the top of the drywall and into the insulation. A duct that dumps into the attic wets the insulation and the roof deck every time someone showers. Wet drywall and insulation start growing mold in about 24–48 hours, and a bathroom ceiling is warm and humid to begin with. The mold on a bathroom ceiling page covers what that looks like from below.
Who Fixes What
An electrician or HVAC contractor reroutes, insulates or replaces the duct and the fan. A roofer reseals a leaking roof cap. If the drywall around the fan is soft, stained or sagging, or the insulation above is wet, a restoration company measures the ceiling, removes what cannot be dried, and dries the cavity before it is patched. Clean-water drying runs around $3–$7 per square foot.
If the ceiling around your bathroom fan is soft or stained, (888) 840-6512 is answered 24/7 and connects you with a certified restoration company that serves your area. The company gives you an arrival window for your address on the call, and there is no charge for the referral.
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Frequently Asked Questions
Why is water dripping from my bathroom exhaust fan?
Most often it is condensation. Shower air is nearly saturated, and when it passes through a cold, uninsulated or sagging duct in the attic, water forms inside and runs back to the fan. The other common cause is rain getting in at the roof or wall cap.
Why does my bathroom fan drip when it rains?
The cap where the duct leaves the roof or wall is leaking, its flashing has failed, or the duct is not connected to the cap. Rain runs down the duct to the fan housing.
Is water dripping from a bathroom fan dangerous?
Water is running through an electrical fixture, so switch the fan off at the breaker until it is fixed. The water can also soak the ceiling drywall and insulation around the fan.
How do I stop condensation in my bathroom fan duct?
Use an insulated duct, keep it as short as possible, slope it toward the outside so water drains out rather than back, and make sure it ends outside the house, not in the attic.
Can a dripping bathroom fan cause mold?
YesThe ceiling around the fan and the attic insulation above stay damp, and a bathroom is already humid. Wet drywall and insulation start growing mold in about 24–48 hours.
Who do I call right now for water damage?
Call (888) 840-6512. The line is answered 24 hours a day, seven days a week, and connects you with an IICRC-certified water damage restoration company that serves your area. Describe what you can see — where the water is coming from, how long it has been there, and whether it smells — the more specific you are, the faster the right company is on the line.
If the source is a pipe or an appliance, shut the main water valve first. Have four things ready and the call goes quickly: the address, when the water started, what is wet now, and whether you have filed an insurance claim.
Still not sure which of these is your situation? (888) 840-6512 · toll-free · answered 24/7
Sources
- IICRC S500 Standard for Professional Water Damage Restoration
- EPA — A Brief Guide to Mold, Moisture and Your Home
- EPA — Moisture Control Guidance for Building Design, Construction and Maintenance
Methodology: How we source and verify data · Report an error
Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.
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