Why is water coming out of the bathroom vent fan?

Henry Langworth asked a question: Why is water coming out of the bathroom vent fan?
Asked By: Henry Langworth
Date created: Wed, Mar 31, 2021 5:45 AM

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FAQ

Those who are looking for an answer to the question «Why is water coming out of the bathroom vent fan?» often ask the following questions:

❔ Bathroom vent leaking when it rains water?

A leak from a bathroom vent when it rains should be investigated and repaired as soon as possible. A leaking bathroom vent is usually traceable to a problem with the vent cap or the vent flashing on the roof. If the vent cap is broken or loose, rain can infiltrate through the vent cap. Damaged flashing will allow rainwater under the roof covering.

❔ Why is my bathroom vent leaking water?

If the bathroom fan is dripping water when it rains, it means that the flashing or some part of the vent cover is allowing in water. It also may be that the damper (flap) is loose or missing --- and is allowing in water. In short, you will have to get someone onto the roof to fix it. Builder's Best Roof Vent Cap

❔ Bathroom sink water coming up in bathtub?

If you’re using the bathroom sink and then discover murky water from the bathroom sink backing up into the tub, again, it’s a sign that something could be blocking your main sewage line. To understand the scope of a sewer line blockage, it helps to understand how your drains connect to the main sewer line.

10 other answers

The problem might be the condensation in the cold duct. In most of the dripping water from the bathroom fan cases, this is the main culprit that you have to consider first. You may notice water dripping during or shortly after taking a shower. There is a good chance that there is condensation inside the duct.

The usual cause is condensation inside the duct. In winter, when the warm moist air from the bathroom hits cool air in the attic or outdoors, it condenses, sending drips back down the ductwork. In summer, humid outside air condensed on a pipe cooled with air conditioning will drip when humid bathroom air adds to the moisture level.

Vent is too close to the roof One can see where roofing tar has been painted all around the vent to create a “curb” to prevent water from running into the vent and into the roof structure.   In this case, the tar was not working and it was still leaking into the roof structure. Sometimes I find them nicely installed.

The water will flow through the vent cover, down the air duct, and out from the bathroom exhaust fan. Then you will have dripping water coming out of your exhaust fan. When the warm air makes contact with the snow and ice, these elements will melt into water. Water Dripping From Bathroom Exhaust Fan When it Rains

If the bathroom fan is dripping water when it rains, it means that the flashing or some part of the vent cover is allowing in water. It also may be that the damper (flap) is loose or missing --- and is allowing in water. In short, you will have to get someone onto the roof to fix it. Builder's Best Roof Vent Cap

For many years, contractors installed bath fan vent ducting incorrectly, creating a bend or low loop to catch condensation. This just allows water to accumulate and may cause a large leak when the water lets go.

During the winter, I experienced "Chinese water torture". The bathroom exhaust fan is located above the toilet. While seated on the throne, drops of water would hit my head every so many seconds. I traced it to the roof vent. It is a metal cap that gets cold in the winter. The mylar duct runs from the fan through the attic to the roof vent. Looking at the roof vent, I found this: That's an icicle on the right side, and little frozen rivers of water running from the base of the cap. Another ...

The water coming through the housing is undoubtedly condensation; the result of warm, humid air from the bathroom condensing on the inside of the pipe. Condensation is likely only a problem in the...

Ventilation in the bathroom is a very important issue because of the amount of air pollution, and especially water vapor. The bathrooms have excessive water vapor in the air. Excess air moisture in the bathroom is especially evident in the form of steamed glass and mirrors, but not only.

probably roughly centered in the bathroom ceiling. If you had very hard driving rain, what probably happened is the wind blew the rain into the draft hood on the roof, so it then ran down into the duct and came out at the bathroom fan.

Your Answer

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