Why Is The Roof Vent On My Bathroom Fan Leaking

We have inspected the attic and there is no rotting wood and we cannot figure out how to stop the problem.

Why is the roof vent on my bathroom fan leaking.

I recommend replacing the vent pipe with insulated vent pipe. Most bath vents for homes are 3. I see many questions about leaking bath exhaust vents. This is especially true with those mushroom looking roof vents.

It seems like it may be coming in through the vent when the rain wind blows sideways during a heavy rain fall. In the unfortunate chance that you have a roof vent style that can let water in through its sides then this could be a reason why it s leaking during a hard rain. If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct. To find the problem and fix it you must keep your head cool.

Water stains on the ceiling around your bath fan may indicate a leak coming from the vent cap on your roof but condensation is the more likely culprit. The roof vent the vents that are used on the roof to vent fans are known as goose necks. They are larger than the pipe that they vent so that the air flow is not restricted. I check the operation of bath fans by just putting my hand at the exhaust and making sure air is blowing out after first checking for wasp nests of course.

About one third of the fans that are supposed to be exhausting through the roof are exhausting to a cap with a backdraft damper that is stuck closed which causes a good portion of the. I have checked the bathroom fan seal as well and it is not condensation because it is only during heavy rains. You may think there is something wrong with the exhaust fan but this is not always true. Next make sure you have one of the new roof exhaust vents on the roof and properly sealed.

Besides the roof it is also possible though unlikely that your bathroom fan vent goes to the exterior vertical wall and it may have just enough slope that water is still dripping through vent hose and into your bathroom. The roof vent pipe is installed cut through the roof and around the pipe attached to the roof is surrounded with rubber boot as insulation for the gap between the pipe and roof. The first step is to head to the attic. A good roofing contractor would have installed a roof vent that prevents water intrusion.

My recommendation for a replacement roof vent cover is the builder s best roof vent cap. There are many possible parts of the roof potentially leaking but one of the most common ones is the area around the roof vent. They rise up from the roof deck about six or seven inches curving down toward the roof to vent the air down toward the roof deck looking somewhat like a gooses head. So don t get angry with your expensive bathroom fan yet.