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Old 01-14-2018, 03:48 PM   #1
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2007 27' International CCD FB
San Diego , California
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Ventline Bathroom Fan - Sealant?

I'm trying to replace a bathroom Ventline fan as the motor is going out.

The replacement fan didn't come with a gasket for the roof. What do you guys recommend as sealant between the roof flange and roof?

I have Alpha System 1021 self leveling sealant which I'll likely use around the edge once it's installed, but should I use something else under the flange?
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Old 01-14-2018, 04:20 PM   #2
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I used butyl tape/caulk beneath the perimeter of the fan, then Trempro 365 around the perimeter and on the screw heads.
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Old 09-21-2018, 10:20 AM   #3
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I know the original post is months old but will chime in and say that when I replaced my bath fan I used vulkum to seal it.

When screwing the new fan to the roof, I tightened the screws down in an x pattern, sort of like torqueing valve cover bolts, and didn't tighten them all the way so not all the sealant was squeezed out.

That was many years ago. No leaks.
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Old 09-21-2018, 10:40 AM   #4
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Butyl under the flange and Parr around the outer edge.
You will be long gone before it leaks.
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Old 05-01-2019, 08:35 AM   #5
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My bathroom vent (2018) leaked during a very heavy rainstorm/wind.

It was the first instance and I've had the trailer only 7 months.

Before getting up there, what can I expect?

Thanks,
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Old 05-01-2019, 11:17 AM   #6
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If water came in during rain/wind when the lid was open, even slightly, that is normal. It's up to you to close it tightly when requried.
If water came in while the lid was closed tightly, then some re-sealing or replacing parts is in order.
Until someone gets up there and looks, it's just guessing. (could be sealant, cracked lid, stopped up drain slot, missing screw, debris wedged under the lid, etc)
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Old 05-02-2019, 07:19 AM   #7
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Yes, the vent was closed. No leaks in the shower. I'll get up there and compare the two.

Thanks,
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Old 05-06-2019, 12:14 PM   #8
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Just to close the circle, I did use Alpha System 1021 to seal around the perimeter, just like every other roof mounted item.

As I was servicing the fan, I replaced the upper cover and motor. The new cover came with a refreshed gasket. Motor was the same so I just installed the new motor and fan assembly within the same frame that was already in place.

No leaks, and runs as good as new.

Also took the opportunity to modify the fan with an aftermarket PWM speed controller. Best mod by far! I like to run my bathroom fan 24/7, and the new speed controller allows me to dial the fan to any speed, down to a whisper especially at night, with lower power draw.
http://www.airforums.com/forums/f455...od-191363.html
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