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Attic Vent Fan & Horizontal Rain - Floirda Style!!!

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Attic Vent Fan & Horizontal Rain - Floirda Style!!! infiniteMPG 06-13-2008
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Posted by infiniteMPG on June 13, 2008, 12:08 pm
We had an old dome style vent fan in the roof and the motor had been
shot for a couple years. A few weeks ago we finally got around to
replacing the motor and replaced the dome, too (it came with it).
Yesterday evening we had some storms pass thru and when i got home and
checked, the rain gauge said 4-1/4" of rain had falled. The covered
porch was soaked and a neighbor's tree had fallen so I assume the
winds were pretty strong, too.

When I went in the house, directly under the vent fan I found there
was a wet spot in the sheet rock of the ceiling. I didn't have time
to crawl up and look directly but I am assuming that the winds were
blowing the rains as we so happy call it, in to "horizontal rain" when
it's going almost directly sideways at about 40mph. Had this happen a
couple times before and it looks like the wind actually whips the rain
up under the dome of the vent fan and it drips from under the fan down
onto the ceiling of the master bedroom. The attic cooks in the summer
so the fan is a great asset. And we just had the roof completely
redone a few years ago so I doubt there's any issues with that.

Does anyone know of a good way to prevent this from happening? A pan
under the fan? Add some extra material to the edges of the dome?

Thanks!

AppliancePartsPros.com, Inc.
Posted by Pipedown on June 13, 2008, 5:18 pm
You should have the same roofing contractor come out and give you advice. A
pan under the vent seems like it could work. If big enough,you might not
need a drain. It just needs to hold the drippings until it gets hot enough
again to evaporate the water. Some salt in the pan will inhibit scum and
mold. A bit of copper containing algicide (also a salt) will also work to
keep it from becoming a source of scum and mosquitoes. It could also be a
failure of the flashing around that vent.




> We had an old dome style vent fan in the roof and the motor had been
> shot for a couple years. A few weeks ago we finally got around to
> replacing the motor and replaced the dome, too (it came with it).
> Yesterday evening we had some storms pass thru and when i got home and
> checked, the rain gauge said 4-1/4" of rain had falled. The covered
> porch was soaked and a neighbor's tree had fallen so I assume the
> winds were pretty strong, too.
>
> When I went in the house, directly under the vent fan I found there
> was a wet spot in the sheet rock of the ceiling. I didn't have time
> to crawl up and look directly but I am assuming that the winds were
> blowing the rains as we so happy call it, in to "horizontal rain" when
> it's going almost directly sideways at about 40mph. Had this happen a
> couple times before and it looks like the wind actually whips the rain
> up under the dome of the vent fan and it drips from under the fan down
> onto the ceiling of the master bedroom. The attic cooks in the summer
> so the fan is a great asset. And we just had the roof completely
> redone a few years ago so I doubt there's any issues with that.
>
> Does anyone know of a good way to prevent this from happening? A pan
> under the fan? Add some extra material to the edges of the dome?
>
> Thanks!



Posted by Red Green on June 16, 2008, 10:13 pm

> You should have the same roofing contractor come out and give you
> advice. A pan under the vent seems like it could work. If big
> enough,you might not need a drain.

Mudd bucket. Board across the 2x's. Cheap and dirty.

This is assuming it's not a regular thing ever time it rains. Then it
need's some kind of fixin'.


> It just needs to hold the
> drippings until it gets hot enough again to evaporate the water. Some
> salt in the pan will inhibit scum and mold. A bit of copper
> containing algicide (also a salt) will also work to keep it from
> becoming a source of scum and mosquitoes. It could also be a failure
> of the flashing around that vent.
>
>
>
>
> ..
>> We had an old dome style vent fan in the roof and the motor had been
>> shot for a couple years. A few weeks ago we finally got around to
>> replacing the motor and replaced the dome, too (it came with it).
>> Yesterday evening we had some storms pass thru and when i got home
>> and checked, the rain gauge said 4-1/4" of rain had falled. The
>> covered porch was soaked and a neighbor's tree had fallen so I assume
>> the winds were pretty strong, too.
>>
>> When I went in the house, directly under the vent fan I found there
>> was a wet spot in the sheet rock of the ceiling. I didn't have time
>> to crawl up and look directly but I am assuming that the winds were
>> blowing the rains as we so happy call it, in to "horizontal rain"
>> when it's going almost directly sideways at about 40mph. Had this
>> happen a couple times before and it looks like the wind actually
>> whips the rain up under the dome of the vent fan and it drips from
>> under the fan down onto the ceiling of the master bedroom. The attic
>> cooks in the summer so the fan is a great asset. And we just had the
>> roof completely redone a few years ago so I doubt there's any issues
>> with that.
>>
>> Does anyone know of a good way to prevent this from happening? A pan
>> under the fan? Add some extra material to the edges of the dome?
>>
>> Thanks!
>
>


Posted by Red Green on June 16, 2008, 10:21 pm
f7972fd23b1f@f63g2000hsf.googlegroups.com:

> We had an old dome style vent fan in the roof and the motor had been
> shot for a couple years. A few weeks ago we finally got around to
> replacing the motor and replaced the dome, too (it came with it).
> Yesterday evening we had some storms pass thru and when i got home and
> checked, the rain gauge said 4-1/4" of rain had falled. The covered
> porch was soaked and a neighbor's tree had fallen so I assume the
> winds were pretty strong, too.
>
> When I went in the house, directly under the vent fan I found there
> was a wet spot in the sheet rock of the ceiling. I didn't have time
> to crawl up and look directly but I am assuming that the winds were
> blowing the rains as we so happy call it, in to "horizontal rain" when
> it's going almost directly sideways at about 40mph. Had this happen a
> couple times before and it looks like the wind actually whips the rain
> up under the dome of the vent fan and it drips from under the fan down
> onto the ceiling of the master bedroom. The attic cooks in the summer
> so the fan is a great asset. And we just had the roof completely
> redone a few years ago so I doubt there's any issues with that.
>
> Does anyone know of a good way to prevent this from happening? A pan
> under the fan? Add some extra material to the edges of the dome?
>
> Thanks!

4"+ at one shot. That's a lot of frikkin' rain! Even with torrential
downpours and gusty winds 4" is unusual (to me anyway).

It didn't happen with the old hood I take it. Does the new hood differ
much from the old one?

> replacing the motor and replaced the dome,

Isn't that called replacing the whole thing. Why would you say replaced
the motor and replaced the dome? What I'm getting at is is there some
part of the story missing here?

Posted by infiniteMPG on June 19, 2008, 11:31 am
> 4"+ at one shot. That's a lot of frikkin' rain! Even with torrential downpours
and gusty winds 4" is unusual (to me anyway).

We've had 21" of rain over 2-1/2 days before. When tropical front
move thru west central Florida we get dumped on... literally.

> It didn't happen with the old hood I take it. Does the new hood differ much
from the old one?

Actually it did happen a couple times with the old hood and they're
both the same (just different colors).

> Isn't that called replacing the whole thing. Why would you say replaced the
motor and replaced the dome? What I'm getting at is is there some part of the
story missing here?-

The metal duct work is mounted and tarred to the roof, set in the
shingled and all. I left the existing duct work there, replaced the
motor, the motor mount and the dome. The duct work from the earlier
fan remained so even though it's confusing I didn't replace the whole
thing, just the guts and the cover. The new and old one mounted the
same so it all matched up.

Was looking for something to mount under it in case this happens again
and think I found the solution. I found a pan they sell in Lowe's for
under hot water heaters. Pretty big aluminum pan with a hole and
fitting for a drain hose if needed. Can wire this under the vent fan
opening with heavy bailing wire and hook a hose ot tube to it if I get
worried about more rain then it can hold. The whole thing cost about
$8. I'll see how it goes.

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