Need to vent bathroom fans through roof.

Can I use PVC pipe? (I just know how to use PVC, and am horrible with
metal ducting.)

Jack wrote:
Need to vent bathroom fans through roof.

Can I use PVC pipe? (I just know how to use PVC, and am horrible with
metal ducting.)

Yes, you can use PVC pipe, but you still need to use a roof cap. You
can't put the PVC pipe through the roof with a boot like you would with
a plumbing vent.

Ken

I redid the roof last year, an I installed a tin flashing with the
round rubber seal kind of thing.. in anticipation of bringing the vent
up through the roof and through the flashing/rubber seal... Are you
saying that is not a good idea?

Jack wrote:
I redid the roof last year, an I installed a tin flashing with the
round rubber seal kind of thing.. in anticipation of bringing the vent
up through the roof and through the flashing/rubber seal... Are you
saying that is not a good idea?

If I understand you correctly, that is a bad idea. Rain will come in
that way. Of course this is OK for a plumbing vent, because all the
rainwater will do is run down the drain. If this is for a fan that
vents the moist air to the outside, then whatever amount of rainwater
that goes down the pipe stuck through the roof will start coming in
through your bathroom fan. That's the reason for for a roof cap, to
let the moist air out while preventing rain, snow, leaves, etc from
coming in through the vent.

Something like this is what you want:

http://www.rewci.com/4alrocapwiba.html

Ken

"Jack" wrote in message
oups.com...
Need to vent bathroom fans through roof.

Can I use PVC pipe? (I just know how to use PVC, and am horrible with
metal ducting.)

Are you in an area that freezes? If so you might want to rethink the
plastic idea. But then again vents are stubbed through in plastic. Around
here at least.

yes, I am in area that freezes.. what would the problem be.. there
would be nothing but air and vapor in the pipes... what am I missing

"Jack" wrote in message
ups.com...
yes, I am in area that freezes.. what would the problem be.. there
would be nothing but air and vapor in the pipes... what am I missing


Run your PVC, its ok to do...when you get to the roof, extend it up, and put
a couple of street 90s on it to make a nice 180 facing back down, to keep
water out of it.

On Wed, 30 Nov 2005 14:04:20 -0500, "CBHVAC"
wrote:


"Jack" wrote in message
oups.com...
yes, I am in area that freezes.. what would the problem be.. there
would be nothing but air and vapor in the pipes... what am I missing


Run your PVC, its ok to do...when you get to the roof, extend it up, and put
a couple of street 90s on it to make a nice 180 facing back down, to keep
water out of it.

The metal ducts from my bathroom fans go to within 6 inches of the
ridge vent, and then terminate, INSIDE the roof. Is that ok?
Maryland.

They're not exactly vertical, one leans forward and the other
backwards, both towards the ridge line of the house, so they are only
about 4 inches apart where they terminate.



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mm wrote:
The metal ducts from my bathroom fans go to within 6 inches of the
ridge vent, and then terminate, INSIDE the roof. Is that ok?
Maryland.

They're not exactly vertical, one leans forward and the other
backwards, both towards the ridge line of the house, so they are only
about 4 inches apart where they terminate.


No, it's not OK. It's a fairly common hack job, but you get way more moisture
inside the attic than you should. Mold, mildew, rot -- bad mojo all around.

"mm" wrote in message
...
On Wed, 30 Nov 2005 14:04:20 -0500, "CBHVAC"
wrote:


"Jack" wrote in message
roups.com...
yes, I am in area that freezes.. what would the problem be.. there
would be nothing but air and vapor in the pipes... what am I missing


Run your PVC, its ok to do...when you get to the roof, extend it up, and
put
a couple of street 90s on it to make a nice 180 facing back down, to keep
water out of it.

The metal ducts from my bathroom fans go to within 6 inches of the
ridge vent, and then terminate, INSIDE the roof. Is that ok?
Maryland.

They're not exactly vertical, one leans forward and the other
backwards, both towards the ridge line of the house, so they are only
about 4 inches apart where they terminate.


Nope...its not ok.
Run them out, and do it the correct way, unlike teh way the original
installer did.



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On Sat, 3 Dec 2005 11:39:13 -0500, "CBHVAC"
wrote:


"mm" wrote in message

The metal ducts from my bathroom fans go to within 6 inches of the
ridge vent, and then terminate, INSIDE the roof. Is that ok?
Maryland.

They're not exactly vertical, one leans forward and the other
backwards, both towards the ridge line of the house, so they are only
about 4 inches apart where they terminate.


Nope...its not ok.
Run them out, and do it the correct way, unlike teh way the original
installer did.

Thanks to both of you for the help. It will have to wait until
spring.


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