Ideas Of Venting A Bathroom Fan In Attic - Building & Construction - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 01-12-2012, 01:16 PM   #1
Newbie
 
Join Date: Jan 2012
Posts: 11
Rewards Points: 10
Default

ideas of venting a bathroom fan in attic


Hi im about to finish my attic remodel and i have read several posts on the chatroom about venting . I dont want to go thru my roof and ive read not to do that because of moisture coming back into bathroom. Ive also read not to vent thru my soffit cause it can cause damage to the roof plus mold and moisture issue under eave . I havent heard to much negativity for goin out the side of the house which i can do. any input would be great. thank you Dave

Advertisement

david szela is offline   Reply With Quote
Old 01-12-2012, 01:22 PM   #2
Member
 
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,847
Rewards Points: 1,000
Default

ideas of venting a bathroom fan in attic


Through the roof is the safest. You won't have water problems if it is done properly. Going out the side may not get moisture away from the house, esp if you are near the eaves.

Advertisement

jklingel is offline   Reply With Quote
Old 01-12-2012, 02:53 PM   #3
Member
 
Join Date: Oct 2009
Location: Minneapolis, MN
Posts: 512
Rewards Points: 524
Default

ideas of venting a bathroom fan in attic


Going through the roof is A-OK. You must have misread those posts.

Is there anywhere you can tie in with an existing vent that already goes through the roof? Punching a new vent through the roof should be a last resort.

B
Beepster is offline   Reply With Quote
Old 01-12-2012, 03:04 PM   #4
Member
 
Join Date: Jun 2008
Posts: 855
Rewards Points: 526
Default

ideas of venting a bathroom fan in attic


just wondering cause I dont know. Can you tie it into the plumbing stack vent?
4just1don is offline   Reply With Quote
Old 01-12-2012, 03:20 PM   #5
MarginallyQualified
 
Join Date: Dec 2011
Location: Winston-Salem NC
Posts: 3,786
Rewards Points: 2,246
Default

ideas of venting a bathroom fan in attic


Quote:
Originally Posted by 4just1don View Post
just wondering cause I dont know. Can you tie it into the plumbing stack vent?
No.
This will require a separate hole in the roof, properly flashed of course,
for the vent housing to be installed. THEN you can attache the vent hose from the bathroom(s) to that.

hth

below is a nice picture of such:
Attached Thumbnails
ideas of venting a bathroom fan in attic-broan_ventilation_install.jpg  

Last edited by TarheelTerp; 01-12-2012 at 03:22 PM.
TarheelTerp is online now   Reply With Quote
Old 01-12-2012, 05:57 PM   #6
Member
 
Join Date: Oct 2009
Location: Minneapolis, MN
Posts: 512
Rewards Points: 524
Default

ideas of venting a bathroom fan in attic


Ohhhhhhhh, you are talking fan vent, not DVW vent...what he said.
Beepster is offline   Reply With Quote
Old 01-12-2012, 06:59 PM   #7
Newbie
 
Join Date: Jan 2012
Posts: 11
Rewards Points: 10
Default

ideas of venting a bathroom fan in attic


the problem with going thru the roof that i read was that the condensation will go back down into the bathroom / fan because the vent is directly above it and that is true because it happened to a friend of mine .maybe if there is a bend or not just straight above it. it wouldnt be a problem. he does have an older fan
david szela is offline   Reply With Quote
Old 01-12-2012, 07:41 PM   #8
MarginallyQualified
 
Join Date: Dec 2011
Location: Winston-Salem NC
Posts: 3,786
Rewards Points: 2,246
Default

ideas of venting a bathroom fan in attic


Quote:
Originally Posted by david szela View Post
the problem with going thru the roof that i read was that the condensation will go back down into the bathroom...
a) it's not an issue
b) if you think it matters then do the side wall vent option
TarheelTerp is online now   Reply With Quote
Old 01-12-2012, 10:58 PM   #9
Member
 
Join Date: Dec 2011
Location: B.C. Canada
Posts: 2,055
Rewards Points: 1,030
Default

ideas of venting a bathroom fan in attic


My last HVAC guy said the best was to go down an interior wall and out the floor joists. Said cold air could not come up it. Also insulated where it was in the floor joists. Not always possible in renovations.
mae-ling is offline   Reply With Quote
Old 01-13-2012, 11:55 PM   #10
Registered User
 
Join Date: Mar 2009
Posts: 9,974
Rewards Points: 2,014
Default

ideas of venting a bathroom fan in attic


Be sure the ducting is insulated and supported well. The elbows need foil tape on each segment, even the unused ones. (The cheaper elbows tend to fall apart wetting your attic insulation....). Use a few 45's right at the start to gain any needed pitch in the longer run as said. I can remember 4-5 mentions (here) of the condensation problems with roof exhaust...and duct was insulated. Insulate the fan box itself.

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is online now   Reply With Quote
Old 01-14-2012, 07:06 AM   #11
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 7,650
Rewards Points: 2,614
Default

ideas of venting a bathroom fan in attic


Quote:
Originally Posted by david szela View Post
the problem with going thru the roof that i read was that the condensation will go back down into the bathroom / fan because the vent is directly above it and that is true because it happened to a friend of mine .maybe if there is a bend or not just straight above it. it wouldnt be a problem. he does have an older fan
The LAST thing you want to do is put warm moist air in your attic.

If the fan does not have enough velocity, I could see how maybe that might happen.

Insulating the pipe in the attic would help cut down any condensation in the pipe. Of course, a side exit would be your best option to eliminate condensation coming back.

If your looking for a fan now, pay attention to the CFM and Sones (noise). There are charts out there that suggest what CFM you need for a given size bathroom. And getting a quiet fan reduces the irratation factor. I personally hate loud bathroom fans.

Advertisement

__________________
Even if you are on the right track, you will still get run over if you just sit there.

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ideas on reinforcing attic joists PhaTea Building & Construction 22 12-07-2011 10:41 PM
Newbie questions on refinishing walkup attic with knee walls FileOpen Insulation 2 11-20-2011 12:31 AM
Attic project - Would like opinions whataboutj Insulation 6 06-29-2011 04:07 PM
Attic mold? venting into attic? therompster HVAC 4 06-03-2011 07:18 PM
Bathroom Venting on Septic System edro Plumbing 2 01-03-2011 08:41 AM




Top of Page | View New Posts