Bathroom Exhaust Fan Ductwork & Moisture

Reply

  #1  
Old 07-26-17, 09:08 PM
S
Member
Thread Starter
Join Date: Jul 2017
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
Bathroom Exhaust Fan Ductwork & Moisture

My current situation is flex duct running from the exhaust fan upwards to the attic roof and peeling bathroom ceiling paint. My goal is to install the proper (recommended) duct work (and after paint repair), to ensure the ceiling paint will not peel again. Any offerings of advice,etc. is both welcome and appreciated. Thank you.
 
Attached Images   
Sponsored Links
  #2  
Old 07-26-17, 09:23 PM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 33,583
Received 13 Votes on 11 Posts
Is it leaking moist air into the attic?
 
  #3  
Old 07-26-17, 09:27 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 26,197
Received 714 Votes on 661 Posts
The best scenario (imo) would be to keep the entire duct low... have the duct running straight down the floor joists in the opposite direction, buried in insulation so the pipe stays warm (your attic is severely underinsulated) then a tee would be installed under the roof sheathing with a cap on the bottom portion of the tee (to catch and hold any condensation where it could eventually evaporate) and then duct up the tee a few inches into a louvered 4" Lomanco roof vent. And use solid pipe, not flex.

Or, if you prefer, duct it downward out the soffit, provided there are no soffit vents within 3 ft of it. The original paint was probably a gloss oil, since covered with latex and the two don't bond well.

I expect the paint is failing because of the cold underinsulated ceiling v.s. the high humidity in the bathroom ceiling and condensation after a shower.
 
Reply
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


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: