Insulating Short Stretch Of Circular Duct That Has Damper - Insulation - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation

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

Reply
 
Thread Tools
Display Modes
Old 07-12-2014, 01:50 PM   #1
Member
 
Join Date: Apr 2007
Posts: 2,316
Rewards Points: 1,062
Question

Insulating short stretch of circular duct that has damper


I have a condensation and drip page problem where my 8" exposed circular AC duct comes out of the ceiling. Above the ceiling is the attic, meaning it gets pretty hot. As you can see in the pictures, the small (maybe 6-9") stretch of the pipe between the plenum box above and where it comes out of drywall (will come out of drywall) is uninsulated, the guy left it like that because a damper is there that I want to have access to through a future small panel door. So he couldn't just wrap around because the damper was in the way. I didn't think leaving it like that could cause condensation but it does.

My question is, is there some kind of (preferably self-adhesive) insulation tape that I can apply around all but the leeway of the damper to prevent or reduce condensation? Or would you recommend something else?
Attached Thumbnails
Insulating short stretch of circular duct that has damper-imag0144.jpg   Insulating short stretch of circular duct that has damper-imag0145.jpg  

Last edited by amakarevic; 07-12-2014 at 01:54 PM.
amakarevic is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-12-2014, 09:21 PM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 21,523
Rewards Points: 6,748
Blog Entries: 40
Default


I would build a box out of foam that is above the damper on the attic side and seal it to the attic floor.

Seal all the connections in the line with mastic as well.
Windows on Wash is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Tags
condensation , duct , hvac , insulation , pipe


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
insulating duct work in basement Master Brian HVAC 10 05-19-2009 11:28 AM
Insulating a return duct ? iMisspell HVAC 2 12-03-2008 01:47 AM
Condensation in Wall: Can I Seal a Dryer Duct With Caulk? xquercus HVAC 5 07-01-2007 03:33 PM
closing circular duct steve6 HVAC 7 02-22-2007 09:06 PM
Insulating duct run in vented crawlspace Magus HVAC 2 11-29-2006 04:09 PM




Top of Page | View New Posts