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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-26-2012, 04:00 PM   #1
Newbie
 
Join Date: Jan 2010
Location: ohio
Posts: 4
Share |
Default

Duct seal or spray foam for suction lines?


Had a contractor replace stolen suction and liquid lines running from the condenser to the coil. Unfortunately, he did a hack job where the lines meet the furnace, it has been leaking condensation on the outside of the furnace do to improper insulation. I called him back, he came out and just added more foil tape and rubber insulation. I have since fixed the insulation problem, running it farther into the furnace and have cut new sheet metal to cover the opening. I am now left with a 1/4 gap (at most) around both lines after running new sheet metal. I am looking for recommendations on the best way to seal this gap. From all recollection, it seems like the duct seal (mastic) is used by most pros, where it is built up thick around the lines. But i am not sure if this is industry standard or just the jobs that I have seen. Anyone familiar with the proper way the seal this gap. Keep in mind this was an added a/c unit by a previous owner and it does/did not have the new suction line fittings like most newer ac/furnaces have.


Last edited by cjhaas24; 06-26-2012 at 04:10 PM.
cjhaas24 is offline   Reply With Quote
Old 06-26-2012, 04:03 PM   #2
Newbie
 
John @ OHFS's Avatar
 
Join Date: Jun 2012
Location: Philadelphia Region
Posts: 15
Default

Duct seal or spray foam for suction lines?


Can you jam more foam insulation into the gap? Then seal/caulk with mastic.

John @ OHFS is offline   Reply With Quote
Old 06-26-2012, 04:17 PM   #3
Newbie
 
Join Date: Jan 2010
Location: ohio
Posts: 4
Default

Duct seal or spray foam for suction lines?


I could add more insulation, but the gap really isn't the problem. I added the gap after wrapping the pipe so the sheet metal wouldn't cut into the insulation. With duct seal built up around the lines the way I have seen by hvac contractors, in my mind, it should cover the gap no problem. And that stuff is pretty thick, so it wont sag. I was more curious as to which one performs better for the seal or is used as a standard.

I appreciate your post and help!
cjhaas24 is offline   Reply With Quote
Old 06-26-2012, 04:58 PM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,032
Default

Duct seal or spray foam for suction lines?


I prefer to use permagum. Stays pliable. Easily removed if the cover ever has to be removed to clean the coil.

http://www.drillspot.com/tag/permagum-sealing-gum/
beenthere is online now   Reply With Quote
Old 06-26-2012, 08:34 PM   #5
Member
 
Join Date: Jun 2012
Posts: 210
Default

Duct seal or spray foam for suction lines?


i agree with beenthere, use permagum
hvac instructor is offline   Reply With Quote
Old 06-26-2012, 10:08 PM   #6
Newbie
 
Join Date: Jan 2010
Location: ohio
Posts: 4
Default

Duct seal or spray foam for suction lines?


Perfect! Thanks guys! That was exactly what I was looking for.
cjhaas24 is offline   Reply With Quote
Old 06-26-2012, 10:51 PM   #7
Part of the Clover Leaf
 
Join Date: May 2011
Location: NW Burbs of Detroit Mi.
Posts: 1,107
Default

Duct seal or spray foam for suction lines?


cork tape trumps permagum.

hvac5646 is offline   Reply With Quote
Reply

Tags
a/c lines, duct seal, insulation, spray foam, suction lines


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Spray foam insulation troyce1 Building & Construction 9 05-24-2011 06:57 PM
stone coated steel and spray foam insulation waternut Roofing/Siding 2 01-15-2011 06:36 PM
Tiger Foam On Duct Work atw58 Building & Construction 1 04-25-2008 10:25 PM
How Do I Install New Duct Lines For My Finished Basement? luweee HVAC 17 01-12-2008 03:01 PM
Condensation in Wall: Can I Seal a Dryer Duct With Caulk? xquercus HVAC 5 07-01-2007 02:33 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.