HVAC Ducting And Foam Insulation - HVAC - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 08-17-2009, 12:18 PM   #1
Newbie
 
Join Date: Jan 2007
Posts: 2
Rewards Points: 10
Default

HVAC ducting and foam insulation


I am a homeowner (not a contractor) and installed the ductwork on my remodel job. The ductwork was so tight above the bathroom (finished room above it) that, rather than using the fiberglass batt duct insulation that I used everywhere else, I asked the spray foam contractor to shoot the ductwork in the space above the bathroom with spray foam. The round metal ducts are screwed and sealed with mastic. Now of course the city hvac inspector is telling me this is a code violation and is telling me to scrape all the spray foam off the ductwork and wrap it with fiberglass. I understand that "the code is the code," but is there some drawback to using spray foam insulation on ductwork besides the difficulty I am going to have removing it? Is it approved anywhere??? thanks

Advertisement

seadrift is offline   Reply With Quote
Old 08-17-2009, 01:11 PM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,112
Rewards Points: 862
Default

HVAC ducting and foam insulation


I would think it is not rated for a high enough temperature. I have seen furnaces malfunction because of a faulty or miswired limit control and get hot enough to melt the A/C coil drain pan. Fibreglass is not as sensitive to high temp. Foam may gas off and release harmful vapors also.

Advertisement

yuri 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





Top of Page | View New Posts