Air Sealing/insulating Flue In Attic? - 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 Search this Thread
Display Modes
Old 06-17-2015, 01:25 PM   #1
Member
 
Join Date: Aug 2006
Posts: 132
Rewards Points: 83
Default

air sealing/insulating flue in attic?


Getting ready to put more insulation in my attic and noticed the 12in x 12in chase for the water heater exhaust flue that extends into the attic is wide open. The furnace is high efficiency and so only the water heater uses this exhaust flue.

I was reading online about code for keeping insulation so many inches away from the exhaust flue but it sounded like it was for furnaces that exhaust into it (mine just has the water heater). The flue is not warm to the touch or anything ( and is currently wrapped in fiberglass and has been for 3 decades).

Any problems with air sealing the chase with foam board and putting insulation on top around pipe or is this still a code no-no?
AllGoNoShow is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-19-2015, 01:44 PM   #2
Newbie
 
BarryP's Avatar
 
Join Date: Jun 2015
Location: Michigan, mostly Alabama... everywhere else
Posts: 28
Rewards Points: 8
Default


If the flue is not introducing heat into the attic, then don't bother with it.
BarryP is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-20-2015, 12:15 AM   #3
Registered User
 
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526
Default


I'd use sheet metal/fire caulking at the flue sides, pp. 19/60; http://apps1.eere.energy.gov/buildin...ing_report.pdf

Check with local AHJ or Fire Marshall if insulating the chimney... seems it would temper the cold winter attic air from the warm exhaust gases which carry water that would condense on the pipe/flue sides quicker...

Gary
__________________
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
Gary in WA is offline   Reply With Quote
The Following User Says Thank You to Gary in WA For This Useful Post:
Dave Sal (07-07-2015)
Sponsored Links
Advertisement
 
Old 06-23-2015, 12:10 PM   #4
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 26,065
Rewards Points: 928
Blog Entries: 41
Default


+1

Sheet metal and itumescent caulking where it meets the chimney.
Windows on Wash is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


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
Attic insulation simagic Insulation 1 05-07-2014 12:06 AM
Insulation in the attic when the furnace is up there Jimmybrp Insulation 2 12-11-2011 02:26 PM
Attic - Replacing electrical - Positioning, how many boxes, checking understandings darlingm Electrical 12 12-04-2011 11:17 PM
Attic Fan AND Whole House Fan PapaGnome HVAC 6 02-15-2009 02:28 PM
Powered Attic Fan question spup345 Roofing/Siding 9 06-30-2008 08:10 PM




Top of Page | View New Posts