DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Insulation and Radiant Barriers > Insulating Rim Joist Question




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 02-08-2014, 06:53 PM  
Great_North
Junior Member
 
Join Date: Jan 2014
Posts: 5
Default Insulating Rim Joist Question

I have a question about insulating the rim joist in my basement ceiling. House is only 8 years old and we’re plugging away on finishing the basement and are at the ceiling now. I plan on just adding fiberglass rolls/batts between the joists and have had non-faced fiberglass in the rim area (see photos) since new without any issues. Before I do anything else, I want to know if fiberglass in the rim area is sufficient or is there a better way? I’m thinking spray foam would be better but cost is a factor as always. I just want to do this once and don’t want to have to worry about it again 5, 10, 20 years down the road so I want to make sure I do it right. Foundation walls are poured and we live in the northern Midwest and have very cold winters, below zero air temps are very common.

Also in using the fiberglass rolls/batts between the joists I’m assuming unfaced friction fit would be fine? Or would I want kraft faced?

Thanks for any help or feedback!


ins1.jpg   ins2.jpg   ins3.jpg  
__________________
Great_North is offline  
 
Reply With Quote Quick reply to this message
Old 02-08-2014, 09:03 PM  
kok328
Supporting Member
HRT_SUPPORTER.png
 
Join Date: Nov 2007
Location: Grand Blanc, MI
Posts: 2,150
Liked 95 Times on 84 Posts
Likes Given: 60

Default

I believe, per fire code you have to use unfaced.
Friction fit is ideal as compressed insulation has less rated R-value.

Curious as to how you finished your walls (vapor barrier, insulation, furring strips, etc...)



__________________
kok328 is offline  
 
Reply With Quote Quick reply to this message
Old 02-09-2014, 07:08 AM  
Great_North
Junior Member
 
Join Date: Jan 2014
Posts: 5
Default

Thanks kok. Do you mean for the rim joist areas on the ends of the joists or for the entire joist? Walls are poured with studs attached and insulated with unfaced fiberglass then the drywall. A 4mm plastic vapor barrier is installed on the subgrade portion extending 12" (I think) above grade between the drywall and insulation/studs. No vapor barrier is install on the above grade portion other than the first 12".

__________________
Great_North is offline  
 
Reply With Quote Quick reply to this message
Old 02-09-2014, 12:25 PM  
kok328
Supporting Member
HRT_SUPPORTER.png
 
Join Date: Nov 2007
Location: Grand Blanc, MI
Posts: 2,150
Liked 95 Times on 84 Posts
Likes Given: 60

Default

any exposed insulation has to be unfaced

__________________
kok328 is offline  
 
Reply With Quote Quick reply to this message
Old 02-10-2014, 10:12 AM  
Great_North
Junior Member
 
Join Date: Jan 2014
Posts: 5
Default

Thanks. As far as material between the joists for more noise reduction throughout the entire ceiling what would you recommend? I can get a bunch of R30 12" thick unfaced rolls from a buddy for almost nothing so was thinking of using that...? Thanks.

__________________
Great_North is offline  
 
Reply With Quote Quick reply to this message
Old 02-10-2014, 10:58 AM  
nealtw
Senior Member
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,021
Liked 691 Times on 617 Posts
Likes Given: 1214

Default

Depending on code where you live, where I am the vabout barrier would go from the floor to the floor above btween the floor joist and seal with accustic sealer any and all edges.
The r30 for the ceiling should work fine.

__________________
nealtw is online now  
 
Reply With Quote Quick reply to this message
Old 02-12-2014, 10:19 AM  
Great_North
Junior Member
 
Join Date: Jan 2014
Posts: 5
Default

Thank you!

__________________
Great_North is offline  
 
Reply With Quote Quick reply to this message
Old 02-12-2014, 10:29 AM  
nealtw
Senior Member
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,021
Liked 691 Times on 617 Posts
Likes Given: 1214

Default

Before you hide that insulation at the rim joist, check it for dirt. Dirty insulation is a sign of air leaking, find any holes and caulk them, fire rated caulk.

__________________
nealtw is online now  
 
Reply With Quote Quick reply to this message
Old 02-13-2014, 11:20 AM  
Great_North
Junior Member
 
Join Date: Jan 2014
Posts: 5
Default

Will do. Thank you!

__________________
Great_North is offline  
 
Reply With Quote Quick reply to this message
Old 04-03-2014, 10:27 AM  
drewdin
Junior Member
 
Join Date: Aug 2012
Posts: 389
Liked 23 Times on 21 Posts
Likes Given: 77

Default

when do you need a vapor barrier in the basement ceiling? I plan on insulating my basement ceiling also, the kitchen is above. The basement is not finished, would i still need a vapor barrier against the subfloor above? I didn't plan on using one, thx



__________________
drewdin is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

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 On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Garage Insulating Question redskinfan78 Insulation and Radiant Barriers 3 07-31-2013 04:00 PM
insulating the attic in my cape cod question daddymikey1975 Insulation and Radiant Barriers 3 08-15-2012 03:57 PM
floor joist question JeremyB Framing and Foundation 11 01-28-2012 02:44 PM
Ceiling joist question MattMM Framing and Foundation 2 10-30-2010 08:02 PM
Question on floor joist Alonzo Flooring 3 09-13-2010 07:59 PM