Insulating Rim Joist - 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!

Like Tree3Likes
  • 1 Post By CodeMatters
  • 2 Post By NotyeruncleBob
Reply
 
Thread Tools Search this Thread
Display Modes
Old 10-17-2017, 01:48 PM   #1
Newbie
 
Join Date: Oct 2017
Posts: 1
Rewards Points: 2
Default

Insulating Rim Joist


Our family has run out of room in our house, we have an unfinished basement that we are going to finish part of to use as an additional room. Some of the work I can do myself to save on cost, I was looking up finishing a basement and came across the suggestion to insulate the rim joist.

When I removed the bat insulation the attached picture is what I came across. My question is this: What should I do as far as insulating this? Fill the first cavity with rigid insulation, fill the entire cavity leaving a gap between the band and the insulation, or use it in the first cavity then use another piece to fill the second cavity.

Hope this make sense.
Attached Thumbnails
Insulating Rim Joist-img_1381.jpg  
jeduhi is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-17-2017, 02:37 PM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 26,054
Rewards Points: 906
Blog Entries: 41
Default

Re: Insulating Rim Joist


Seal the gaps and cracks with caulking.

Cut cobble rigid foam into the band area.

Seal the foam to the sides and seal the sill plate. Depending on the climate...2" may be required.

Insulated over the top with a fibrous (Roxul works well) insulation.
Windows on Wash is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-17-2017, 04:38 PM   #3
Member
 
Join Date: Nov 2015
Location: Maine
Posts: 10,682
Rewards Points: 166
Default

Re: Insulating Rim Joist


What's your climate region?
First question when considering finishing a basement is dealing with any water or humidity. How long have you lived there and have you had any water issues?

Do you have a sump pit and pump?

Draw up your plans and see what permits you will need and get to know your building officials.

Bud
Bud9051 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-17-2017, 05:41 PM   #4
Very Stable Genius
 
CodeMatters's Avatar
 
Join Date: Aug 2017
Location: Canada
Posts: 4,146
Rewards Points: 790
Default

Re: Insulating Rim Joist


Not my line of work so I'm certainly not the best to answer this question.
That said, I'm wondering if spray foam isn't the best and easiest for
irregular spaces?
Nealtw likes this.
CodeMatters is offline   Reply With Quote
Old 10-17-2017, 05:47 PM   #5
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 38,023
Rewards Points: 656
Default

Re: Insulating Rim Joist


Quote:
Originally Posted by CodeMatters View Post
Not my line of work so I'm certainly not the best to answer this question.
That said, I'm wondering if spray foam isn't the best and easiest for
irregular spaces?
With those truss joists, spray makes it easy, but anything you can get to fit properly will work. Depending on what type wall that need to be built against the foundation, fire stopping may be needed and planning for both jobs is a plus.
Nealtw is online now   Reply With Quote
Old 10-17-2017, 09:26 PM   #6
Member
 
Join Date: Mar 2017
Posts: 531
Rewards Points: 1,066
Default

Re: Insulating Rim Joist


Quote:
Originally Posted by CodeMatters View Post
I'm wondering if spray foam isn't the best and easiest for irregular spaces?
It can be, but it can also be expensive to get a crew out there to spray just that one area. Those DIY two part spray foam kits are questionable at best, so spray foam might not be the best solution in this case.
Getting a nozzle for the bigger Great Stuff type of cans will make the cut and cobble approach more achievable as a DIY project with good results. Just cut each foam block a little small and use the canned foam to seal it in place.
NotyeruncleBob is offline   Reply With Quote
Old 10-17-2017, 10:23 PM   #7
Member
 
jlhaslip's Avatar
 
Join Date: Dec 2009
Location: Edmonton, Alberta
Posts: 5,975
Rewards Points: 708
Default

Re: Insulating Rim Joist


Just a quick reminder to cover the foam (rigid or spray) with drywall as a fire protection.
__________________
Quote:
Short of cutting off a body part, the worst that can happen in woodworking is manufacturing really nice looking kindling. --- Quoted from lenaitch
jlhaslip 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
Floor Joist cm123 Building & Construction 2 11-08-2016 06:15 AM
Insulating Basement Wall - Sill Plate / Rim Joist maurzy01 Insulation 13 03-13-2015 11:33 PM
Rim joist insulating issue diyGK Insulation 19 01-12-2015 08:14 PM
Insulating Recessed Rim Joist matt151617 Insulation 4 09-03-2012 08:28 PM
Insulating rim joist bseries4life Insulation 5 04-01-2012 10:11 PM




Top of Page | View New Posts