Rim Board Insulation Help - 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 Tree1Likes
  • 1 Post By APA
Reply
 
Thread Tools Search this Thread
Display Modes
Old 09-16-2020, 09:02 AM   #1
Newbie
 
Join Date: Aug 2020
Posts: 4
Default

Rim board insulation help


Built new home few years back in Northern Ontario and used "TouchnFoam" spray foam insulation to seal and insulate rim board. Bexause of temperature of rim board and possibly temperature in basement at the time, seems the foam a)did not adhere (and so vapour seal) properly nor expand (and so insulate properly). Discovering this, I now propose to use "Great Stuff" to seal all cavities and better vapour seal and akso build up foam insulation where required. Will also add some more bat insulation to augment insulation. I realize Great Stuff in spray can is expensive but this srill seems most cost effective remedy. Anyone have any concerns at this approach as to its effectiveness as a viable solution to assure vapour barrier is good and insulation is maximized? Thanks for any help including cautions if needed.
rod580sl is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-16-2020, 09:40 AM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 26,072
Rewards Points: 944
Blog Entries: 41
Default

Re: Rim board insulation help


Did you picture box it with foam?
Windows on Wash is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-16-2020, 09:45 AM   #3
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 38,128
Rewards Points: 866
Default

Re: Rim board insulation help


Foam should be behind something fire resistant.
__________________
Do not use flat bottom gables with scissor trusses.
https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
Nealtw is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-16-2020, 10:17 AM   #4
Member
 
Join Date: Nov 2015
Location: Maine
Posts: 10,728
Rewards Points: 258
Default

Re: Rim board insulation help


My preference would be to leave what is there maybe caulk around the perimeter with regular caulking, Then a layer of 3.5" roxul covered by a foil faced rigid foam board and more perimeter caulking.

Exposed fiberglass makes for nice mouse nests.

Bud
__________________
I volunteer my help and opinions, but you are responsible for what YOU choose to do with that information.
Bud9051 is online now   Reply With Quote
Old 09-16-2020, 07:26 PM   #5
Newbie
 
Join Date: Aug 2020
Posts: 4
Default


Thanks to all.
To get occupancy when using foam it was necessary to intal Roxul insulation.
What I am now doing before I drywall ceiling, is to ensure vapour barrier need is met and good insulation in place. The thinking in using great stuff to fill any voids is to deal with vapour barrier need tgat will then be coupled/enhanced with Roxul. In hindsight, lots could have been done differently/better but do you folks concur what I am proposing will do the job?
rod580sl is offline   Reply With Quote
Old 09-16-2020, 08:41 PM   #6
Member
 
Join Date: Oct 2008
Location: Ontario
Posts: 6,289
Rewards Points: 11,492
Default

Re: Rim board insulation help


I don't see a reason why it wouldn't work, but every time I use that stuff, I have made a mess. Sometimes difficult to get adhesion because it does not really "spray" out with velocity, just kinda oozes out. If you have a quarter inch gap to let it expand into, should be good. If you have a 1mm gap and need to spray over top, I can see that being a lot more difficult. You may wish to try one can.
SPS-1 is online now   Reply With Quote
Old 09-16-2020, 09:32 PM   #7
Newbie
 
Join Date: Aug 2020
Posts: 4
Default


Thanks for reply. Not that it matters but what part of Ontario are you from SDS?
rod580sl is offline   Reply With Quote
Old 09-16-2020, 09:32 PM   #8
Newbie
 
Join Date: Aug 2020
Posts: 4
Default


Sorry, SPS.
rod580sl is offline   Reply With Quote
Old 09-16-2020, 10:31 PM   #9
APA
Member
 
Join Date: Jul 2018
Posts: 193
Rewards Points: 384
Default

Re: Rim board insulation help


Quote:
Originally Posted by Nealtw View Post
Foam should be behind something fire resistant.

I get it, but if your rim joist is on fire the house is lost anyway...
Fix'n it likes this.
APA is offline   Reply With Quote
Old 09-16-2020, 10:34 PM   #10
Member
 
Join Date: Dec 2019
Location: Coastal British Columbia, Canada
Posts: 606
Rewards Points: 1,210
Default

Re: Rim board insulation help


I recently finished doing this job on my 1992 vintage house. The builder had tried to air seal each joist bay with polyethylene and acoustic sealant, but there were many gaps. Since the joist bays are mostly all the same size a bunch of pieces can be cut quickly then screwed in place with one long screw through the centre to hold it in place. Leave at least ĹĒ space around the sides and top to make it easy to get the foam tube in. Using the rigid foam in every bay means you donít have to evaluate where the spray foam worked properly and where it didnít.

There were two cavities where I couldnít get a piece of rigid foam into, so I basically tried to cover the entire exposed surface with canned foam. That didnít work nearly as well. Hard to get consistent coverage. Sometimes the foam seemed like it was going to fall off. It really works a lot better when it is filling a three sided void.

https://www.finehomebuilding.com/201...20spray%20foam.

When Iím using canned foam, especially in a location like this I throw away the 6Ē plastic tube that they give you and use 18Ē of flexible plastic tubing with the tip taped to something thin and solid, like a skewer from my wifeís kitchen. Then one hand can squeeze the nozzle to control the flow of foam and the other can direct the tube where the foam needs to go.

Chris
Chris616 is offline   Reply With Quote
Old 09-16-2020, 10:40 PM   #11
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 38,128
Rewards Points: 866
Default

Re: Rim board insulation help


Quote:
Originally Posted by APA View Post
I get it, but if your rim joist is on fire the house is lost anyway...
I think it about the gasses that come off burning foam that kill people,
__________________
Do not use flat bottom gables with scissor trusses.
https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
Nealtw is offline   Reply With Quote
Old 09-17-2020, 01:31 AM   #12
Newbie
 
Join Date: Sep 2020
Location: Portland, Oregon
Posts: 8
Rewards Points: 16
Default

Re: Rim board insulation help


This is my first post, and I'm about to insulate my rim joists and sill plate as well! Since this thread is already active, may I ask a relevant question:

What are the pros and cons of Great Stuff vs caulking around the foam board? Expanding foam has a tendency to look sloppy, so I'm leaning towards buying an inexpensive dispenser gun on Amazon so I can control the foam better. In this case, which Great Stuff is more appropriate: gaps/cracks or window/doors?

Last edited by jpdx; 09-17-2020 at 01:38 AM.
jpdx is offline   Reply With Quote
Old 09-17-2020, 06:09 AM   #13
Member
 
Join Date: Oct 2008
Location: Ontario
Posts: 6,289
Rewards Points: 11,492
Default

Re: Rim board insulation help


Quote:
Originally Posted by jpdx View Post
What are the pros and cons of Great Stuff vs caulking around the foam board?
You should really start a new thread. Or go to "search" -- this subject has been discussed many times.

But to answer your question, the disadvantage of Great Stuff is that it makes a mess. I used XPS and caulked. XPS cuts cleaner and better insulates. Yes, it is more expensive. I used cheap acrylic window/door caulk.
SPS-1 is online now   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





Top of Page | View New Posts