Walk-Out Basement Wall - Insulation - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 11-30-2011, 09:55 AM   #1
Member
 
Join Date: May 2008
Location: MA
Posts: 36
Rewards Points: 25
Default

Walk-Out Basement Wall


I have received a lot of help here on my basement project. But I have read many articles and discussion on how to insulate my walk-out basement and i am stuck

We have the entire back side of our basement wall (2x6 stud/sheathing)that we are trying to figure out the best way to insulate.
The other walls in the basement are concrete 8ft high with 2x4 studing inch away and a 2x6 stud wall to the garage which is already insulated with kraft faced insulation R19.

I was wondering if you could use the Extruded Polystyrene Foam boards on the outside wood basement walk out wall not concrete? Or should i use the unfaced batts or faced batts and dyrwall over?

Thanks for the help

Advertisement

ddave23 is offline   Reply With Quote
Old 11-30-2011, 10:58 AM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 7,107
Rewards Points: 3,270
Default

Walk-Out Basement Wall


I was thinking through the exact same question in my basement today while getting some tools put together.

The foam is best suited to be against the concrete wall. If you have a 1" gap, you should be able to slide it between the studs and get it against the wall.

Applying it to the interior stud wall will create a complete vapor barrier if it is the polyethylene skinned type of XPS.

The vapor barrier control of that board is most effectively placed directly against the interior concrete wall.

I may be misunderstanding your question so I apologize in advance if I did.

Advertisement

Windows on Wash is online now   Reply With Quote
Old 11-30-2011, 03:07 PM   #3
Member
 
Join Date: May 2011
Posts: 144
Rewards Points: 85
Default

Walk-Out Basement Wall


I used ROXUL on the wood,above grade side of my walkout basement.

Bonus is that ROXUL in 2X6 studs gives you R-23 vs R-19,and it is moisture and mold resistant.
spring3100 is offline   Reply With Quote
Old 12-19-2011, 09:59 AM   #4
Newbie
 
Join Date: Apr 2011
Posts: 19
Rewards Points: 10
Default

Walk-Out Basement Wall


question ; What did you guys do with the little concrete wall under the sliding door. Not sure what you call it but on my wlakout basement I have an 1-2 inches of concrete at thebase of my mostly insulated wall.

Do you use a small piece of rigid foam all along ther bottom?
fenders is offline   Reply With Quote
Old 12-20-2011, 09:01 AM   #5
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 7,107
Rewards Points: 3,270
Default

Walk-Out Basement Wall


Is the wall being framed out with 2x4/6's?

If not, I would leave it alone. People will invariably step on the foam and break it off it you don't have it protected with some sort of extension jamb.

It is not that big a thermal short circuit in the greater picture and there is alot more the basement that can take improvement first I would bet.
Windows on Wash is online now   Reply With Quote
Old 12-23-2011, 09:52 AM   #6
Member
 
Join Date: May 2008
Location: MA
Posts: 36
Rewards Points: 25
Default

Walk-Out Basement Wall


Quote:
Originally Posted by spring3100 View Post
I used ROXUL on the wood,above grade side of my walkout basement.

Bonus is that ROXUL in 2X6 studs gives you R-23 vs R-19,and it is moisture and mold resistant.
I have never used ROXUL before...do I need a vapor barrier on top of the ROXUL?
ddave23 is offline   Reply With Quote
Old 12-24-2011, 01:03 PM   #7
Member
 
Join Date: Apr 2008
Location: Rural northern NJ
Posts: 480
Rewards Points: 320
Default

Walk-Out Basement Wall


Quote:
Originally Posted by ddave23 View Post
I have never used ROXUL before...do I need a vapor barrier on top of the ROXUL?
Yes, on the inside:

http://www.roxul.com/residential/how+to+install+roxul

The insulation is porous and would allow warm, moisture-laden air from the interior to hit cold sheathing, creating a condensation problem.

Last edited by benjamincall; 12-24-2011 at 01:06 PM.
benjamincall is offline   Reply With Quote
Old 12-24-2011, 03:28 PM   #8
Registered User
 
Join Date: Mar 2009
Posts: 9,986
Rewards Points: 2,038
Default

Walk-Out Basement Wall


Foamboard outside is good to raise the dew point of the wall cavity to prevent condensation; http://www.buildingscience.com/docum...apor-retarders

http://www.greenbuildingadvisor.com/...foam-sheathing This way eliminates the plastic vapor barrier inside, reducing the Class required, if under the IRC; http://publicecodes.citation.com/ico...001_par004.htm

http://publicecodes.citation.com/ico...001_par005.htm
It also prevents thermal bridging of the wall studs/plates.

What will be the siding material?

Gary

Advertisement

__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need to Install Hand Rail on Basement Stairs, but on Concrete Wall Firehawk734 Building & Construction 40 01-18-2012 09:33 AM
Basement floor leaking after wall repair unfortunateluck Building & Construction 6 02-15-2011 07:05 PM
vapor barrier on basement pony wall hobbs in vanvouver Building & Construction 3 02-13-2011 09:07 AM
Finishing Basement Wall - Stairs Along Concrete Rob1976 General DIY Discussions 5 02-02-2011 09:39 AM
Best way to cover over brick wall in basement? tigereye Remodeling 4 04-14-2009 11:24 PM




Top of Page | View New Posts