Insulate basement wall or in frame?


Old 05-22-13, 07:03 AM
Thread Starter
Join Date: May 2013
Location: United States
Posts: 6
Insulate basement wall or in frame?

I'm doing some research but reading in circles, can anyone help?

I've read a lot of posts and obviously everyone is in a different location and home construction. I'm in Northern NJ. My basement wall is pictured, it has a waterproofing membrane on the block that runs into a weeping drain system into a sump pump.

I'm going to frame the wall up against this membrane. Can I use Roxul in the frame and leave the concrete wall as is?

And/Or I spray foam the rim joist to seal them Or maybe the Rim joist and block down to the membrane?

Does anyone have an opinion on that?
Sponsored Links
Old 05-22-13, 07:11 AM
Thread Starter
Join Date: May 2013
Location: United States
Posts: 6
The attachment failed. Here is the picture-
Attached Images  
Old 05-28-13, 03:52 PM
Join Date: Mar 2013
Location: USA
Posts: 457
Hello, are you still around?

Find your Zone, either 4 or 5; Chapter 11 - Energy Efficiency

Find basement insulation requirement, read footnote "c"; Chapter 11 - Energy Efficiency

Frame a wood wall on 1" XPS (prevent thermal/air/capillary wicking) after gluing 1" XPS to the concrete and membrane plastic (that would transfer CMU temps across them); IRC FAQ: Insulating Sheathing Vapor Retarder Requirements — Building Science Information

Pressure-Treated Sill Plates and the Building Code |

You could also skip the f.b. on the membrane as it is below grade (IMHO- not me) and temps are colder above ground and 3' below to warrant it. Figs. 26, 27;

Use (3-1/2") Roxul in a 2x4 wall with 5-1/2" Roxul to fill cavity above the membrane; touching the f.b.- no air gaps;

XPS and canned foam the rim;

ADA the drywall; Info-401: Air Barriers


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

Thread Tools
Search this Thread
Display Modes