Replies

1. 
   DickRussell | May 31, 2008 06:32pm | #1

   R of concrete can vary, but the number I've most often seen used is 0.08 per inch. So your 10" would give about 0.8 total. It's so little that the uncertainty in R of concrete is of little importance.

1. 
   jrieds | May 31, 2008 06:35pm | #2

   Thanks for the info.
   I guess I'll have to insulate the wall in the basement, up here in Wisconsin.
   I was thinking of just building a 2x4 wall and putting fiberglass batts in the cavities. Should I use the kraftpaper backed batts?

1. 
   BillHartmann | May 31, 2008 07:01pm | #3

   None of the above.The best system is 2" of XPS sheet sealed to the walls. That provides both insulation and vapor retarder.Then you can either use furring strips or build a stud wall infront of it. You can get some foam panels setup with slots for furing strips.And since it is now structural you can built a 2x3 wood stud wall or 1 5/8" steel stud wall if space is critical..
   .
   A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.

1. 
   peteshlagor | May 31, 2008 10:16pm | #6

   Which type of spray foam would be best in this case - if it were to be done?  Open or closed?

1. 
   BillHartmann | May 31, 2008 10:40pm | #7

   I really don't know.First you don't need that much insulation in a basement and it is already well sealed.So I don't thing tht spray is worth unless you allready have walls up that you don't wnat to remove..
   .
   A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.

2. 
   nuvue94 | Jun 01, 2008 03:45am | #8

   Hey
   We learned that concrete really isn't a insulator at all, it is a good conductor tho.
   Supposedly heat travels thru it about an inch an hour. (If it was a solar wall with sun 6-8 hrs a day)

2. 
   brownbagg | May 31, 2008 07:45pm | #4

   the wall is zero but it will retain heat and then offgas the heat so the factor of R is useless. if you was where it was laways cold the wall be cold. but if you have heated day and cold night it would retain het from day and retain cold from night. My walls stay 72 degrees all year round
1. 
   peteshlagor | May 31, 2008 10:14pm | #5

   "My walls stay 72 degrees all year round"

   All of us Northerners hope the termites carry you away!