concrete stub wall
 

I am going to finish my basement and I had one last question before I begin. My basement is nothing but concrete walls. It is an old foundation. The west floor cracked and the west wall begin to lean. I have resovled that issue. My point is that the west floor is not even, not to mention other slopes around the basement. So I am going to pour a stub wall around the perimter of the basement. Wide enough to get a pretreated 2by4 to lay down on it and a 2 inch rigid foam behind it. so, five and a half inch wide perimeter by about an inch and a half tall to two inches. The middle concrete stub wall will only be an inch and a half wide. I will laser level the forms to get it on the money. And then lay floor joist on top like a regular build. Now my question is, should I put a vapor barrier below the concrete stub wall and on the perimeter of the stub wall matching the height. If so what type of vapor barrier? Thanks for any input.

Daltinator
 

I agree. Imagining a 1 to 2 inch height is pretty short. Here is my correction. I am going to lay down a 2by6 pretreated wood,leave a inch gap between wall and foam, and install a 2 inch piece of foam. Then I will make the height six inches to add to the whole mass. So that will leave me with a 8.5" width by 6" height stub wall. Then I will drill holes in floor, put some vertical rebar and epoxy in holes, and tie down a horizontal piece of rebar to attach all. That is going to be a very solid. I still am wondering if I should put down a vapor barrier before pouring the stub wall?