I am planning on finishing a room in the basement of my 49 year old home in the twin cities. My plan was to use 2x2 furring strips 16” on center with rigid foam insulation in between the furring strips. Also planning on building regular 2x4 walls for interior walls. I’ve never had a water problem in the basement, which is concrete block. Is it correct that I need to cover the furring strips and insulation with a vapor barrier? I’m also wondering what is the best way to attach the sill plate of the 2x4 walls to the floor. My brother told me to forget screws because it takes way to many drill bits to get the job done. Is something like liquid nails strong enough considering the top of the wall will be nailed to the bottom of the 1st floor joists? If not, what would be a good solution? Any comments or suggestions would be appreciated since this is my first project of this magnitude.

 

Tim: This is what I would do. Concrete wall, vapor barrier, then 2x4 walls with rolled insulation between them. I would forget the 2x2's and the foam. Waste of money. Now to hold your wall. I would frame in my wall laying flat on the floor,
then tilt it up, wedge it into place (in otherwords, slide it up top first under your floor joists, and hammer the bottom in. This puts your wall in tension. Attach to the top of the wall to the bottom of your floor joists, then go along starting with a corner and put in a concrete expansion bolt about every 5 or 6 feet. One thing to remember, when you build your wall. If you floor to bottom of joist height is 7' lets say, then your total wall height is to be build 6' 11 3/4" tall. If it is too tall, you won't be able to get it in. Then put oak shims on the top under the floor joists. Good Luck
There is very little R value in foam.

 

Thanks for the advice Jack.