I want to start building a recreation room and I have insulation with a barrier half way down, the wall, should I take this down. I see some people put some black paper product on the outside wall first. What is this and how do you fasten it to the wall. Do I put the insulation over top of this black stuff, than put plastic over the insulation? Do I hammer the insulation to the wall? And what kind of nails do I use. Poured basement. I want to do as much of the basement myself as possible to keep the cost down. Wood studs should they be 2x4's or 2x3's again to keep the cost down. I will be hiring someone to do most of the work but I would like to do as much as I can. Any assistance you can offer me would be appreciated.

joe123