I am finishing my basement and so far have the stud work done. Part of the wall is covered with insulation which is now behind the studwork. The parts of the wall that are underground are not insulated. The house is 4 years old and the walls are poured concrete. Is it necessary to water proof the exposed wall before drywalling?
The best insulation to use below grade is 2" thick rigid foam. Waterproofing cement walls is a losing battle. Easier to keep water from getting to the wall from outside, by making sure grading runs away from the house, and gutters/downspouts are clear and working to do the same.