I finishing a part of my basement and I want to put rigid insulation>studs>batt insulation in stud bay>drywall.
I have a wall that has copper pipes, pvc pipes, and gas pipes flush to the concrete wall. There is also a main clean out on the floor that's about 2 inches away from the concrete wall.
I'm thinking about moving the pipes off the concrete and putting rigid insulation on the wall. Then frame my wall in front of the main clean out.
Is it okay to have an air gap of about 4in from the rigid insulation to the studs? Also is there a better way to insulate this wall because it requires moving a lot pipes.