My basement wall is adjacent to a filled foundation. Is there any point in insulating?
The concrete provides almost no insulating valve. Walls 3 feet below grade are usually figured as being about 55 degrees all year long. Above that 3 feet line they are usually considered to be outside exposed walls. When I finished my basement (near Pittsburgh, Pa.) I insulated all the walls with 1" styrofoam (pink board) and studs. It worked for me