I have an unfinished basement where I've setup my wood shop. I'm finally ready to put up a partition wall to stop the dust from spreading and a closet around the DC to dull the noise a bit. I don't plan to put up any exterior walls and will leave the painted cinder block exposed. I've read when finishing a basement you should use 2" foam insulation against the cinder block before putting up studs and drywall but since I'm only putting the partition wall ends to the cinder block, I'm wondering whether I should put a 4" wide piece of 2" foam insulation against the cinder block and then studs/drywall or is the insulation really not needed?