finishsed basement no XPS?
A family member built his own home and just did his basement. We are on a tight budget and want to finish a portion of our basement in some fashion; if only 3 exterior walls and a dropped ceiling....nothing fancy. We have lived in this 20 year old home over a year now and there has been no water issues. The prior owner claimed there never was. It does not get overly humid in the summer (we do have a dehumnidfier running)and the temp (except on a stretch of frigidly cold days) hovers around 58 degrees in the winter. We currently have no heat down there but I hope to add a few vents when I have the home's original heat pump replaced. The ceiling is open joist but is insulated with unfaced fiberglass bats. The walls are poured concrete as is the floor.
I was shying away from the whole thing due to cost but the kids are spending more and more time down there, its a bit chilly at times, it gets dusty and I do not like the idea of those exposed bats in the ceiling. The XPS (2"?) is quite expensive. The family member feels the XPS is overkill - he did not use it in his basement in his new home. He feels we should just drop down PT 2 X 4s on the floor (an inch from the walls to provide breathability) and stud it out and add fiberglass bat insulation--faced or unfaced---not sure. We could them add the dropped ceiling and drywall or panel.
What do you think? Do I need the XPS? Is the PT lunber at the base correct?