no insulation vs. plastic insulation?
I'm going to put 2" XPS on my perimeter walls. I was going to frame and sheetrock without any additional insulation between the studs.
Are there any sound issues with not filling the studs with insulation at the perimeter wall (ie, cinder block foundation walls)? We're just using the basement for the children's playroom. Maybe later, we might convert a portion of it into a media room.
Someone told me about plastic insulation that has no paper backing and therefore won't itself provide a food source for mold. Any comments/insight on this type of insulation?