my basement is dry.8ft ceilings so ideal for added room.right bow its not egress compliant.1 set of interior steps 7 32x16 windows.however half is drywalled and 2x4 drop ceiling.bottom 4x8 is moisture resistant rock.hung on 2x3 metal studs.i can access via drop ceiling.is there a blow in insulation i can ue beteween painted block and drywall.id prefer something that is no moisture risk.and safe vapor.