I have some old Miraflex Insulation on the attic floor with a pink permeable covering facing the roof deck, and an impermeable layer facing the attic floor.

Should I remove the impermeable layer closest to the attic floor before filling in gaps between joists and adding another layer of unfaced insulation? I will make sure I air seal well. 

This is not a finished space, roof is vented, and I live in Southern Ontario. 

Thanks in advance!