I have a crawl space that is approx 15x20. Currently the insulation is exposed in the above beams and is starting to hang down. Looks like cotton candy..for lack of better terms...and I wanted to replace it. I was wondering if there was a way to keep that from happening. The space is not heated of course and the is plenty of ventilation. I was thinking a thick plastic staples up to the beams to hold it there and possibly sealing off the above cavities...and proper textbook way to insulate in between the beams and keeping it from having sagging fibers...thanks in advance for the help.....