My den area is under a crawlspace. There was never any insulation installed under the floor. The crawl space has a scratch coat of cement on the floor. But what was done was that a vapor barrier was stapled to the bottom of the subfloor, apparently prior to putting down the subfloor since it runs right on top of the floor joists also. I've seem to remember hearing this is not a good situation. Should I cut this away before I install the insulation or can a just leave it in place and install the insulation over it? Even if a cut it away, I'm not sure if I could get it out from under the joist. Thanks