I would like to cover an existing concrete floor (floor has a vapor barrior that was cut thru in places for plumbing work). I was going to use white wood 2 x 2 sleepers attached with tapcon fasters (shimmed as necessary) and 3/4 t & g plywood. what should I do about a vapor barrior and insulation? I dont want to create a moisture problem by adding a second vapor barrior even thou the first is no longer a solid piece. Could I use fiberglass insulation?