About a month or so ago I had built an addition onto our house. It is sitting on a concrete grade beam on 20ft piles. I poked by head in the crawl space today and I noticed a fair amount of moisture on the insulation that is in the floor joist cavities. The moisture is generally around the edge of the addition close to the outside walls. The vapour barrier is between the insulation and the subfloor. I am guessing I am having some condensation issues as I live in Canada. To resolve the issue I am thinking of laying down some additional vapour barrier just on the ground and tacking it up along the grade beam walls. Any other suggestions?