<p>Hey Gimo...I could be wrong and I hope someone speaks up if I am, but if you haven't put down your plywood on the floor yet, you may want to lay some 1 x 2 slats of lumber and then put hardboard insulation on the floor, cover with a barrier then put the the plywood. What I did in my cabin, I laid felt paper (what they use on roofs before laying shingles) then the flooring. This is what I had in mind when doing the floor. I hope someone can let you know if its the right way...its just an idea. </p>