Ok - this is probably a stupid question but I figured I would ask it anyway as I do not know the answer.
I am building a cabin, the foundation is on peers and beams. The joists sit on top of the beams. I will put hardfoam board in the spaces between the joists and then fill with insulation. On top of that will go the floor. I had plans of putting 6mil plastic on top of the joists under the plywood floor. A friend asked if I was going to glue the floor down and I said no just nail it. But that got me to thinking - I could not use liquid nails if I had a vapor barrier there and since I know some people do use liquid nails, am I about to make a mistake?