We have a 100 year old camp in humid Northeast that is closed for the winter. We just replaced the floor joists and subfloor and put a 6 mil vapor barrier on the dirt in the minimally ventilated crawlspace (2-3 feet), but it can't be sealed to the stone foundation and there will still be a lot of moisture beneath the floor. The floor is un-insulated. Can we put down a second vapor barrier between the subfloor and floor without creating moisture issues? Each side can dry away from the barrier so it seems that there should not be a problem, but the crawlspace vents will be closed in the winter. All expertise apprecaited.