My parents have this vapor barrier on their crawl also. It is still damp. Their water pipes sweat a lot and i am guessing i need to stop that by putting insulator wrap on it. I made sure their TWO vents were open as one had plastic closing it. Not sure if that is right. I also made a screen door 2x3' instead of the plywood to help with air circulation. I just did that this fall and i put the plywood door up in the winter. They are located in northern michigan. Any other suggestions?