I hired a company to insulate the garage I just built because surprisingly it was just a hundred or so dollars more to have someone else to it... They put in R-19 unfaced insulation and then covered it all with plastic. A couple weeks later I noticed frost on the inside of the plastic cover, now that spring is here that frost is turning to water and getting in the insulation. I talked to a couple of people and they are all telling me different things.... Any suggestions???