We just bought a home built in the early 70's. We were replacing some of the subfloor prior to getting new carpet and discovered the vapor barrier thick plastic is sandwiched between the lower and upper sub floors. Is this ok. The house seems to hold odors and I didn't know if this was an acceptable construction practice or cause for concern ? The laundry room is in the center of the house and there was appearantly a leak at one point. We believe that the plastic held the water in and kept it against the top layer of subfloor which is why we replaced it. It still seemed solid but it was water stained and we were trying to eliminate any possible odor producing culprits. We suspect the plastic is all throughout but we didn't tear up all the sub floor so arent sure.Our utility bills are very reasonable so we think the sandwich of plastic is making the house air tight good on utilities but bad on odor. Got any insight that might be helpful ? Thanks so much.