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Let's face it, many contractors simply don't like polyethylene vapor retarders. Drywallers don't because it prevents gluing wallboard to studs. Electricians and plumbers dislike poly because it gets in the way. And many builders are wary because it may cause moisture problems in ceilings. Though required by code in many jurisdictions, poly vapor retarders often get slashed or never get installed in the first place. The good news is that you really don't need to use poly as long as you use drywall, carefully taped and gasketed (or other suitable materials), to form an air barrier. In fact, there are at least three practical alternatives to polyethylene vapor retarders. These are not compromise alternatives. Each one can provide an effective