Due to water damage in basement, the drywall, vapor barrier and insulation was removed 3 feet up from carpet. During re-build we need to attach new plastic vapor barrier to existing plastic which is still under existing drywall.
Question: To attach new vapor barrier, should the old barrier have been left hanging below drywall to tape to the new plastic? Or is it better to cut both drywall and plastic barrier flush with each other, then slide new plastic under drywall to tape together?
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