Do I need vapour barrier when drywalling a kitchen ceiling?
If it is your attic above and vapor barrier does not exist then yes.
If it is a second floor room above, then no.
You can forego the plastic and use a vapor retarder (kraft-faced insulation or latex ceiling paint) in all other climates except hot-humid or hot-dry climates. ... All attics vented or unvented should have an air barrier (a properly detailed airtight drywall ceiling, for example) regardless of climate.
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