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Typically both the air barrier and vapour barrier will be toward the inside of the house. Drywall, with additional Vapour Diffusion Retarder (VDR) paint, may act as a vapour retarder but not a vapour barrier.

• Where the drywall is interrupted - such as by partition walls and the header area - continue the airtightness process by sealing joints between the drywall and framing members, and between any framing members where air could move.
  
• Seals at joints between framing members, or drywall and framing members, are made with gaskets and sometimes caulking.
• It is critical to make the seal formed by the gaskets or caulking continuous and long lasting. Ensure that adjoining gaskets butt together or are caulked. Neoprene and synthetic rubber gaskets, or asphalt-impregnated foam gaskets work well.
• For large gaps, provide backing for caulking or use an appropriate foam caulking to create a seal. Choose caulk with long-term flexibility, such as silicone or acrylic latex that will adhere to the materials you need to seal.