Practical way to air seal an interior soffit with Airtight Drywall?
I’m planning on using the Airtight Drywall Approach for my ceiling plane, but have a few interior soffits planned (for example a drop from the 9′ ceiling to the top of the kitchen cabinets). I’m assuming that with ADA, it would be best to not leave the top of the soffit area open but rather keep the air barrier at the same level (right below the roof trusses)?
So what is a good practical way of doing this? Would one install drywall on the top of the soffit (level with the main ceiling plane) and tape it with drywall tape, and then drywall the rest of the soffit? Or use something like OSB on the top of the soffit and use a good tape from the attic side to connect that to the adjacent ceiling drywall? Or a different method? Thanks.
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