Top plate vs. 1 x 3
I’ve spent hours reading and cannot find the answer to this simply question. How broad is the definition of a top plate? For example in my attic there are top plates at the top of interior and exterior walls. I’m wondering if air sealing also needs to be done where the drywall is nailed to 1 x 3’s? Are these 1 x 3 drywall supports also called top plates?
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