Photos Sources: Summerhill

9.36.2.10. (16) Where a party wall meets the plane of airtightness, that junction shall be constructed airtight by sealing any voids within the party wall at the perimeter to the adjacent air barrier material and by

a) sealing all junctions between the structural components, or

b) covering the structural components with an air barrier material and sealing it to the adjacent air barrier material.