• If an interior floor extends through the envelope to become an exterior floor the air barrier continuity must be maintained
• Air barrier continuity is to be maintained by being continuous with or sealed to adjacent air barrier systems

9.25.3.3.(6) Where an interior floor projects through an exterior wall or extends to become an exterior floor, continuity of the air barrier system shall be maintained from the abutting walls across the floor assembly.

9.25.3.3.(7) Where an interior floor projects through an exterior wall to become an exterior floor,

(a) the air barrier of the wall under the floor shall be continuous with or sealed to the subfloor or the air barrier on the underside of the floor,

(b) the air barrier of the wall above the floor shall be continuous with or sealed to the subfloor or the air barrier on the top of the floor, and

(c) the spaces between floor joists shall be blocked and sealed.