If drywall is installed with screws, drywall tape and joint compound alone, isn’t an air barrier created? Gaskets/adhesive seem logical wherever the continuity of drywall is interrupted (at the floor, rough openings, outlets, and partition walls), but what’s the function of putting it everywhere else? Why are wall boards glued to top plates and ceiling boards glued to rafters if the ceiling will then be taped with compound to the walls? Is this strictly a belt & suspenders approach? Or am I just not understanding how ADA works? I’ve read everything I could find on the subject.
These questions popped up when wondering how to deal with this:
In a balloon-framed rake wall with cathedral ceilings and no top plate at the ceiling plane, do I need to add solid blocking so the top of the wall sheets have something other than 24 inch o.c. studs to adhere to? Similarly, at the eaves (perpendicular to the rafters), is backing needed between rafters for the ceiling drywall edges?