Air barrier continuity at sheathing/top plate/ceiling transition – GreenBuildingAdvisor

Hi all,

Does anyone have advice on how to detail the air barrier at the transition from plywood sheathing to top-plate to ceiling (Intello membrane)?

I was planning to lay down an 18” strip of Siga majvest over the top plate to make this connection (I believe Josh Salinger has used this technique ). The problem I’m having is that my plywood sheathing will extend above the top plate to cover a 14” raised heel truss (without a panel joint landing on the top plate).  I’m wondering how I would connect the membrane strip to the middle of a sheathing panel.  Also, Siga majvest is crazy expensive, is there a cheaper alternative that is still vapor open and durable enough to stand up to dragging trusses over it?

Or perhaps there is a better way than a membrane altogether?

Thanks!

Adam