Rigid air barrier options below scissor trusses?
Which of the following would be the best option for between T&G pine and bottom chord of scissor trusses? The house will be a simple ~1000 ft^2 cottage with a vented gable roof located in CZ4B mixed/dry.
1) Zip sheathing
Taped Zip sheathing will be used for the exterior walls as the primary air barrier. I doubt there will be many arguments in favor of Zip sheathing on the ceiling.
2) 1/4 in plywood
Would 1/4 in plywood make a durable air barrier above T&G pine? Would the Zip system tape adhere as well to plywood as to Zip sheathing?
My concern with drywall is that the ceiling air barrier needs to be installed for the initial blower door test, prior to wall insulation and drywall installation.
Are there other options?
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