Plywood or ZIP sheathing
Our wall assembly will be 2×6 framed wall with cellulose, sheathing (ZIP or plywood), 2″ foil faced polyiso (2 – 1″ layers), furring, then hardiplank.
My first thought was to use the Zip sheathing for the the air barrier properties but now thinking I can get the same effect with taped seams of plywood.
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