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Plywood or ZIP sheathing

user-1093575 | Posted in General Questions on

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.

Any opinions?

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  1. GBA Editor
    Martin Holladay | | #1

    Either approach will work. If you choose Zip System sheathing, you'll use Zip System tape, of course.

    If you choose plywood, I recommend that you tape the seams with 3M All Weather Flashing Tape, Siga Wigluv, or and Siga Sicrall. These three tapes all performed well on plywood in my backyard tape test.

  2. user-1093575 | | #2

    Thanks Martin. Much appreciated.

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