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Weather barriers vs. vapor barriers

Question

Weather barriers (aka air barriers) differ from vapor barriers in that:

  1. Weather barriers are breathable and go on the outside of wall sheathing, while vapor barriers are not permeable and go on the interior side of wall insulation.
  2. Weather barriers are not breathable and go on the outside of wall sheathing, while vapor barriers are permeable and go on the interior side of wall insulation.
  3. Weather barriers are breathable and go on the interior of wall insulation, while vapor barriers are not permeable and go on the outside of wall sheathing.
  4. Weather barriers are not breathable and go on the interior side of wall insulation, while vapor barriers are permeable and go on the outside of wall sheathing.