Is Zip Wall Vapor Permeable

Are ZIP System sheathing panels a vapor barrier? No, the integrated protective overlay of a ZIP System wall sheathing panel is permeable to allow for drying to the outside.

Is Zip a vapor barrier?

Third party laboratory testing has shown that Zip has “vapor permeability of less than 1 perm, under both wet and dry cup measurement conditions.”** It appears that Zip can’t rid itself of moisture when it most needs to.

Is Zip better than OSB?

Much like AdvanTech, ZIP System has a higher price, also running about 50% higher than standard OSB, but with that figure not including the house wrap that is integral in the Zip System sheathing.