A.Chris Rogers, technology manager at Huber Engineered Woods, the manufacturer of Zip System wall and roof sheathing, responds: With a sheet-type water-resistive barrier (like housewrap), any small hole can become an entry point for water, which can then spread to the area between the sheathing and the housewrap. This water has a direct path to the wall cavity through the gaps between the sheathing panels.

The Zip System panel has a phenol-impregnated kraft-paper overlay laminated to it; for water to get behind this moisture barrier, it would have to migrate around the nail head and flow down the shaft of the nail all the way through the panel.

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