Additional WRB Over Zip Sheathing
I’m finally in the midst of framing and using the ZipSystem for sheathing. I had not planned on putting on an additional WRB layer, but a few of the framing guys suggested it and I also read this earlier GBA thread that suggests it’s recommended (https://www.greenbuildingadvisor.com/question/would-it-be-ok-to-put-housewrap-over-zip-sheathing-due-to-high-winds-and-rain-at-the-beach).
Huber doesn’t exactly recommend it and in a few instances, it can actually void the warranty as is with the case with peel and stick WRB (https://www.huberwood.com/uploads/documents/technical/documents/Housewrap-over-ZIP-System-sheathing-Tech-Tip-Wall-ZIP-System_2021-08-03-194820_dijx.pdf).
In my construction, I’m putting on two inch polyiso on top of the Zip sheathing with the rain screen on top of the polyiso and then Hemlock cladding, which at this moment I intend to treat with pine tar.
What are folks out there doing with respect to a second WRB in addition to Zip sheathing in situations that don’t involve stucco or other scenarios where a second WRB is absolutely required?
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