Zero Cottage: San Francisco's First Net Zero Passive House

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In preparation for adding the final layer of exterior finish material we screwed cedar battens through the 2” layer of foam into the plywood sheathing.  The theory is that the Grace Perm-A-Barrier water/vapor barrier will stop any moisture from getting through to the plywood.  The battens serve a couple of purposes: they provide a robust 3/4” vented space so any water outside of the waterproofing barrier can dry out.  Also the foam is very weak in compression so aligning the clips for the metal rainscreen would be difficult.

  1. zerocottage posted this