GRK Fasteners with Zip-R Sheathing
I am sheathing a 26×14 porch addition with 2″ xps under zip system. Lead times on Zip-R were prohibitive and I could not source polyiso locally.
Zip suggests that fasteners penetrate the framing 1.5,” which means I need a 4″ fastener. I don’t have a nailer that will shoot a 4″ nail. So, because the project isnt huge, I intended to hand-drive 20D galvy nails.
What I have found is the heads of the nails will not flush-up with the zip panels, because the force required to do so will compress the foam rather than sink the large nail heads into the panels. This isnt an issue in the middle of my panels, but is a problem at the edges (3″ fastener spacing) because it leaves proud nail heads which will reduce the efficacy of the zip tape.
Long story short, Zip does not officially endorse GRKs. Practically, do you all think I could use a 4″ GRK R4 countersink in this application without concern?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part