Plumbing Freeze Protection in Exterior Wall – GreenBuildingAdvisor

Just failed my rough plumbing inspection for water lines in an exterior wall in the garage.  The garage is framed 2×6 with Zip sheathing on the outside.  We are in climate zone 5 and the garage floor has hydronic/radiant heat.

The inspector cited IRC P2603.5 and suggested bringing the pipes out to the face of the 2×6, framing essentially a double wall.  My biggest issue is that he was not specific in any of this.  He mentioned no measured distance from the sheathing, R-value for insulation, etc.  It was very arbitrary, although I understand his concern.  He also called out the frost free hose bib I had installed as too short, but again without any specific length/requirement.

My issue is making sure that whatever I do to address this is both a solution that I am happy with, and one that the inspector will find acceptable after putting in all the effort to redo this.

The wall has an internal hot/cold hose bib, a sink, a shower for the dogs, and an exterior hose bib.