quicksandfarmer
Veteran Member
One other thing to consider if this work is going to be inspected -- my local code now requires even a detached garage to have a fire-rated interior (i.e. taped drywall). Wood over drywall is OK.
What about steel ? The type used as roofing but installed horizontally over your studs.
Generally available in about a dozen colors. fireproof, waterproof (you can wash indoors). I have seen many shops around here using this.