New answers tagged materials
Pressure treated are made for outdoor use and basically don't need to be painted to be protected from the elements. Otherwise when wood gets wet, rot sets in. Pressure treated wood is what you would see used as landscaping timbers, for example. As far as select vs furring goes, you're generally correct, but the more important part is the strength - select ...
Welded wire mesh, or woven wire mesh. Stucco netting also might do you. For supporting a stove chicken wire is probably fine also.
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