re: Followup questions on wall repair

Barb, the plastic lining on the inside is a vapor barrier. Since you’re in cold weather country, you want the vapor barrier between the warm heat (inside) and in the insulation. That keeps moisture from migrating from inside into the insulation. From inside out, it would be something like: wall board/gypsum->vapor barrier->insulation->exterior shear->tyvek house wrap (to keep outside water off the wooden exterior shear)->exterior metal cladding. 

Hope that makes sense! Overlap all the barriers by a min of 6 inches.