....ah...yes and no......insulate between the studs and between the face of the stud and the INSIDE wall......another words: air-outside skin-insulation/filling the void-then a inside board type insulation [should be 1/2 to 3/4 inch thick] that covers the stud faces-the interior wall WITH A VAPOR BARRIER-finally, inside air.... Where the manufactures mess up is the wall stud is connected to outside skin and directly to the interior wall covering which makes a path for the cold or heat to penetrate the interior conditioned space and they generally leave out the vapor barrier-which can be a coat of enamel paint on all sides of the interior covering or a layer of 3 mil plastic sheeting taped around all seams or adhered to the back of the wall covering. I prefer an interior wall panel that is painted with enamel-faces as well as edges-to completely seal the panel of wood,composite or laminate and a polyisocynate spray foam or panel for insulation. In the RV industry one will see seams that are darker because of accumulation of dirt and moisture. And there is the problem of moisture and mold in an RV.......geofkaye
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