How do I insulate a building that is a pole barn covered with sheet metal or a sheet metal storage building?
You can spray the insulation directly on the steel assuming that you are using damp spray and not loose fill insulation. Of course, it would not stick if it were not damp spray. If you are framing using 2×4 studs, you would insulate just like a conventional home. You may also spray it on the ceiling. As an example, dip a paper napkin in a glass of water and throw it on a smooth wall. It will stay there for 50 years if left undisturbed. Same concept.
