What orientation should a foil surface insulation blanket face under a metal roof?

What orientation should a foil surface insulation blanket face under a metal roof?

In most cases, the shiny side should be facing up. Foil insulation is a radiant barrier, and it works by reflecting heat from the metal, but for it to do its job, there must be a layer of air between the roofing and the foil.
Some types of metal roofing are shaped to create this air space, but if you're installing a type that doesn't, you should construct a batten structure. The foil then goes under the battens.
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