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Metal roofing that uses battens or has a naturally occurring air space makes adding a radiant barrier very simple. The main goal is to get the foil down first, before the battens, then install the batten system on top of the foil and continue as normal.
The air gap that is created by the battens allows the foil to work as a radiant barrier that will use REFLECTIVITY to block heat coming off the roof from passing through the foil and in to the area below the foil. Your result is 97% of radiant heat is blocked and the structure (whether a home or a commercial building) is cooler inside.
With a batten system, the layering of the roof looks like this (coming from the roof down toward the interior of the building):
If the metal roof will be placed directly on top of framing, with no decking or battens, then the foil can be placed directly over the framing before the metal. You can use staples to attach the foil to the frame if it is wood. If it is a metal frame, both screws and double-sided adhesive tape work for holding the foil in place until the metal is attached.
Without a deck (and no battens), the layering of the roof looks like this (coming from the roof down toward the interior of the building):
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