My roofer says he wants to use foiled back decking on my re-roofing job (we have to tear off old wood shingles and add new decking.) Any comments on whether such decking is helpful, harmful or no difference?
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Here is an opinion, it's not commonly used in my area, Northeast. There has always been doubts about reflective barriers without any space.
http://www.radiantbarrierguru.com/radiant-barrier-under-shingles/
Radiant barrier sheathing like you're talking about can be useful in reducing attic heat. I don't know a downside to using it.