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Vapor Barriers for Wood

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When an untreated wood beam frames into a pocket in a concrete or masonry wall, the codes require some type of protection.  Typically, I have seen a treated sill with an air gap around the beam or some type of vapor barrier.
Does anyone have some good industry recommendations?  What is an acceptable vapor barrier (metal, builder's felt, termite shields, etc)?  What about wrapping the end of the beam in aluminum trim and leaving no air gaps?