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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I used annealed copper flashing strips (~4" wide) to top the joists on a deck I built 20 years ago.
Each over-hanging side is folded down maybe 15-30 degrees. This keeps the joists very dry. Whereas any of the wrapped solutions have water running down the joist sides, and clinging.
I've been very happy with my solution. It's aged well.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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