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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 designed and built a similar 'pan' system as desribed iun the popular mech article. Tho, in my design, the pans are stainless steel with a bent-up flange (this provides for nailing/screwing to the joists). THe other key part is copper flashing, placed along the top of the joist, to give cover to the joist-pan contact. ~10years, still going.
The downside to my approach, is that implementation needs to happen before the deck-boards go down. --it appears that the system in the article is designed to go on existing decks.
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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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