I want to build a combination covered porch with an open deck above in one corner of my house. It's kind of hard to describe exactly what I mean but I got the idea from a Drummond Design house. See the link. My question is, how should the flooring of the upper deck be constructed so that water runs off the deck and doesn't leak thru to the covered porch below.

I know I'll have to put a little bit of a slant on the deck floor and I'm thinking it will probably need to have a drain-pipe (like a shower drain) that leads over to something like a gutter downspout that runs down beside the porch. I will probably do an enclosed ceiling on the porch below so that the pipe is hidden. But, what kind of flooring/sub-flooring/waterproofing etc should I use on the deck level? I'd like to be able to put lights on the roof of the porch so waterproofing is absolutely necessary!

Thanks

http://www.drummonddesigns.com/plan/detail.html?planid=1001786