My house has a two level deck - one is a walk out from the basement level, the other a walkout from the kitchen/living room area. Each deck is 32 feet wide by 16 feet deep (512 sq ft.) So last year I replaced all my decking on the top level and went with some mid level Trex. Also replaced all the railings on the top deck, as well as completely redid the staircase between the two levels. Before putting down the new decking, though, I installed a water barrier, called
Trex rain escape. Any rain or snow that falls on the top deck will be funneled down into a gutter system, so the lower deck will remain dry.
I want to turn that lower deck into an "outdoor living room". Currently when you're down there and look up you see the rain system over top of the joists (just like the 5th picture in the above link). I want to install some can lights (I imagine would need to be low clearance and low heat leds), two ceiling fans, and a bead board ceiling. As the ceiling won't get any direct water, it will still be "outside" so I'm not sure of the proper material to use. Would any
wood "ply-bead paneling" work (obviously painted up well on both sides and around the edges), or should I go for something a bit more suited for "exterior use"?