This fall bathed in the finest autumn weather I can ever remember I tore down and rebuilt my screenhouse/deck. What I tore down was 23 years old and was built to unexacting standards, in other words it was terrible.
I did reuse the deck frame and the roof, but everything else was rebuilt.
I decided not to use treated lumber this time. I really hate the way it looks for one, and it is literally toxic. For the rebuilt screenhouse I used construction lumber which was then primed and painted (with the expensive stuff). For the decking itself I opted to use the "ultra deck" composite material.
I am in no mood to have to deal with refinishing ugly treated wood every few years. As everyone who has had a deck in this part of the country knows if you don't maintain the decking it begins to look like crap in a few short years. Traditionalists are never going to sanction this "fake" decking, but realists love it.
I opted for the white ultra deck which as it gets dirty it takes on the appearance of bleached out planks. The rest of the structure was painted to match the house itself. My goal was to make it look more or less as an extension of the house rather than a stand alone deck.
For now winter is just around the corner so I really won't get much pleasure out of it until next year, oh well...