Crisp Architects Two walls should work just as well as long as attention is paid to drainage. In this case there is no walking surface or access to the deck above except through a window. Most of the time we do provide a door and walking surface above 'flat' roofs like this.

eissolf1 sunroom

Eli Green Design How are the railing posts framed in? If this was an accessible roof deck, would the posts be integral to the wall framing below? Thanks! Beautiful work!

Crisp Architects Yes, they are tied in and flashed

heathercobb In the case that the customer wants to access the top for entertaining, what kind of flooring is used on the outside and for the roof on the inside of the sunroom?