SGD leads into exterior patio and is actually on the outside of the opening thus inside the patio or outside of the house. I'd like to replace the SGD with prehung french doors that will sit within the opening. There are currently at least 2 layers of flooring that I will eventually demo & install new tile. What's best practice for High-Wind Hurricane Zone (HWHZ)? A) Install the new tile first then install the french doors on top of the new tile. B) Install the french doors to sub-floor and butt new tile up to french doors. Thanks!