Sliding Glass Door onto Deck - water leakage
We are located in CA near the coast as well and always use door pans even on the leeward sides of our homes.
That is what I was thinking as well. Do you have some idea about how much that might cost? It is true that however, put this darn door in, did not use proper flashing. Same with our other bedroom sliding glass door. The door sits almost flush with the deck - well, it has about an inch riser.
You can pick a roll of that up at your local (84) lumber yard & it has a sticky back and when nails permiate it, it seals around the nail... but it needs to be installed properly.
The one inch drop to the deck is a good thing, you don't want any less than that.
Not that the ones installed need that right away..