So the installer came at about noon today. We spent some time going over the existing deck and what work was to be done. If you missed it earlier, I am using the product from underdeckoasis. In the end, it seemed like the best kit for my particular deck. Plus if it leaks, they will fix it free of charge.
Today's work was entirely focused on installing flashing. You may only typically see flashing between your house and your deck to keep water from running directly between the two. The concept is the same. The concept of a deck drainage system is channeling water. Depending on what kind of ceiling you put in, the biggest problems are always the edges. Under my deck, they put flashing around all edges of the deck on the inside, between the joists and on the end beams. Pieces of flashing are usually bent using a "Break". This is not a tool the majority of homeowners will have or ever will buy. They cost about $1000+ or can be rented for about $100 a day.
Here are some pictures of installed flashing:
In this picture, you see many of the flashing pieces between the joists. The primary drainage gutter will be installed directly under them on the inside of the white beam.
On corners, two pieces of flashing usually overlap. You can also notice that all of the wiring I did is under the flashing, meaning that all water will be channeled over and around where I had wiring done. Even though all of the wiring used was meant to be used outdoors, keeping water out is always a bonus.
At this point I'd day about 75% of the flashing is done. Once that is finished he will be able to start installing the side/edge channels and gutter and finally the ceiling.