I must admit the diamond-blade etcher is a recommendation I had not come across yet. Is there another name it goes by? I'm not finding much on the Home Depot rental site nor in my Google searches.
Based off your recommendation I have a few more questions to better understand...
In the pictures I posted you can see water from this rainstorm managed to go all the way back near the door that enters my home. Once I have the patio screened in I do not imagine the water making it this far into the patio (nearly 10-11 feet). However with a recommended .25" drop every 2-3 feet for water drainage. I am needing to trim about .75" off the outside perimeter to provide adequate water flow from that distance within the patio. Any concerns with structural integrity to the concrete etching off this amount? Not visible within my pictures the home builder did not add joints to my concrete patio when installed so I do have a hairline crack that runs a 5-6 feet across the patio.
In trying to visualize what the blade etcher will look like I imagine there will be some narrow spaces that cannot be etched. So my surface will not be entirely patio will not be level. Will this present any problems with uneven surfaces while installing the tile mastic and subsequently laying tile?
When I install the wood framing for my screened in porch I will need to consider any water that enters the patio will need to exit the patio by flowing past the framing into the lawn. Besides pressure treated lumber do you have any suggestions on how to minimize wood rot due to the water?
Also just to get your thoughts...another recommendation I had seen for the water drainage was to install fresh concrete over the existing. I would install at the appropriate drops every few feet to provide the necessary drainage. I also read up on installing a concrete overlay. I don't know much about the overlay option but wasn't sure if it made sense for my issue. Do you have any thoughts on these approaches.
I really appreciate your insight. Thanks!