I'm building a relatively large but low to the ground (12"-18") deck that will extend beyond an existing concrete patio in every direction. My design will require three posts where the patio sits, so I am concerned with how to deal with that. The rest of my post holes will be 18" deep. Most people feel comfortable with just telling me to bolt the posts directly to the patio but I'm still not sure. I doubt that the patio is more than 4" thick so it could float over time. I've considered building a floating deck, but I'd rather attach it to the house.
What is the best way of dealing with this? The last thing I would like to do is tear up the patio. For what's it's worth, I live in Raleigh, NC.