We have a small 9' x 9' concrete back patio that has a drain in the center (see pic). The cement is angled towards the drain, so when it rains there actually isn't too much water build up, which is great.
We're thinking about adding tile to the patio to make it a little more personable and 'nicer', but are not really sure how to deal with the drain and the angled concrete. Are there resources out there showing how to diy tile over angled concrete with a drain? Do we need to level things out first, but if so, how do we prevent water build up? Should I put down a water impermeable layer first?