Have an existing patio and have been toying with various ideas - flagstone on top is the current leader, but had a question about concrete on top of the existing patio that would then be stamped and stained. The existing patio is free of cracks, so the main question that I have is how thick would the new concrete have to be?

Thanks for your input!

We have an old concrete patio that we're going to redo (one of these years) in the overlay, using a stone finish. We thought about putting a layer of decking on but the look doesn't match our yard and it's too thick. The overlay is not very thick -- I don't remember specs but I can't imagine it would be much thicker than flagstone. We only have a few inches clearance between our current patio and the door sill and that's plenty of room for the new surface.

I've seen samples of the product and it looks incredible, and care is supposed to be a dream. I'd be interested to hear if anyone has any bad experiences with this. See link for photos but I can assure you the finished product looks much better than the photos can show. In case you can't tell, I'm hooked on this idea :)