I'm a homeowner who had a paver patio installed by a "pro" 4 years ago. It's always looked horrible. Uneven after compaction since day 1. I had him come back and try to fix it. He re-compacted without laying sand and the compactor put long white scratches all over the patio. I complained again and he left me a nasty voicemail with the F-bomb. I cut my losses and moved on. Now I'd like to cover the entire thing with flagstone. The base of my patio is every strong. 10-12 inches of crushed-modified, 1-2 inches of concrete sand. The finish work was poor, not the foundation. I'm thinking of using another 1 inch of sand on top of the pavers and laying the flags on it. OR I could do another 2-3 inches of crushed-mod and laying the flags directly over that. Thoughts? I don't belive I would have drainage issues... Thanks.