My builder last year screeded the front pathway for laying victorian tiles on. Weather got bad so he didn't return to finish it off and then got busy with other jobs. I'm thinking of doing it myself now. Some of the screed came out...you can see the patches. Can I tile directly onto this and fill out the patches with tile adhesive or is a special sand/cement mix required to level out before tiling on? If so what type sand and ratio? Also do I need to pva the pathway before tiling? Images show pathway now and tiles I intend to use.